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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on two-phase flow pressure drop during ethanol-water vapor mixture condensation in microchannels
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Experimental study on two-phase flow pressure drop during ethanol-water vapor mixture condensation in microchannels

机译：微通道乙醇水蒸气混合气冷凝过程中两相流压降的实验研究

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摘要

Ethanol-water vapor mixtures condensation shows different flow patterns in microchannels due to the equivalent surface free energy differences. The transition point of streak flow pattern was introduced in the paper which was found closely related to the frictional pressure drop of ethanol-water vapor mixtures condensation flow in microchannels. Characteristics of two-phase pressure drop for ethanol-water vapor mixtures condensation flow in silicon microchannels of streak and smooth annular flow pattern were investigated. Four types of multi-port trapezoidal and triangular microchannels with hydraulic diameter in the range of 126-155 mu m were employed. The pressure drop was determined under steam mass flux between 259.2 and 504.8 kg m(-2) s(-1) when the inlet ethanol weight concentration varied from 1% to 60%. The experimental pressure drop results were compared with existing correlations of flow condensation. The transition point basing on the streak flow pattern of binary vapor condensation was proposed to replace the traditional Reynolds number criterion of the laminar flow state to turbulent flow state for the frictional factor and the C parameter for Kim and Mudawar's universal pressure drop model, which is in good agreement with the results the experiment results. (C) 2018 Elsevier Ltd. All rights reserved.
机译：由于等效的表面自由能差异，乙醇-水蒸气混合物的冷凝在微通道中显示出不同的流动模式。本文介绍了条纹流型的转变点，发现其与微通道中乙醇-水蒸气混合物凝结流的摩擦压降密切相关。研究了乙醇-水蒸气混合物在条纹硅微通道中的冷凝水两相压降特性和平滑的环形流型。使用了四种类型的水力直径在126-155微米范围内的多端口梯形和三角形微通道。当入口乙醇重量浓度从1％更改为60％时，在蒸汽质量通量为259.2至504.8 kg m（-2）s（-1）下确定压降。将实验压降结果与流动冷凝的现有相关性进行了比较。提出了基于二元蒸汽凝结的条纹流型的过渡点，以代替传统的层流状态的雷诺数准则，以Kim和Mudawar的通用压降模型的摩擦因数和C参数为湍流状态。与实验结果吻合良好。 （C）2018 Elsevier Ltd.保留所有权利。

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