微翅片管内两相流空隙率的实验研究

S. Koyama, Yongchang Chen, Ryu-ichi Kitano, K. Kuwahara
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引用次数: 6

摘要

本文对纯制冷剂HFC134a微翅片管内两相流的空隙率和流型进行了实验研究。实验在0.6和1.2MPa的压力范围内进行,质量速度分别为90和180kg/m^2 s,其中蒸汽质量在0 ~ 1之间变化。在绝热条件下,通过同时关闭试管两侧阀门来测量空隙率。对微翅片管的实验结果进行了对比。结果表明,微鳍管的实验数据低于光滑管的相关系数预测结果。作为试验,在现有实验结果的基础上,提出了经验相关性。通过视镜对流型进行了观察,并用相机进行了观测。观测结果与修正后的贝克图进行了比较。
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Experimental study on void fraction of two-phase flow inside a micro-fin tube
In this paper the void fraction and flow pattern of the two-phase flow in a micro-fin tube were investigated experimentally for a pure refrigerant HFC134a. The experiment was carried out at a pressure range of 0.6 and 1.2MPa with mass velocities of 90 and 180kg/m^2 s, in which the vapor quality varied from 0 to 1. The void fraction was measured by means of simultaneously closing valves of both sides of the test tube at adiabatic condition. Experimental results for the micro-fin tube were compared with previous correlations for smooth tube. It was found that experimental data of the micro-fin tube were lower than predicted results using correlations for smooth tube. As a trial, an empirical correlation was proposed, based on the present experimental results. The observation of the flow pattern through a sight glass was also carried out with a camera. The observation results were compared with modified Baker's map.
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