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首页> 外文期刊>International Journal of Heat and Mass Transfer >Liquid film thicknesses of oscillating slug flows in a capillary tube
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Liquid film thicknesses of oscillating slug flows in a capillary tube

机译：振荡塞的液膜厚度在毛细管中流动

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摘要

Liquid film thickness is an important parameter for predicting boiling and condensation heat transfer coefficients in a microscale slug flow. In the present study, liquid film thickness of oscillating slug flow in a capillary tube is experimentally investigated under adiabatic condition. Laser focus displacement meter is used to measure the initial liquid film thickness. Circular tube with inner diameter of 1 mm is used for the test tube, and water and ethanol are used as working fluids. Measurement is carried out using a capillary tube with one open end and the other connected to a stepping motor. Driving frequency is ranged from 1 to 10 Hz at equivalent slug stroke of 31.7 mm and 51.2 mm. As the frequency and equivalent slug stroke are increased, the liquid film thickness deviates from that in the steady condition and becomes thinner or thicker under flow acceleration or deceleration, respectively. The empirical correlations for the initial liquid film thickness under acceleration and deceleration conditions proposed in the previous study (Youn et al., 2015, 2016) well predict the liquid film thicknesses of the oscillating flows within 15% accuracy. (C) 2018 Elsevier Ltd. All rights reserved.
机译：液膜厚度是用于预测微尺度团状流中沸腾和冷凝传热系数的重要参数。在本研究中，在绝热条件下，通过实验研究了毛细管中的振荡塞流的液膜厚度。激光聚焦位移计用于测量初始液膜厚度。试管使用内径为1 mm的圆形管，水和乙醇用作工作流体。使用毛细管进行测量，毛细管的一端开口，另一端连接到步进电机。在31.7 mm和51.2 mm的等效弹头行程时，驱动频率的范围为1到10 Hz。随着频率和等效塞行程的增加，液膜厚度偏离稳态时的液膜厚度，并且在流动加速或减速时分别变薄或变厚。先前研究（Youn et al。，2015，2016）提出的在加速和减速条件下初始液膜厚度的经验相关性很好地预测了振荡流的液膜厚度在15％的精度范围内。 （C）2018 Elsevier Ltd.保留所有权利。

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