基于改进稳态热丝法的微丝对流换热特性研究

Xiaoman Wang, Rulei Guo, Qinping Jian, Guilong Peng, Y. Yue, Nuo Yang
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引用次数: 3

摘要

MEMS在空气环境下工作时,对流在传热中起着非常重要的作用。然而,传统的对流换热系数的测量需要导热知识,这使得测量变得复杂。本文提出了一种改进的稳态“热丝”(MSSHW)方法,该方法可以在不知道热导率的情况下测量微丝对流换热系数。为了验证MSSHW方法,在大气中测量了铂微丝的对流换热系数,其值与传统测量方法和经验方程的值吻合较好。然后用MSSHW测量了不同材料和直径微丝的对流换热系数。研究发现,微丝的对流换热系数对材料不敏感,随着微丝直径从120 ${\mu}$m减小到20 ${\mu}$m,微丝的对流换热系数从86 W/(m$^2$K)增大到427 W/(m$^2$K)。在不知道微丝热导率的情况下,MSSHW方法提供了一种更方便的方法来测量对流效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal Characterization of Convective Heat Transfer in Microwires Based on Modified Steady State “Hot Wire” Method
The convection plays a very important role in heat transfer when MEMS work under air environment. However, traditional measurements of convection heat transfer coefficient require the knowledge of thermal conductivity, which makes measurements complex. In this work, a modified steady state "hot wire" (MSSHW) method is proposed, which can measure the heat transfer coefficient of microwires' convection without the knowledge of thermal conductivity. To verify MSSHW method, the convection heat transfer coefficient of platinum microwires was measured in the atmosphere, whose value is in good agreement with values by both traditional measurement methods and empirical equations. Then, the convection heat transfer coefficient of microwires with different materials and diameters were measured by MSSHW. It is found that the convection heat transfer coefficient of microwire is not sensitive on materials, while it increases from 86 W/(m$^2$K) to 427 W/(m$^2$K) with the diameter of microwires decreasing from 120 ${\mu}$m to 20 ${\mu}$m. Without knowing thermal conductivity of microwires, the MSSHW method provides a more convenient way to measure the convective effect.
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