Piyush Sabharwall

Profile Information
Name
Piyush Sabharwall
Institution
Idaho National Laboratory
Position
Research Staff Scientist / Adv Heat Transport Lead
Affiliation
INL
h-Index
ORCID
0000-0003-2567-205X
Expertise
BWR, Fluid Mechanics, Gas Cooled, Heat Exchangers, Heat Transfer, Hyrdrogen, Molten Salt, PWR, Thermal Hydraulics, Thermodynamics
NSUF Articles:
CINR Awards Announced - Eight projects were selected Projects will take advantage of NSUF capabilities to investigate important nuclear fuel and material applications. Thursday, June 27, 2019 - Calls and Awards
Additional Publications:
"Global sensitivity analysis using Gaussian process surrogate models & impact of thermophysical properties uncertainties on the steady-state operation of molten salt reactors" Mauricio Tano, Piyush Sabharwall, Yousry Azmy, Fadel M. Nasr, [2025] Annals of Nuclear Energy · DOI: 10.1016/j.anucene.2025.111304
"Development and experimental evaluation of an acoustic flow meter prototype for measuring air flow" Nicholas Williams, Jason Palmer, Robin V. Roper, Richard N. Christensen, Piyush Sabharwall, Paul Marotta, Silvino A. Balderrama Prieto, [2025] Measurement · DOI: 10.1016/j.measurement.2024.115623
"Droplet Entrainment in Steam Supply System of Water-Cooled Small Modular Reactors: Experiment and Modeling Approaches" Palash Kumar Bhowmik, Piyush Sabharwall, Kenneth Lee Fossum, [2024] Journal of Nuclear Engineering · DOI: 10.3390/jne5040035

Droplet entrainment in steam-flow is a prominent phenomenon that needs adequate safety and risk analysis of postulated transient and accident scenarios—including experimental investigation and representative modeling and simulation (M&S)—for small modular reactor (SMR) system design and demonstration. This study identifies knowledge gaps by evaluating experimental and computational fluid dynamics modeling approaches to support early-stage reactor system design, testing, and model evaluation. Previous studies reported in the literature for steam-flow entrainment primarily focused on gigawatt capacity pressurized water reactor (PWR) systems. However, entrainment phenomena are even more prominent for PWR-type SMRs due to their more compact integrated designs, which need further research and development. To fill the research gaps, this study provides insight by specifying the phenomena of interest by leveraging the lessons learned from past research, adopting advanced M&S techniques and advanced instrumentation and control. The findings and recommendations are applicable for evaluating steam-flow entrainment models and for designing integral effect test and separate effect test facilities for gaining reactor design approvals.

"Dynamics of Molten Salt Reactor with Operating Heaters" Pavel Tsvetkov, Piyush Sabharwall, Thabit Abuqudaira, [2024] Nuclear Science and Engineering · DOI: 10.1080/00295639.2024.2423132
"Once-Through Steam Generator Model Analysis Using Python and Advanced Optimization Tools (Summer Internship Report)" Palash Bhowmik, Piyush Sabharwall, Nicholas Hernandez, [2024] · DOI: 10.2172/2474849
"Advanced Data Science Model for Detecting Intelligent Malware" Guenevere Chen, Piyush Sabharwall, Palash Bhowmik, Allan Aanonsen, [2024] · DOI: 10.2172/2448410
"Leveraging Optimal Sparse Sensor Placement to Aggregate a Network of Digital Twins for Nuclear Subsystems" Congjian Wang, Palash K. Bhowmik, Joshua J. Cogliati, Silvino A. Balderrama Prieto, Changhu Xing, Andrei A. Klishin, Richard Skifton, Musa Moussaoui, Charles P. Folsom, Joe J. Palmer, Piyush Sabharwall, Krithika Manohar, Mohammad G. Abdo, Niharika Karnik, [2024] Energies · DOI: 10.3390/en17133355

Nuclear power plants (NPPs) require continuous monitoring of various systems, structures, and components to ensure safe and efficient operations. The critical safety testing of new fuel compositions and the analysis of the effects of power transients on core temperatures can be achieved through modeling and simulations. They capture the dynamics of the physical phenomenon associated with failure modes and facilitate the creation of digital twins (DTs). Accurate reconstruction of fields of interest (e.g., temperature, pressure, velocity) from sensor measurements is crucial to establish a two-way communication between physical experiments and models. Sensor placement is highly constrained in most nuclear subsystems due to challenging operating conditions and inherent spatial limitations. This study develops optimized data-driven sensor placements for full-field reconstruction within reactor and steam generator subsystems of NPPs. Optimized constrained sensors reconstruct field of interest within a tri-structural isotropic (TRISO) fuel irradiation experiment, a lumped parameter model of a nuclear fuel test rod and a steam generator. The optimization procedure leverages reduced-order models of flow physics to provide a highly accurate full-field reconstruction of responses of interest, noise-induced uncertainty quantification and physically feasible sensor locations. Accurate sensor-based reconstructions establish a foundation for the digital twinning of subsystems, culminating in a comprehensive DT aggregate of an NPP.

