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首页> 外文期刊>International Journal of Multiphase Flow >Theoretical and experimental study of wavy flow during R134a condensation flow in symmetrically and asymmetrically cooled microchannels
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Theoretical and experimental study of wavy flow during R134a condensation flow in symmetrically and asymmetrically cooled microchannels

机译：对称和不对称冷却微通道R134A冷凝流动期间波浪流动的理论与实验研究

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The paper presents experimental and theoretical studies of wavy flows during R134a condensation in oval parallel microchannels with a hydraulic diameter of 301.6 mu m for mass fluxes from 60 to 250 kg/(m(2)s) and vapor mass qualities from 0.1 to 0.9. The inlet saturation temperature of R134a is 31.3 degrees C. Waves were seen in the thin liquid film and in the channel corners with measurements of their wave lengths and velocities. The results show that both the film wave length and the corner wave length increase with decreasing mass flux and decreasing vapor mass quality. Additionally, the film wave velocity and corner wave velocity both increase with increasing mass flux. The cooling method, either asymmetric cooling or symmetric cooling, only affected the corner wave length and velocity along the channel except near the inlet. A two-dimensional theoretical model was developed to predict the liquid-vapor interface instability conditions during condensation flow by neglecting the liquid inertia and vapor flow viscous terms. The normal modes method was used to analyze the system instability reactions to various perturbation wave lengths. Two modes were obtained with one giving the greatest instability wave length which agrees well with the measured wave length data. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文介绍了在椭圆形平行微通道中的R134A缩合期间波浪流的实验和理论研究，其液压直径为301.6μm，质量通量为60至250kg /（m（2）s），蒸气质量为0.1至0.9。 R134a的入口饱和温度是31.3摄氏度。在薄的液体膜中和沟道拐角中看到波，具有它们的波长和速度的测量。结果表明，薄膜波长和角波长度随着质量磁通量的降低和蒸汽质量质量而增加。另外，膜波速度和角波速度随着质量磁通量的增加而增加。除了靠近入口附近，冷却方法仅影响沿着通道的角波长和速度影响。开发了一种二维理论模型，以通过忽略液体惯性和蒸汽流粘性术语来预测冷凝流动期间的液态蒸汽接口不稳定条件。正常模式方法用于分析对各种扰动波长的系统不稳定性反应。获得两种模式，其中给出了最大的不稳定波长，这与测量的波长数据吻合良好。 （c）2018年elestvier有限公司保留所有权利。

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