Numerical Investigation of Coolant Inlet Configurations for Thermal Homogeneity in 20Ah Prismatic Li-ion Batteries at High Discharge Rates Ajay Vishwakarma, Uttam Rana 5th IEEE International Conference on Sustainable Energy and Future Electric Transportation Sefet 2025, 2025 Temperature non-uniformity within Li-ion battery cells is a key factor behind unexpected performance degradation and thermal runaway. This study uses a coupled NTGK and cold-plate model to numerically investigate thermal behavior in a 20 Ah prismatic cell. Temperature distribution is evaluated using the homogeneity index, both without a cold plate (at 1–4C discharge rates) and with a cold plate (at 4C) under various coolant inlet configurations. Results show that higher C-rates increase thermal imbalance. While all cold-plate configurations help reduce temperature rise, only the bottom-inlet and cross-inlet modes significantly improve temperature uniformity, bringing the homogeneity index below 0.06. However, the cross-inlet shifts the hotspot to the cell’s center, potentially impacting long-term performance.
Optimizing Cell Insert Structure for Enhanced Thermal Management in Air-Cooled Battery Packs Ajay Vishwakarma, Uttam Rana 5th IEEE International Conference on Sustainable Energy and Future Electric Transportation Sefet 2025, 2025 This study employs Taguchi-Grey Relational Analysis to optimize the structural design of cell inserts in air-cooled cylindrical battery systems, aiming to enhance thermal management by minimizing maximum temperature (T<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</inf>) and temperature gradient (ΔT). Through Design of Experiment (DOE)-driven ANSYS Fluent simulations, multi-objective optimization identified an optimal configuration with a 30° angle of shift, 28 mm row spacing, and asymmetric column spacing (C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-2</inf> = 26 mm, C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-3</inf> = 24 mm), achieving T<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</inf> = 37.87 °C and ΔT = 3.35°C. ANOVA revealed the angle of shift as the dominant parameter, contributing 71.92% to T<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</inf> and 76.34% to ΔT variance. While C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2-3</inf> spacing exhibited a secondary influence (8.99% on ΔT), the synergy between angular adjustments and asymmetric spacing improved coolant distribution, mitigating thermal hotspots. These findings underscore the critical role of geometric parameter synergy in advancing thermal homogeneity, offering actionable insights for efficient battery thermal management system design.
Dynamics and thermodynamics of co-flow non-premixed methane–air flame in a cylindrical micro combustor with heat recirculating wall Uttam Rana, Suman Chakraborty, Sankar Kumar Som Combustion Theory and Modelling, 2017 Numerical studies have been made on co-flow non premixed methane air flame in a cylindrical micro combustor with heat recirculating wall. An optimum Peclet number Peopt based on air flow velocity has been observed at which the flame location from the combustor inlet is minimum and the rate of heat recirculation to fresh charge is maximum. The optimum Peclet number is almost independent of the outer wall Nusselt number NuE and the thermal conductivity ratio ks/kg. The rate of heat recirculation shows contrasting increasing and decreasing trends with NuE, depending upon whether Pe < Peopt or Pe >Peopt respectively. A higher limit of Peclet number for flame blow-off and a lower limit of Peclet number for flame extinction have been identified for a given global equivalence ratio and given values of NuE, ks/kg and t/D (the ratio of wall thickness to tube diameter). The upper Pe limit decreases sharply with NuE, while the lower Pe limit is almost uninfluenced by both NuE and ks/kg. Heat diffusion and chemical reaction in the gas phase are found to be the dominant processes of exergy destruction. The second law efficiency shows a minimum value around 30% at an optimum value of Peclet number where flame stand-off becomes minimum.
