Microscale study of mechanisms of heat transfer during flow boiling in a microchannel
Microscale study of mechanisms of heat transfer during flow boiling in a microchannel
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微通道流动沸腾传热机理的微观研究
DOI：
10.1016/j.ijheatmasstransfer.2015.04.034
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发表时间：
2015
影响因子：
5.2
通讯作者：
Moghaddam, Saeed
中科院分区：
文献类型：
--
作者：
Bigham, Sajjad;Moghaddam, Saeed
本研究考察了FC-72在微通道内流动沸腾换热事件的微尺度物理。实验结果为研究微通道内气泡生长和流动过程中的换热过程提供了新的物理依据。这项研究是通过开发一种具有复合加热壁的设备来实现的，该设备由高导热系数衬底和嵌入温度传感器的低导热材料薄层组成。该装置能够计算空间分辨率为40-65μm，时间分辨率为50μ的局部热流密度S。该装置是在脉冲功能微加热器中心制作的直径为300 nm的人工腔中产生孤立气泡的。对温度和热流密度数据以及气泡的同步图像的分析表明，随着气泡的生长和流过通道，有四种换热机制是活跃的。这些换热机理是(1)微层蒸发，(2)层间蒸发，(3)瞬时导热，(4)微对流。详细讨论了这些机理，包括它们的活化时间和相应的表面热流密度和换热系数。
This study examines the microscale physics of heat transfer events in flow boiling of FC-72 in a microchannel. Experimental results presented here provide new physical insight on the nature of heat transfer processes during bubbles growth and flow through the microchannel. The study is enabled through development of a device with a composite heated wall that consists of a high thermal conductivity substrate coated by a thin layer of a low thermal conductivity material with embedded temperature sensors. This novel arrangement enables calculation of the local heat flux with a spatial resolution of 40–65 μm and a temporal resolution of 50 μs. The device generates isolated bubbles from a 300 nm in diameter artificial cavity fabricated at the center of a pulsed function micro-heater. Analysis of the temperature and heat flux data along with synchronized images of bubbles show that four mechanisms of heat transfer are active as a bubble grows and flows through the channel. These mechanisms of heat transfer are (1) microlayer evaporation, (2) interline evaporation, (3) transient conduction, and (4) micro-convection. Details of these mechanisms including their time period of activation and corresponding surface heat flux and heat transfer coefficient are extensively discussed.
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DOI：
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