"Evaluating direct vessel injection accident-event progression of AP1000 and key figures of merit to support the design and development of water-cooled small modular reactors" Palash K. Bhowmik, David Arcilesi, Piyush Sabharwall, Hossam H. Abdellatif, [2024] Nuclear Engineering and Technology · DOI: 10.1016/j.net.2024.01.049
"Single Primary Heat Extraction and Removal Emulator (SPHERE) Long Duration Testing" Jeremy Hartvigsen, Travis Neumann, Piyush Sabharwall, Zachary Sellers, [2024] · DOI: 10.2172/2472941
"Single Primary Heat Extraction and Removal Emulator (SPHERE) Power Transient Testing" Jeremy Hartvigsen, Piyush Sabharwall, Zachary Sellers, [2024] · DOI: 10.2172/2371713
"Heat Pipe Cooled Microreactors" Zachary Sellers, Jeremy Hartvigsen, Piyush Sabharwall, Katrina Sweetland, Ilyas Yilgor, [2024] · DOI: 10.2172/2337608
"Linear and Non-linear Optical Characterization of Glass and Sapphire for Optical Instrumentation of Advanced Fission Reactors" Matthew Zile, Christian Petrie, Piyush Sabharwall, Miloš Burger, Igor Jovanovic, Bryan Morgan, [2023] · DOI: 10.2172/2324624
"The Effect of Point Reactor Kinetics Solvers on the Uncertainties of Nuclear Reactor Simulations" Pavel Tsvetkov, Piyush Sabharwall, Thabit Abuqudaira, [2023] · DOI: 10.2172/2324608
"Analyses Supporting Heat Pipe Experiments" Piyush Sabharwall, Jeremy Hartvigsen, Ilyas Yilgor, [2023] · DOI: 10.2172/2326078
"Fuel Flow Modeling under Thermal Fluidics Considerations within Operational Domains of Molten Salt Reactors" Pavel Tsvetkov, Piyush Sabharwall, Thabit Abuqudaira, [2023] · DOI: 10.2172/2324977
"In situ embedment of type K sheathed thermocouples with directed energy deposition" Piyush Sabharwall, Isabella J. van Rooyen, Luis Nuñez, [2023] The International Journal of Advanced Manufacturing Technology · DOI: 10.1007/s00170-023-11624-6
"Assessment of Nuclear Sensors and Instrumentation Maturity in Advanced Nuclear Reactors" Pavel Tsvetkov, Piyush Sabharwall, Thabit Abuqudaira, [2023] · DOI: 10.2172/2324979
"A Critical Review of Heat Pipe Experiments in Nuclear Energy Applications" Joshua Hansel, Piyush Sabharwall, Amir Ali, Scott Wahlquist, [2023] Nuclear Science and Engineering · DOI: 10.1080/00295639.2022.2082230
"Special issue on Advanced Reactor Thermal Hydraulics Experiments and Modeling Supporting Verification and Validation Needs" Xiaodong Sun, Piyush Sabharwall, [2023] Nuclear Science and Engineering · DOI: 10.1080/00295639.2023.2175571
"Foreword: Special issue on the U.S. Department of Energy Microreactor Program" Piyush Sabharwall, John H. Jackson, [2023] Nuclear Technology · DOI: 10.1080/00295450.2022.2134723
"Nonnuclear Experimental Capabilities to Support Design, Development, and Demonstration of Microreactors" J. L. Hartvigsen, T. J. Morton, J. Yoo, S. Qin, M. Song, D. P. Guillen, T. Unruh, J. E. Hansel, J. Jackson, J. Gehin, H. Trellue, D. Mascarenas, R. S. Reid, C. M. Petrie, P. Sabharwall, [2023] Nuclear Technology · DOI: 10.1080/00295450.2022.2043087
"Development and Demonstration of a Prototype Molten Salt Sampling System" Steve Krahn, Paul Marotta, Adam Burak, Xiaodong Sun, Piyush Sabharwall, Megan Harkema, [2023] · DOI: 10.2172/2324780
"Preliminary Design Needs for High-Temperature Heat Pipe Imaging System" Zachary Sellers, Jeremy Hartvigsen, Scott Thompson, Piyush Sabharwall, Victor Petrov, Annalisa Manera, Sunming Qin, [2022] · DOI: 10.2172/1960291
"Preconceptual Design of Multifunctional Gas-Cooled Cartridge Loop for the Versatile Test Reactor: Instrumentation and Measurement—Part II" Kevan Weaver, N. K. Anand, Chris Ellis, Xiaodong Sun, Hangbok Choi, Di Chen, Rich Christensen, Brian M. Fronk, Joshua Gess, Yassin Hassan, Igor Jovanovic, Annalisa Manera, Victor Petrov, Rodolfo Vaghetto, Silvino Balderrama-Prieto, Adam J. Burak, Milos Burger, Alberto Cardenas-Melgar, Daniel Orea, Reynaldo Chavez, Byunghee Choi, Londrea Garrett, Genevieve L. Gaudin, Noah Sutton, Ken William Ssennyimba, Josh Young, Piyush Sabharwall, [2022] Nuclear Science and Engineering · DOI: 10.1080/00295639.2022.2070384
