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Saptarshi Joshi

Curriculum vitae

Saptarshi Joshi

Ph.D. candidate, Mechanical Science and Engineering, University of Illinois Urbana-Champaign. syjoshi2@illinois.edu

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Education

  1. Ph.D., Mechanical Science and Engineering

    University of Illinois Urbana-Champaign · 2023 – 2028 (exp.)

    Advisor: Prof. Nenad Miljkovic

  2. M.S., Mechanical Engineering

    University of Illinois Urbana-Champaign · 2023 – 2025

    GPA 4.0/4.0

  3. B.Tech. (Honors), Mechanical Engineering; Minor, AI and Data Science

    Indian Institute of Technology Bombay · 2019 – 2023

    GPA 9.53/10

Experience

  1. Graduate Research Assistant

    Energy Transport Research Laboratory, UIUC · 2023 –

    • Manifold cold plate design methodology for 10 kW-class GPU packages: automated CFD pipeline, physics reduced-order model, ML-assisted active learning, additive manufacturing.
    • Co-first author, IJHMT 2026: optimized manifold microchannel cooler for GaN electronics, 208 W/cm², COP 1.6 × 10⁶, CFD within 3 % of experiment.
    • First chip-to-ambient transient model of a direct-to-chip liquid-cooled AI rack (Simscape, 37 000 blocks); 215-case campaign under real workloads and weather; first-author manuscript in preparation.
    • First-author chapter with 3D Systems on a monolithic printed copper cold plate (Advances in Heat Transfer, in revision).
    • Designed and commissioned a two-phase immersion cooling rig for Li-ion cells; electro-thermal modeling of internally cooled prismatic cells.
    • Designed a calorimeter-bar apparatus for cryogenic multi-layer insulation (Cryogenics 2025; M.S. thesis).

  2. Thermal R&D Intern

    Lennox International, Advanced Technology, Dallas TX · 2022 – 2023

    • Developed a "green hybrid" dual-fuel control logic in a Python-EnergyPlus co-simulation; 25 % emissions reduction across six locations.
    • Compressor testing; indoor and outdoor heat exchanger design and simulation for new heat pump products.

  3. Research Intern

    Laboratory of Complex Fluids Research, Université Laval · 2022

    • 250+ high-speed imaging and PIV experiments on buoyant jets in viscoplastic fluids; six new flow regimes; ML prediction of jet characteristics (R² 0.98).

  4. Research Intern

    UCLA, Structures-Computer Interaction Lab · 2021

    • Data-driven modeling for the discrete elastic rods algorithm; hydrodynamic models of bacterial flagella (APS 2022).

Publications

  1. 2026 ·Bazmi, B., Joshi, S., Park, W. Y., Aflatounian, S., Lad, A. A., Liu, J., Shatskiy, E., Garimella, V. S., Tang, C., Lin, Y., Asheghi, M., Mantooth, H. A., Goodson, K. E., Miljkovic, N..High-heat-flux liquid cooling of electronics with manifold microchannels: Thermal-hydraulic optimization and experimental validation. International Journal of Heat and Mass Transfer 268, 128924.doi
  2. 2026 ·Joshi, S., Bazmi, B., Park, W. Y., Farhat, D., Shatskiy, E., Zaki, O. M., Green, S., Black, D., King, W. P., Miljkovic, N..Metal additive manufacturing enables monolithic copper cold plate development with sinusoidal microchannels for direct-to-chip cooling. Advances in Heat Transfer, special issue on Data Center and Electronics Cooling (submitted).
  3. 2026 ·Qiu, H., Garimella, V. S., Li, C., Joshi, S., Roy, R., Bongarala, M., Apigo, D. J., Parbat, S. N., Faisal, S., Salamon, T., Miljkovic, N..Immersion-cooled 1U power supply unit for fanless, warm-liquid-cooled data centers. Applied Thermal Engineering 303, 132309.doi
  4. 2025 ·Aflatounian, S., Luo, K., Sirimanna, S., Gurumukhi, Y., Joshi, S., Parker, D. H., et al..Design and development of an apparatus for evaluating multi-layer insulation effectiveness. Cryogenics.doi
  5. 2025 ·Dipto, M. J., Rabbi, K. F., Liu, Z., Gurumukhi, Y., Sederholm, J. G., Joshi, S., Braun, P. V., Wang, P., Miljkovic, N..Internal flow cooling of cylindrical lithium-ion batteries. Applied Thermal Engineering 281, 128458.doi
  6. 2025 ·Joshi, S. Y..Measurement limits and performance analysis of multilayer insulation under vacuum and cryogenic temperatures using a modified calorimeter-bar setup. M.S. thesis, University of Illinois Urbana-Champaign.
  7. 2024 ·Hassanzadeh, H., Joshi, S., Taghavi, S. M..Predicting buoyant jet characteristics: a machine learning approach. Chemical Product and Process Modeling.doi
  8. 2024 ·Sachin, S. B., Joshi, S., Murallidharan, J. S., Singh, A., Kumaraswamy, G., Sinha, K..Enhancing ventilation of enclosed spaces using CFD, Part 3: Ventilation of high-occupancy rooms of IIT Bombay. Resonance.doi
  9. 2023 ·Hassanzadeh, H., Joshi, S., Akbari, S., Taghavi, S. M..Buoyant miscible jets in a viscoplastic medium with applications in plug and abandonment of oil and gas wells. ASME OMAE 2023.doi
  10. 2022 ·Jawed, M. K., Lim, S., Joshi, S., Habchi, C..Resistive force theory vs. slender body theory as hydrodynamic models in simulation of bacterial flagella. APS March Meeting 2022.

Talks and posters

  1. 2026-09 · Dynamic system modeling of direct-to-chip liquid-cooled data centers. Gamma Technologies industry visit
  2. 2026 · Data center cooling: dynamic system modeling. ACRC Spring Meeting 2026
  3. 2026 · High-heat-flux single-phase liquid cooling of gallium nitride power electronics with manifold microchannels: thermal-hydraulic optimization and experimental validation. ASME InterPACK 2026, Session 04-01 Advanced Liquid Cooling for High-Power Electronics, paper 188693
  4. 2026 · Thermal management for high-power electronics. PECI 2026 (Power and Energy Conference at Illinois)
  5. 2025 · Data center cooling. ACRC Fall Meeting 2025
  6. 2025 · Data center thermal management. ACRC Spring Meeting 2025
  7. 2025 · Thrust 3, thermal management: two-phase immersion and internal cooling of Li-ion cells. FMRG program reviews (April, July, November 2025)
  8. 2025 · Manifold microchannel cooling for GaN power electronics. POETS Annual Conference 2025
  9. 2024 · Two-phase immersion cooling of Li-ion batteries. POETS Annual Conference 2024

Skills

Simulation
Ansys Fluent (CHT, battery ECM, VOF), PyFluent, Icepak, COMSOL, OpenFOAM, Simscape Fluids / Simulink, EnergyPlus, Flotherm
Design
CadQuery, SolidWorks, SpaceClaim, design for additive manufacturing (AlSi10Mg, Cu, GrCop42), TPMS lattices
Modeling and ML
Reduced-order flow-network models, Gaussian processes, active learning (BoTorch), POD surrogates, scikit-learn, PyTorch, system identification
Experimental
Single-phase calorimeter-bar loops, two-phase immersion rigs, Arbin battery cycling, in-situ junction temperature via R_ds(on), IR thermography, PIV, Keysight / NI DAQ, LabVIEW
Programming
Python (numpy, scipy, pandas, matplotlib), MATLAB, C/C++, LaTeX, git