方形和矩形截面通道内两相换热特性的实验研究

Experimental Study on Heat Transfer Characteristics of Two-phase Flow in Square and Rectangular Channels

微热沉、微通道换热器等非圆形截面流动通道中的泰勒流由于强化换热的特性受到了广泛的关注。本文在恒定热流密度边界下,以空气和水为工质对4 mm×4 mm,5 mm×3 mm截面水平管道进行了气液两相流换热特性实验研究。讨论了不同入口气体、液体入口雷诺数和液塞长度对方管和矩形管壁面温度和努塞尔数的影响。结果表明:液相雷诺数和气相雷诺数对方管和矩形管两相换热系数的影响有部分差异。本文结果为微通道换热器的设计和矩形管及方形管泰勒流的换热数学模型的建立提供了参考。

Taylor flow in non-circular cross-section flow channels such as micro-heat sinks and micro-channel heat exchangers has received extensive attention due to its heat-enhancing properties.In this paper,under the boundary of constant heat flux density,air and water are used as working fluids to conduct an experimental study on the heat transfer characteristics of gas-liquid two-phase flow in horizontal pipes with cross-sections of 4 mm×4 mm and 5 mm×3 mm.The effects of different inlet gas and liquid inlet Reynolds numbers and liquid slug lengths on the wall temperature and Nusselt number of tubes and rectangular tubes are discussed.The results show that there are some differences between the liquid phase Reynolds number and the gas phase Reynolds number on the heat transfer coefficient of the rectangular tube and the rectangular tube.The results of this paper provide a reference for the design of microchannel heat exchangers and the establishment of mathematical models for heat transfer of rectangular and square tubes Taylor flow.