"Preconceptual Design of Multifunctional Gas-Cooled Cartridge Loop for the Versatile Test Reactor—Part I" Kevan Weaver, N. K. Anand, Chris Ellis, Xiaodong Sun, Di Chen, Hangbok Choi, Rich Christensen, Brian M. Fronk, Joshua Gess, Yassin Hassan, Igor Jovanovic, Annalisa Manera, Victor Petrov, Rodolfo Vaghetto, Silvino Balderrama-Prieto, Adam J. Burak, Milos Burger, Alberto Cardenas-Melgar, Londrea Garrett, Genevieve L. Gaudin, Daniel Orea, Reynaldo Chavez, Byunghee Choi, Noah Sutton, Ken William Ssennyimba, Josh Young, Piyush Sabharwall, [2022] Nuclear Science and Engineering · DOI: 10.1080/00295639.2022.2070383
"SPHERE Gap Conductance Test" Jeremy Hartvigsen, Piyush Sabharwall, Minseop Song, Zachary Sellers, [2022] · DOI: 10.2172/2558101
"Preliminary Pilot-scale Study and Techno-economic Analysis of Chemical Heat Pump with Conventional Nuclear Reactors" Piyush Sabharwall, Vivek Utgikar, Aman Gupta, [2022] · DOI: 10.2172/1885160
"Large eddy simulation of flow through an axisymmetric sudden expansion" N. K. Anand, Yassin A. Hassan, Piyush Sabharwall, Byung-Hee Choi, [2022] Physics of Fluids · DOI: 10.1063/5.0095569

This study aims at investigating the inlet flow conditions of flow through an axisymmetric sudden expansion with an expansion ratio of 2.0. A series of large eddy simulations with the WALE model were conducted for different inlet Reynolds numbers (Re) and turbulence intensities (urms/U¯m). The reattachment length, defined as the length measured downstream of the expansion where the flow direction is reversed adjacent to the wall (Lr), was measured for each case. For widely studied inlet turbulence intensity values (TI), the simulation results are in good agreement with the experimental and numerical results reported in the literature. Parametric studies revealed that turbulence intensity affects the critical Reynolds number, marking the transition between the laminar and transition regions and the reattachment length. The critical Reynolds number was found to decrease with increasing turbulence intensity. A correlation expression is proposed. Additional analysis with proper orthogonal decomposition was performed to enhance the understanding of complex flow structures downstream of the expansion. Finally, an overall correlation expression for the reattachment length was obtained for 500 ≤ Re ≤ 15 000 and 0.2 ≤ TI (%) ≤ 20. For a given turbulence intensity, the reattachment length can be expressed for laminar and turbulent regions as a function of the Reynolds number. The reattachment length in the transition region can be expressed as a fractional average of reattachment lengths for laminar and turbulent flows.

"SPHERE Gas Composition Test and SOCKEYE Validation" Piyush Sabharwall, Jeremy Hartvigsen, Minseop Song, Zachary Sellers, [2022] · DOI: 10.2172/2462698
"Digital Engineering Sensor Architectures for Future Microreactor Builds" Christopher Ritter, Piyush Sabharwall, Paul Plachinda, [2021] · DOI: 10.2172/1827623
"Post-irradiation examination of optical components for advanced fission reactor instrumentation" Matthew Van Zile, Piyush Sabharwall, Milos Burger, Igor Jovanovic, Bryan William Morgan, [2021] Review of Scientific Instruments · DOI: 10.1063/5.0066069

The use of optical instrumentation in advanced nuclear fission systems, such as molten salt reactors, liquid metal-cooled reactors, and high-temperature gas-cooled reactors, has the potential to enhance reactor safety and economic performance through in situ and online measurement of reactor conditions. Selection of suitable optical components, such as optical windows and fibers, is essential for operation of optical instrumentation in intense radioactive and thermal environments inherent to nuclear reactor systems. We present the development and performance of a self-contained and mobile post-irradiation examination system for rapid characterization of the optical properties of materials. The instrument combines linear absorption and nanosecond Z-scan modules in a compact, relocatable design. The system mobility allows for the evaluation of optical samples at the site of irradiation, minimizing the delay between extraction from the irradiation site and optical characterization. This provides nearly real-time information on the material performance under simultaneous irradiation and thermal annealing, simulating the relevant conditions for the use of those components in nuclear power systems.