Numerical investigation of parameter interactions in thermal behavior of prismatic LiFePO₄ cells at high C-rates A Vishwakarma, U Rana International Communications in Heat and Mass Transfer 172, 110502 , 2026 2026.0
Analysis of the influencing parameter on the thermal runaway propagation in prismatic battery: A numerical and statistical approach A Vishwakarma, U Rana Journal of Thermal Analysis and Calorimetry, 1-23 , 2025 2025.0 Citations: 1
Numerical Investigation of Coolant Inlet Configurations for Thermal Homogeneity in 20Ah Prismatic Li-ion Batteries at High Discharge Rates A Vishwakarma, U Rana 2025 IEEE 5th International Conference on Sustainable Energy and Future … , 2025 2025.0 Citations: 1
Optimizing Cell Insert Structure for Enhanced Thermal Management in Air-Cooled Battery Packs A Vishwakarma, U Rana 2025 IEEE 5th International Conference on Sustainable Energy and Future … , 2025 2025.0 Citations: 1
Exploring serpentine cold-plate designs for efficient cooling of Li-ion pouch cells: A computational analysis A Vishwakarma, U Rana International Journal of Heat and Mass Transfer 244, 126896 , 2025 2025.0 Citations: 9
Influence of Central Restriction Height on Average Static Pressure in Dump VP Prajina, NKMU Rana, A Guha Advances in Thermo-Fluid Engineering: Select Proceedings of INCOM 2024, 347 , 2025 2025.0
Influence of Central Restriction Height on Average Static Pressure in Dump Diffusers VP Prajina, NK Manna, U Rana, A Guha International Conference on Mechanical Engineering, 347-360 , 2024 2024.0
Performance Analysis of Sudden Expansion and Dump Diffuser Geometries Across Three Reynolds Number Regime VP Prajina, NK Manna, U Rana, A Guha International Conference on Mechanical Engineering, 389-401 , 2024 2024.0
Enhancement of thermal performance of parabolic trough collector using cavity receiver BJ Hemrom, U Rana, A Ganguly Proceedings of International Conference on Thermofluids: KIIT Thermo 2020 … , 2020 2020.0 Citations: 4
Dynamics and thermodynamics of co-flow non-premixed methane–air flame in a cylindrical micro combustor with heat recirculating wall U Rana, S Chakraborty, SK Som Combustion Theory and Modelling 21 (4), 677-699 , 2017 2017.0 Citations: 2
Prediction of flame speed and exergy analysis of premixed flame in a heat recirculating cylindrical micro combustor U Rana, S Chakraborty, SK Som Energy 126, 658-670 , 2017 2017.0 Citations: 21
Wall heat recirculation and exergy preservation in flow through a small tube with thin heat source SK Som, U Rana International Communications in Heat and Mass Transfer 64, 1-6 , 2015 2015.0 Citations: 10
Thermodynamics of premixed combustion in a heat recirculating micro combustor U Rana, S Chakraborty, SK Som Energy 68, 510-518 , 2014 2014.0 Citations: 75
Comparative Analysis of Air Cooled, Cold-Plate Cooled, and Pcm Cooled Battery Thermal Management Systems with Application in Li-Ion Batteries U Rana
MOST CITED SCHOLAR PUBLICATIONS
Thermodynamics of premixed combustion in a heat recirculating micro combustor U Rana, S Chakraborty, SK Som Energy 68, 510-518 , 2014 2014.0 Citations: 75
Prediction of flame speed and exergy analysis of premixed flame in a heat recirculating cylindrical micro combustor U Rana, S Chakraborty, SK Som Energy 126, 658-670 , 2017 2017.0 Citations: 21
Wall heat recirculation and exergy preservation in flow through a small tube with thin heat source SK Som, U Rana International Communications in Heat and Mass Transfer 64, 1-6 , 2015 2015.0 Citations: 10
Exploring serpentine cold-plate designs for efficient cooling of Li-ion pouch cells: A computational analysis A Vishwakarma, U Rana International Journal of Heat and Mass Transfer 244, 126896 , 2025 2025.0 Citations: 9
Enhancement of thermal performance of parabolic trough collector using cavity receiver BJ Hemrom, U Rana, A Ganguly Proceedings of International Conference on Thermofluids: KIIT Thermo 2020 … , 2020 2020.0 Citations: 4
Dynamics and thermodynamics of co-flow non-premixed methane–air flame in a cylindrical micro combustor with heat recirculating wall U Rana, S Chakraborty, SK Som Combustion Theory and Modelling 21 (4), 677-699 , 2017 2017.0 Citations: 2
Analysis of the influencing parameter on the thermal runaway propagation in prismatic battery: A numerical and statistical approach A Vishwakarma, U Rana Journal of Thermal Analysis and Calorimetry, 1-23 , 2025 2025.0 Citations: 1
Numerical Investigation of Coolant Inlet Configurations for Thermal Homogeneity in 20Ah Prismatic Li-ion Batteries at High Discharge Rates A Vishwakarma, U Rana 2025 IEEE 5th International Conference on Sustainable Energy and Future … , 2025 2025.0 Citations: 1
Optimizing Cell Insert Structure for Enhanced Thermal Management in Air-Cooled Battery Packs A Vishwakarma, U Rana 2025 IEEE 5th International Conference on Sustainable Energy and Future … , 2025 2025.0 Citations: 1
Numerical investigation of parameter interactions in thermal behavior of prismatic LiFePO₄ cells at high C-rates A Vishwakarma, U Rana International Communications in Heat and Mass Transfer 172, 110502 , 2026 2026.0
Influence of Central Restriction Height on Average Static Pressure in Dump VP Prajina, NKMU Rana, A Guha Advances in Thermo-Fluid Engineering: Select Proceedings of INCOM 2024, 347 , 2025 2025.0
Influence of Central Restriction Height on Average Static Pressure in Dump Diffusers VP Prajina, NK Manna, U Rana, A Guha International Conference on Mechanical Engineering, 347-360 , 2024 2024.0
Performance Analysis of Sudden Expansion and Dump Diffuser Geometries Across Three Reynolds Number Regime VP Prajina, NK Manna, U Rana, A Guha International Conference on Mechanical Engineering, 389-401 , 2024 2024.0
Comparative Analysis of Air Cooled, Cold-Plate Cooled, and Pcm Cooled Battery Thermal Management Systems with Application in Li-Ion Batteries U Rana