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Saptarshi Joshi

Ph.D. candidate · University of Illinois Urbana-Champaign · Energy Transport Research Laboratory

Making hot silicon cold, and explaining exactly how.

I design, build and model the cooling that keeps 10 kW-class GPUs, megawatt racks and EV batteries inside their thermal limits: manifold cold plates, printed copper, boiling immersion, and the first chip-to-ambient transient model of a liquid-cooled AI rack.

↑ the field above is a live heat-diffusion solve. Move your cursor to add heat; the coolant sweeps it away.

208

W/cm²

heat flux removed, GaN cooler, measured

1.6 × 10⁶

COP

cooling coefficient of performance

126

chips

in one transient rack model, chip to ambient

10 kW

target

per package, the next design problem

Research

Four problems, one thread: move heat out of the places it is hardest to reach.

Selected publications

Peer-reviewed, measured, reproducible.

  1. 2026
    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

    A hotspot-aware, Pareto-optimized copper manifold microchannel cooler cuts pressure drop by 70–98 % and thermal resistance by 19–26 % versus the baseline, removes 208 W/cm² from a six-device GaN board, and reaches a cooling COP of 1.6 × 10⁶, with CFD within 3 % of experiment.

  2. 2026
    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

    First-author chapter with 3D Systems on printing a copper cold plate as one part, with wavy microchannels no machine tool can cut, and testing it on a GPU-class heat load. In revision after reviewer round one.

  3. 2026
    Immersion-cooled 1U power supply unit for fanless, warm-liquid-cooled data centers

    Applied Thermal Engineering 303, 132309

    Removing the last fans from a liquid-cooled rack: a 1U power supply immersed in dielectric fluid and cooled by the warm facility water loop.

Now

Graduating by 2028. Looking for the hardest thermal problems in industry.

Presenting at ASME InterPACK 2026 in San Diego (paper 188693, advanced liquid cooling for high-power electronics).

Writing up the rack-scale dynamic system model and finishing the ML-assisted manifold cold plate design campaign.

Interested in data-center thermal management, semiconductor packaging thermal, and EV thermal systems.

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