Development of fast response heat transfer measurement technique with thin-film thermocouples
Development of fast response heat transfer measurement technique with thin-film thermocouples
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DOI：
10.1016/j.ijheatmasstransfer.2020.120331
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发表时间：
2020-12-01
影响因子：
5.2
通讯作者：
Monde, Masanori
中科院分区：
文献类型：
--
作者：
Liu, Yang;Mitsutake, Yuichi;Monde, Masanori
在高于莱登弗罗斯特温度的高温固体上的过渡沸腾具有很强的不稳定换热特性。这种不稳定的现象导致固体表面下的温度迅速变化，导致时间上的重复，以及表面上的湿和干空间。因此，发展一种快速测温技术对于理解这种转变现象是必不可少的。所研制的温度传感器与直径为PHi 0.32 mm的铬合金细丝端面连接，其位置与厚度为5 mm的镍片表面相距3微米，可在100 kHz内快速跟踪温度变化。通过对一维非稳态导热的反问题分析，可以从测量到的温度计算出热传递。此外，在固着乙醇液滴撞击热表面的实验中，计算的热流密度也足以捕捉到非稳态沸腾换热的特征。(C)2020爱思唯尔有限公司。保留所有权利。
A transition boiling on a high temperature solid beyond the Leidenfrost temperature is characterized by a strong unstable heat transfer. This unstable one brings a rapid temperature change beneath the surface in the solid and causes a repetition in time as well as a space of wet and dry on the surface. Therefore, the development of a fast temperature measurement technique is indispensable to understand this transition phenomenon. The developed temperature sensor has a junction of the end face of chromel fine wire of phi 0.32 mm diameter, whose position is 3 mu m away from the surface of nickel disk of 5 mm thickness and can follow a rapid temperature change within 100 kHz. The heat transfer can be calculated from the measured temperature by using an inverse problem analysis for one-dimensional unsteady heat conduction. Besides, the calculated heat flux is also confirmed to be sufficient to capture the characteristics of unsteady boiling heat transfer in the experiment that a sessile ethanol droplet impacts onto the hot surface. (C) 2020 Elsevier Ltd. All rights reserved.