"Structural Health Monitoring of Microreactor Safety Systems Using Convolutional Neural Networks" Harleen Sandhu, Saran Bodda, Abhinav Gupta, Xu Wu, Piyush Sabharwall, Erin Yan, [2021] · DOI: 10.2172/1824205
"Understanding Melting and Freezing/Solidification and the Associated Effects on Heat Transfer" Scott Wahlquist, Piyush Sabharwall, Amir Ali, [2021] · DOI: 10.2172/1823033
"DOE Microreactor Program: Summary of Experimental Capabilities Development and Activities" Holly Trellue, Jeremy Hartvigsen, Terry Morton, Donna Guillen, Yasir Arafat, Theresa Cutler, Keith Jewell, Erik Luther, Robert Reid, Chase Taylor, Troy Unruh, Chris Petrie, David Mascarenas, Peter Meyerhoffer, James Jewell, Jess Gehin, John Jackson, Piyush Sabharwall, [2021] · DOI: 10.2172/1824347
"Experimental Capabilities to Support Design, Development and Demonstration of Microreactors" Jeremy Hartvigsen, Terry Morton, Donna Guillen, Troy Unruh, John Jackson, Jess Gehin, H. Trellue, D. Mascarenas, R. Reid, Piyush Sabharwall, [2021] · DOI: 10.2172/2371663
"Test Article and Test Plan for Heat-Pipe Gap-Conductance Testing" Zachary Sellers, Piyush Sabharwall, Jeremy Hartvigsen, [2021] · DOI: 10.2172/1778233
"SPHERE Assembly and Operation Demonstration" Jeremy Hartvigsen, Terry Morton, Zachary Sellers, Jun Yoo, Piyush Sabharwall, [2020] · DOI: 10.2172/1824206
"Separating Nuclear Reactors from the Power Block with Heat Storage: A New Power Plant Design Paradigm" Piyush Sabharwall, Andrew Sowder, Charles Forsberg, [2020] · DOI: 10.2172/1768046
"Development of Innovative Measurement Techniques for Fission Product Transport Quantification" Byung-Hee Choi, Thien Nguyen, Rodolfo Vaghetto, Yassin Hassan, N. Anand, Piyush Sabharwall, Daniel Orea, [2020] · DOI: 10.2172/1631739
"Investigations on the Thermal-hydraulic Behavior of Accident Tolerant Fuel Cladding Materials" M. Bucci, Piyush Sabharwall, G. Su, [2020] · DOI: 10.2172/1594995
"Heat Storage Coupled to Generation IV Reactors for Variable Electricity from Base-load Reactors: Workshop Proceedings. Changing markets, technology, nuclear-renewables integration and synergisms with solar thermal power systems" Piyush Sabharwall, Hans Gougar, Charles Forsberg, [2019] · DOI: 10.2172/1575201
"Integrated Modeling and Simulation Capability For Full Scale Multi-Physics Simulation and Visualization of Microreactor Concept" Ching-Sheng Lin, Joshua Hansel, Vincent Laboure, David Andrs, William Hoffman, Stephen Novascone, Andrew Slaughter, Richard Martineau, Piyush Sabharwall, [2019] · DOI: 10.2172/1643493
"Special Purpose Application Reactors: Systems Integration Decision Support" Piyush Sabharwall, Shannon Bragg-Sitton, Konor Frick, Patrick McClure, D. Rao, John Kennedy, [2018] · DOI: 10.2172/1475413
"Database of Previous Research Supporting Microreactor Designs" Patrick McClure, D. Rao, Rory Kennedy, Piyush Sabharwall, [2018] · DOI: 10.2172/1824207
"Heat Storage Options for Sodium, Salt and Helium Cooled Reactors to Enable Variable Electricity to the Grid and Heat to Industry with Base-Load Reactor Operations" Piyush Sabharwall, Charles Forsberg, [2018] · DOI: 10.2172/1544759
"Thermal Energy Delivery System Design Basis Report" Alexander Duenas, Piyush Sabharwall, James O'Brien, Jun Yoo, Shannon Bragg-Sitton, Carl Stoots, [2018] · DOI: 10.2172/1756571
"Regulatory and Licensing Strategy for Microreactor Technology" Mark Holbrook, Piyush Sabharwall, Denise Owusu, [2018] · DOI: 10.2172/1565916
"A Review of Light Water Reactor Costs and Cost Drivers" Piyush Sabharwall, Karen Dawson, [2017] · DOI: 10.2172/1466793
"High-Pressure, High-Temperature Thermal Hydraulic Test Facility for Nuclear-Renewable Hybrid Energy System Studies; Facility Design Description and Status Report" Su -Jong Yoon, Piyush Sabharwall, Shannon M. Bragg-Sitton, James E. O'Brien, [2017] · DOI: 10.2172/1468574
