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INFLUENCE OF LONGITUDINAL HEAT CONDUCTION EFFECTS IN A HEAT SINK OVER THE THERMAL CREEP IN A MICROCHANNEL: CONJUGATE HEAT TRANSFER MECHANISM

卷 50, 册 9, 2019, pp. 899-920
DOI: 10.1615/HeatTransRes.2018025932
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摘要

In this work, we use asymptotic and numerical techniques to analyze the conjugated heat transfer between a rarified gas flow and the lower wall of a thin horizontal microchannel exposed to a uniform heat flux, when the laminar motion of the gas is only caused by the thermal creep or transpiration effect on the lower wall of the microchannel. The surface temperature of the lower wall is unknown and must be determined as a part of the problem. Therefore, we can assume that the lower face of this heat sink with finite values of the thermal conductivity and thickness is exposed to a uniform heat flux, while the upper wall of the microchannel is subjected to a prescribed thermal boundary condition. The resulting governing equations are written in dimensionless form, assuming that the Reynolds number associated with the characteristic velocity of the thermal creep and the aspect ratio of the microchannel, are both very small. The velocity and temperature profiles of the gas phase and the temperature profile of the solid wall are determined as functions of the involved dimensionless parameters, and the predictions clearly confirm the influence of the conjugate thermal mechanism.

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对本文的引用
  1. Monsivais Ian, Méndez Federico, Gomez Ares, Lizardi José, Conjugate Heat Transfer in a Thin Microchannel Filled with a Porous Medium, Journal of Thermophysics and Heat Transfer, 36, 1, 2022. Crossref

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