Microscale sets a fundamental limit to heat transfer

Barak Kashi; Herman D. Haustein

doi:https://doi.org/10.1016/j.icheatmasstransfer.2019.02.003

Microscale sets a fundamental limit to heat transfer

Barak Kashi, Herman D. Haustein

School of Mechanical Engineering

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

Classical heat transfer relations, claiming continual increase of cooling with downscaling, contradict previous experimental findings. We show that the reemergence of viscous dissipation at the microscale breaks heat transfer's symmetry and heat flux independence – the first such analysis for microjets. We also find that all bounded flows have maximal attainable cooling rates, corresponding to scale-down limits, given by a critical value of a new dimensionless group. While macro- and micro- dissipation are similar, their parameter ranges differ with jets introducing additional dependencies. This new micro-cooling performance envelope curbs the ongoing trend of flow miniaturization.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	International Communications in Heat and Mass Transfer
Volume	104
DOIs	https://doi.org/10.1016/j.icheatmasstransfer.2019.02.003
State	Published - May 2019

Keywords

Channels
Convective heat transfer
Jets
Microscale
Scale-down limit
Viscous dissipation

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
General Chemical Engineering
Atomic and Molecular Physics, and Optics

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https://doi.org/10.1016/j.icheatmasstransfer.2019.02.003

Cite this

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title = "Microscale sets a fundamental limit to heat transfer",

abstract = "Classical heat transfer relations, claiming continual increase of cooling with downscaling, contradict previous experimental findings. We show that the reemergence of viscous dissipation at the microscale breaks heat transfer's symmetry and heat flux independence – the first such analysis for microjets. We also find that all bounded flows have maximal attainable cooling rates, corresponding to scale-down limits, given by a critical value of a new dimensionless group. While macro- and micro- dissipation are similar, their parameter ranges differ with jets introducing additional dependencies. This new micro-cooling performance envelope curbs the ongoing trend of flow miniaturization.",

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year = "2019",

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T1 - Microscale sets a fundamental limit to heat transfer

AU - Kashi, Barak

AU - Haustein, Herman D.

PY - 2019/5

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N2 - Classical heat transfer relations, claiming continual increase of cooling with downscaling, contradict previous experimental findings. We show that the reemergence of viscous dissipation at the microscale breaks heat transfer's symmetry and heat flux independence – the first such analysis for microjets. We also find that all bounded flows have maximal attainable cooling rates, corresponding to scale-down limits, given by a critical value of a new dimensionless group. While macro- and micro- dissipation are similar, their parameter ranges differ with jets introducing additional dependencies. This new micro-cooling performance envelope curbs the ongoing trend of flow miniaturization.

AB - Classical heat transfer relations, claiming continual increase of cooling with downscaling, contradict previous experimental findings. We show that the reemergence of viscous dissipation at the microscale breaks heat transfer's symmetry and heat flux independence – the first such analysis for microjets. We also find that all bounded flows have maximal attainable cooling rates, corresponding to scale-down limits, given by a critical value of a new dimensionless group. While macro- and micro- dissipation are similar, their parameter ranges differ with jets introducing additional dependencies. This new micro-cooling performance envelope curbs the ongoing trend of flow miniaturization.

KW - Channels

KW - Convective heat transfer

KW - Jets

KW - Microscale

KW - Scale-down limit

KW - Viscous dissipation

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DO - https://doi.org/10.1016/j.icheatmasstransfer.2019.02.003

M3 - مقالة

SN - 0735-1933

VL - 104

SP - 1

EP - 7

JO - International Communications in Heat and Mass Transfer

JF - International Communications in Heat and Mass Transfer

ER -

Microscale sets a fundamental limit to heat transfer

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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