"Adsorption of radioactive iodine and krypton from off-gas stream using continuous flow adsorption column" Kai Coldsnow, Austin Porter, Piyush Sabharwall, D. Eric Aston, David N. McIlroy, Vivek Utgikar, Sachin U. Nandanwar, [2017] Chemical Engineering Journal · DOI: 10.1016/j.cej.2017.03.020
"Development and validation of Nusselt number and friction factor correlations for laminar flow in semi-circular zigzag channel of printed circuit heat exchanger" James O'Brien, Minghui Chen, Piyush Sabharwall, Xiaodong Sun, Su-Jong Yoon, [2017] Applied Thermal Engineering · DOI: 10.1016/j.applthermaleng.2017.05.135
"A phase-field approach to model multi-axial and microstructure dependent fracture in nuclear grade graphite" Piyush Sabharwall, Mark C. Carroll, Pritam Chakraborty, [2016] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2016.04.006
"Activity of nanostructured C@ETS-10 sorbent for capture of volatile radioactive iodine from gas stream" Kai Coldsnow, Michael Green, Vivek Utgikar, Piyush Sabharwall, D. Eric Aston, Sachin U. Nandanwar, [2016] Chemical Engineering Journal · DOI: 10.1016/j.cej.2015.11.091
"Capture of harmful radioactive contaminants from off-gas stream using porous solid sorbents for clean environment - A review" Kai Coldsnow, Vivek Utgikar, Piyush Sabharwall, D. Eric Aston, Sachin U. Nandanwar, [2016] Chemical Engineering Journal · DOI: 10.1016/j.cej.2016.07.073
"Control of Advanced Reactor-Coupled Heat Exchanger System: Incorporation of Reactor Dynamics in System Response to Load Disturbances" Vivek Utgikar, Richard Christensen, Minghui Chen, Xiaodong Sun, Piyush Sabharwall, Isaac Skavdahl, [2016] Nuclear Engineering and Technology · DOI: 10.1016/j.net.2016.05.001
"EXERGY ANALYSIS FOR SMALL MODULAR REACTOR HYBRID ENERGY SYSTEM" [2016] Proceedings of the Asme Nuclear Forum - 2015
"Exergy analysis of thermal energy storage options with nuclear power plants" Hitesh Bindra, Piyush Sabharwall, Jacob Edwards, [2016] Annals of Nuclear Energy · DOI: 10.1016/j.anucene.2016.06.005
"Experimental Study of DRACS Thermal Performance in a Low-Temperature Test Facility" H. C. Lin, S. Shi, X. Sun, R. N. Christensen, T. E. Blue, G. Yoder, D. Wilson, P. Sabharwall, Q. Lv, [2016] Nuclear Technology · DOI: 10.13182/nt16-41
"Experimental and numerical study of a printed circuit heat exchanger" Xiaodong Sun, Richard N. Christensen, Shanbin Shi, Isaac Skavdahl, Vivek Utgikar, Piyush Sabharwall, Minghui Chen, [2016] Annals of Nuclear Energy · DOI: 10.1016/j.anucene.2016.07.010
"Fales Hot Springs: a case study in renewable augmented net zero energy" Piyush Sabharwall, Meghan Kerrigan, Stephen Brown, Andy Cloud, [2016] Electricity Journal · DOI: 10.1016/j.tej.2016.06.012
"Modeling and simulation of control system response to temperature disturbances in a coupled heat exchangers-AHTR system" V.P. Utgikar, R. Christensen, P. Sabharwall, M. Chen, X. Sun, I. Skavdahl, [2016] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2016.01.010
"Porous microsphere of magnesium oxide as an effective sorbent for removal of volatile iodine from off-gas stream" Julia Dantas, Kai Coldsnow, Michael Green, Vivek Utgikar, Piyush Sabharwall, D. Eric Aston, Sachin U. Nandanwar, [2016] Adsorption-Journal of the International Adsorption Society · DOI: 10.1007/s10450-016-9781-1
"Pressure drop and heat transfer characteristics of a high-temperature printed circuit heat exchanger" Xiaodong Sun, Richard N. Christensen, Isaac Skavdahl, Vivek Utgikar, Piyush Sabharwall, Minghui Chen, [2016] Applied Thermal Engineering · DOI: 10.1016/j.applthermaleng.2016.07.149
"Radiation Heat Transfer in the Molten Salt FLiNaK" Thomas Blue, Piyush Sabharwall, Ethan S. Chaleff, [2016] Nuclear Technology · DOI: 10.13182/nt16-52
