微通道散热器热边界层传热系数的测量

2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm) Pub Date : 2016-05-01 DOI:10.1109/ITHERM.2016.7517588

Mehrdad Mehrvand, S. Putnam

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引用次数: 4

摘要

本研究描述了使用光泵探针诊断来表征微通道中发展中的热边界层中的传热系数(HTC)。我们使用各向异性时域热反射(TDTR)技术的微分形式来测量HTC作为流体流速(或雷诺数，Re)的函数。测试环境/几何结构包括单相、脱气水在矩形微通道(水力直径Dh = 480 μm)中流动，由泵浦TDTR激光束局部加热。相对于非流动(静态)流体测量的HTC，我们发现在Re ~ 1800流动的单相水的HTC增加了30%。

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Heat transfer coefficient measurements in the thermal boundary layer of microchannel heat sinks

This study describes the use of optical pump-probe diagnostics to characterize the heat transfer coefficient (HTC) in a developing thermal boundary layer in a microchannel. We use a differential form of the anisotropic time-domain thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re). The testing environment/geometry consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter Dh ≅ 480 μm) with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% increase in the HTC for single-phase water flowing at Re ~ 1800.

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2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

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