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首页> 外文期刊>International Journal of Heat and Mass Transfer >Microscale study of mechanisms of heat transfer during flow boiling in a microchannel
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Microscale study of mechanisms of heat transfer during flow boiling in a microchannel

机译：微观研究微通道内流动沸腾过程中的传热机理

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摘要

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.
机译：这项研究研究了微通道中FC-72流动沸腾过程中传热事件的微观物理现象。此处介绍的实验结果提供了有关气泡生长和流过微通道期间传热过程性质的新的物理见解。通过开发一种具有复合加热壁的设备，可以实现这项研究，该复合壁由高导热率的基板组成，该基板上覆盖有一层低导热率的材料，并带有嵌入式温度传感器。这种新颖的布置使得能够以40-65μm的空间分辨率和50μs的时间分辨率计算局部热通量。该设备从直径为300 nm的人造腔中产生隔离的气泡，该人造腔是在脉冲功能微型加热器的中心制造的。对温度和热通量数据以及气泡同步图像的分析表明，随着气泡的增长和流过通道的传热，四种传热机制是活跃的。这些传热机制是（1）微层蒸发，（2）线间蒸发，（3）瞬态传导和（4）微对流。这些机理的细节，包括它们的活化时间以及相应的表面热通量和传热系数，被广泛讨论。

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