"Synthesis and characterization of ETS-10: supported hollow carbon nano-polyhedrons nanosorbent for adsorption of krypton at near ambient temperatures" Kai Coldsnow, Vivek Utgikar, Piyush Sabharwall, D. Eric Aston, Yanning Zhang, Sachin U. Nandanwar, [2016] Adsorption-Journal of the International Adsorption Society · DOI: 10.1007/s10450-015-9702-8
"Thermodynamic exergy analysis for small modular reactor in nuclear hybrid energy system" Piyush Sabharwall, Cristian Rabiti, Shannon M. Bragg-Sitton, Li Liu, Lauren Boldon, [2016] Epj Nuclear Sciences & Technologies · DOI: 10.1051/epjn/2016011
"Comparative analysis of compact heat exchangers for application as the intermediate heat exchanger for advanced nuclear reactors" M. Chen, V.P. Utgikar, X. Sun, I.-H. Kim, R. Christensen, P. Sabharwall, N. Bartel, [2015] Annals of Nuclear Energy · DOI: 10.1016/j.anucene.2015.03.029
"Control strategy development of advanced high temperature reactor system" [2015] Transactions of the American Nuclear Society
"DEVELOPMENT OF A MULTI-LOOP FLOW AND HEAT TRANSFER FACILITY FOR ADVANCED NUCLEAR REACTOR THERMAL HYDRAULIC AND HYBRID ENERGY SYSTEM STUDIES" [2015] Proceedings of the Asme International Mechanical Engineering Congress and Exposition, 2014, Vol 8a
"DRACS thermal performance evaluation for FHR" H.C. Lin, I.H. Kim, X. Sun, R.N. Christensen, T.E. Blue, G.L. Yoder, D.F. Wilson, P. Sabharwall, Q. Lv, [2015] Annals of Nuclear Energy · DOI: 10.1016/j.anucene.2014.10.032
"Experimental facility for development of high-temperature reactor technology: instrumentation needs and challenges" James E. O’Brien, SuJong Yoon, Xiaodong Sun, Piyush Sabharwall, [2015] Epj Nuclear Sciences & Technologies · DOI: 10.1051/epjn/e2015-50011-8
"Krypton removal from the off-gas stream using the hollow carbon based nanosorbent" [2015] Transactions of the American Nuclear Society
"Nuclear Renewable Energy Integration: An Economic Case Study" Shannon Bragg-Sitton, Lauren Boldon, Seth Blumsack, Piyush Sabharwall, [2015] Electricity Journal · DOI: 10.1016/j.tej.2015.09.003
"SCALE ANALYSIS AND EXPERIMENTAL RESULTS OF A SOLID/LIQUID PHASE-CHANGE THERMAL ENERGY STORAGE SYSTEM" [2015] Proceedings of the Asme International Mechanical Engineering Congress and Exposition, 2014, Vol 8b
"Scaling analysis for the direct reactor auxiliary cooling system for FHRs" X. Wang, I.H. Kim, X. Sun, R.N. Christensen, T.E. Blue, G. Yoder, D. Wilson, P. Sabharwall, Q. Lv, [2015] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2014.12.035
"Study of the parameters that influence small modular reactor investment costs" [2015] Transactions of the American Nuclear Society
"Thermoeconomic analysis for nuclear-renewable hybrid energy system with hydrogen production" [2015] Transactions of the American Nuclear Society
"Transient analysis of an FHR coupled to a helium Brayton power cycle" In Hun Kim, Xiaodong Sun, Richard Christensen, Vivek Utgikar, Piyush Sabharwall, Minghui Chen, [2015] Progress in Nuclear Energy · DOI: 10.1016/j.pnucene.2015.02.015
"ASME MATERIAL CHALLENGES FOR ADVANCE REACTOR CONCEPTS" [2014] Proceedings of the Asme Summer Heat Transfer Conference - 2013, Vol 4
"Advanced heat exchanger development for molten salts" Denis Clark, Michael Glazoff, Guiqiu Zheng, Kumar Sridharan, Mark Anderson, Piyush Sabharwall, [2014] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2014.09.026
"DESIGN OF FLUIDIC DIODE FOR A HIGH-TEMPERATURE DRACS TEST FACILITY" [2014] Proceedings of the 21st International Conference on Nuclear Engineering - 2013, Vol 4
"Numerical study on crossflow printed circuit heat exchanger for advanced small modular reactors" Piyush Sabharwall, Eung-Soo Kim, Su-Jong Yoon, [2014] International Journal of Heat and Mass Transfer · DOI: 10.1016/j.ijheatmasstransfer.2013.10.079
