摘要
利用跨尺度T型通道实现两相流相分离可大幅度削弱相变热阻、提高弹状流相变换热性能,此气液分离调控的关键在于精准控制相分离压差。通过高速摄像以及压力测量系统同步监测T型微通道内弹状流相界面的运动以及主通道和分液支管通道的压力,定义实现液相分离的最大压差为临界压差,获得两相流流速(v_(l)=2.5~4.2 cm/s,v_(g)=2.5~6.3 cm/s)、通道尺寸(0.10、0.20和0.30 mm)对临界压差、压力波动及分液效果的影响规律;基于Ergun多孔材料内流动压降公式,以实现相分离的临界压差为依据,拟合相分离单孔结构参数设计模型,模型误差约为8%;此工作可为相分离高效相变换热器的结构设计及其工业应用提供指导。
The use of cross-scale T-type branch channel could significant reduce phase-change thermal resistance and improve the heat transfer performance of slug flows,and the key of phase-separating modulation lies in an accurate control of the pressure difference during the process.A high-speed camera monitoring system and a pressure monitoring system are used to respectively monitor the interface movement of the slug flow in the T-type microchannel and the pressures of the main and the liquid-separated channels.The maximum pressure difference achieving liquid phase separation is defined as the critical pressure difference.The effects of two-phase flow velocities(v_(l)=2.5-4.2 cm/s,v_(g)=2.5-6.3 cm/s)and channel sizes(0.10,0.20 and 0.30 mm)on the critical pressure difference,pressure fluctuation and liquid separating effects were obtained.Furthermore,based on the Ergun's equation on the flow pressure drop in monohole material and the demand of the critical pressure difference to phase separation,a mathematical design model on T-branch micro-channel and cases of two phase flow is suggested with an error of approximately 8%.This work provides guidance for the future industrial application and structural design of high-efficiency phase-separating heat exchangers.
作者
黄国庆
关朝阳
贝守航
陈宏霞
HUANG Guoqing;GUAN Chaoyang;BEI Shouhang;CHENVHongxia(Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,Beijing 102206,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing102206,China)
出处
《热科学与技术》
北大核心
2025年第4期414-424,共11页
Journal of Thermal Science and Technology
基金
国家自然科学基金资助项目(52176152)
北京市自然科学基金资助项目(3222046)。
关键词
T型微通道
弹状流
气液相分离
临界压差
数学模型
T-type microchannel
slug flow
gas-liquid phase separation
critical pressure difference
mathematical model
作者简介
第一作者:黄国庆,男,山东菏泽人,1999年生,硕士生,主要研究方向为相变换热。E-mail:hgq8267672502023@163.com;通信作者:陈宏霞,女,河北保定人,1980年生,教授,主要研究方向为多相流的流动与换热.E-mail:hxchen@ncepu.edu.cn。