"Oxidation and hydrogen uptake in zirconium, Zircaloy-2 and Zircaloy-4: Computational thermodynamics and ab initio calculations" Akira Tokuhiro, Sergey N. Rashkeev, Piyush Sabharwall, Michael V. Glazoff, [2014] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2013.09.038
"Parametric study on maximum transportable distance and cost for thermal energy transportation using various coolants" Piyush Sabharwall, Su-Jong Yoon, [2014] Progress in Nuclear Energy · DOI: 10.1016/j.pnucene.2014.02.016
"RELAP5-3D modelling of heat transfer components (intermediate heat exchanger and helical-coil steam generator) for NGNP application" Piyush Sabharwall, Nolan A. Anderson, [2014] International Journal of Nuclear Energy Science and Technology · DOI: 10.1504/ijnest.2014.057906
"RELAP5-3D transient modelling for NGNP integrated plant" Piyush Sabharwall, Nolan A. Anderson, [2014] International Journal of Nuclear Energy Science and Technology · DOI: 10.1504/ijnest.2014.063015
"SCALE/ANALYTICAL ANALYSES OF FREEZING AND CONVECTIVE MELTING WITH INTERNAL HEAT GENERATION" [2014] Proceedings of the Asme Summer Heat Transfer Conference - 2013, Vol 2
"TECHNOLOGIES FOR UPGRADING LIGHT WATER REACTOR OUTLET TEMPERATURE" [2014] Proceedings of the Asme Summer Heat Transfer Conference - 2013, Vol 1
"TRITIUM PRODUCTION AND PERMEATION IN HIGH-TEMPERATURE REACTOR SYSTEMS" [2014] Proceedings of the Asme Summer Heat Transfer Conference - 2013, Vol 4
"Challenges in the development of high temperature reactors" Shannon M. Bragg-Sitton, Carl Stoots, Piyush Sabharwall, [2013] Energy Conversion and Management · DOI: 10.1016/j.enconman.2013.02.021
"Design of Printed Circuit Heat Exchangers for Very High Temperature Reactors" [2013] Transactions of the American Nuclear Society
"Diffusion-Welded Microchannel Heat Exchanger for Industrial Processes" Denis E. Clark, Ronald E. Mizia, Michael V. Glazoff, Michael G. McKellar, Piyush Sabharwall, [2013] Journal of Thermal Science and Engineering Applications · DOI: 10.1115/1.4007578

The goal of next generation reactors is to increase energy efficiency in the production of electricity and provide high-temperature heat for industrial processes. The efficient transfer of energy for industrial applications depends on the ability to incorporate effective heat exchangers between the nuclear heat transport system and the industrial process. The need for efficiency, compactness, and safety challenge the boundaries of existing heat exchanger technology. Various studies have been performed in attempts to update the secondary heat exchanger that is downstream of the primary heat exchanger, mostly because its performance is strongly tied to the ability to employ more efficient industrial processes. Modern compact heat exchangers can provide high compactness, a measure of the ratio of surface area-to-volume of a heat exchange. The microchannel heat exchanger studied here is a plate-type, robust heat exchanger that combines compactness, low pressure drop, high effectiveness, and the ability to operate with a very large pressure differential between hot and cold sides. The plates are etched and thereafter joined by diffusion welding, resulting in extremely strong all-metal heat exchanger cores. After bonding, any number of core blocks can be welded together to provide the required flow capacity. This study explores the microchannel heat exchanger and draws conclusions about diffusion welding/bonding for joining heat exchanger plates, with both experimental and computational modeling, along with existing challenges and gaps. Also, presented is a thermal design method for determining overall design specifications for a microchannel printed circuit heat exchanger for both supercritical (24 MPa) and subcritical (17 MPa) Rankine power cycles.

"Dynamic Response Analysis of a Scaled-Down Offset Strip-Fin Intermediate Heat Exchanger" [2013] Transactions of the American Nuclear Society
"Energy Storage Systems for Nuclear Facilities" [2013] Transactions of the American Nuclear Society
"Numerical Study on the Crossflow Printed Circuit Heat Exchanger for Advanced Small Modular Reactors" [2013] Transactions of the American Nuclear Society
"Thermal-Hydraulic Design of Wavy Channel Printed Circuit Heat Exchangers for Advanced Reactors" [2013] Transactions of the American Nuclear Society
"Transient Model of Wavy-Channel Printed Circuit Heat Exchangers" [2013] Transactions of the American Nuclear Society
"Validation of A MATLAB Code Developed for DRACS Thermal Performance Evaluation" [2013] Transactions of the American Nuclear Society
"A MATLAB Code for Thermal Performance Evaluation of a Low-Temperature DRACS Test Facility" [2012] Transactions of the American Nuclear Society
"COMPUTATIONAL INTELLIGENCE AS A TOOL FOR SMALL MODULAR REACTORS" [2012] Proceedings of the Asme Small Modular Reactors Symposium (Smr 2011)
"Design of a Scaled-down Low-temperature DRACS Test Facility for an AHTR" [2012] Transactions of the American Nuclear Society
"Evaluation methodology for advance heat exchanger concepts using analytical hierarchy process" Eung Soo Kim, Mike Patterson, Piyush Sabharwall, [2012] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2012.03.030
"MOLTEN SALT MIXTURE PROPERTIES (KF-ZrF4 AND KCl-MgCl2) FOR USE IN RELAP5-3D FOR HIGH-TEMPERATURE REACTOR APPLICATION" P. Sabharwall, N. A. Anderson, [2012] Nuclear Technology · DOI: 10.13182/nt12-a13598
"NATURAL CIRCULATION AND LINEAR STABILITY ANALYSIS FOR LIQUID-METAL REACTORS WITH THE EFFECT OF FLUID AXIAL CONDUCTION" Yeon Jong Yoo, Qiao Wu, James J. Sienicki, Piyush Sabharwall, [2012] Nuclear Technology · DOI: 10.13182/nt12-a13595
"PRELIMINARY DESIGN FOR CONVENTIONAL AND COMPACT SECONDARY HEAT EXCHANGER IN A MOLTEN SALT REACTOR" [2012] Proceedings of the Asme Summer Heat Transfer Conference, 2012, Vol 1
"SMALL MODULAR MOLTEN SALT REACTOR (SM-MSR)" [2012] Proceedings of the Asme Small Modular Reactors Symposium (Smr 2011)
"Simulations of Dynamics and Control of Advanced Reactor Systems using Artificial Neural Networks" [2012] Transactions of the American Nuclear Society
"A Modular Design of a Direct Reactor Auxiliary Cooling System for AHTRs" [2011] Transactions of the American Nuclear Society
"CFD Applications for Predicting Flow Behavior in Advanced Gas Cooled Reactors" [2011] Computational Fluid Dynamics Technologies and Applications
"Design of a Scaled-down DRACS Test Facility for an AHTR" [2011] Transactions of the American Nuclear Society
"Development of Figure of Merits (FOMs) for Intermediate Coolant Characterization and Selection" [2011] Transactions of the American Nuclear Society
"Evaluation Metrics for Intermediate Heat Exchangers for Next Generation Nuclear Reactors" [2011] Transactions of the American Nuclear Society
"Optimal artificial neural network architecture selection for performance prediction of compact heat exchanger with the EBaLM-OTR technique" Milos Manic, Piyush Sabharwall, Vivek Utgikar, Dumidu Wijayasekara, [2011] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2011.04.045
"Scaling Analysis for the Direct Reactor Auxiliary Cooling System for AHTRs" [2011] Transactions of the American Nuclear Society
"Phase change heat transfer device for process heat applications" Mike Patterson, Vivek Utgikar, Fred Gunnerson, Piyush Sabharwall, [2010] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2010.05.054
"DIMENSIONLESS NUMBERS IN PHASE-CHANGE THERMOSYPHON AND HEAT-PIPE HEAT EXCHANGERS" Vivek Utgikar, Fred Gunnerson, Piyush Sabharwall, [2009] Nuclear Technology · DOI: 10.13182/nt09-a8967
"Design of Liquid Metal Phase Change Heat Exchanger for Next-Generation Nuclear Plant Process Heat Application" Vivek UTGIKAR, Akira TOKUHIRO, Fred GUNNERSON, Piyush SABHARWALL, [2009] Journal of Nuclear Science and Technology · DOI: 10.1080/18811248.2007.9711559
"EFFECT OF MASS FLOW RATE ON THE CONVECTIVE HEAT TRANSFER COEFFICIENT: ANALYSIS FOR CONSTANT VELOCITY AND CONSTANT AREA CASE" Vivek Utgikar, Fred Gunnerson, Piyush Sabharwall, [2009] Nuclear Technology · DOI: 10.13182/nt09-a7406
"Engineering design elements of a two-phase thermosyphon for the purpose of transferring NGNP thermal energy to a hydrogen plant" Fred Gunnerson, Piyush Sabharwall, [2009] Nuclear Engineering and Design · DOI: 10.1016/j.nucengdes.2009.06.022
"NGNP PROCESS HEAT UTILIZATION: LIQUID METAL PHASE CHANGE HEAT EXCHANGER" [2009] Proceedings of the 4th International Topical Meeting on High Temperature Reactor Technology, Vol 1
"THEORETICAL DESIGN OF THERMOSYPHON FOR PROCESS HEAT TRANSFER FROM NGNP TO HYDROGEN PLANT" [2009] Proceedings of the 4th International Topical Meeting on High Temperature Reactor Technology, Vol 1
"Alternate intermediate heat exchanger design for nuclear hydrogen production" [2007] Transactions of the American Nuclear Society
"Temperature effect on heated region flow starvation for gas-cooled reactors" [2005] Transactions of the American Nuclear Society
Source: ORCID/CrossRef using DOI