扰流结构微通道流动沸腾换热特性的数值研究  

Numerical Study on Heat Transfer Characteristics of Flow Boiling in Microchannel With Turbulence Structure

作　　者：郭勇 朱传勇 郭雯 丁斌 段欣悦[1] 巩亮[1] GUO Yong;ZHU Chuanyong;GUO Wen;DING Bin;DUAN Xinyue;GONG Liang(College of New Energy,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)新能源学院,青岛266580

出　　处：《工程热物理学报》2022年第5期1296-1303,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51676208);中央高校基本科研业务费专项资金(No.18CX07012A)。

摘　　要：本文基于VOF模型和等温相变模型构建了三维微通道流动沸腾模型,并对布置扰流结构微通道的流动沸腾换热特性进行数值模拟,研究了微通道气泡流动形态,分析了扰流结构高度和入口速度对流动沸腾换热特性的影响规律。研究表明,扰流结构通过改变流向增加扰动,能够显著提高微通道的换热能力,换热系数随扰流结构高度的增加先增大后减小,壁面平均温差则相反;随着入口速度的增大,对流换热系数也变大,并且当入口速度较小时易出现因气泡堵塞通道而造成局部壁温过高的情况。Based on the VOF model and phase change model, the 3D model of flow boiling in the microchannel with turbulence structure is built. The heat transfer characteristics of flow boiling in the microchannel are numerically simulated to study the bubble dynamics, and the impact of turbulence structure height and inlet velocity on the thermal-hydraulic performance of flow boiling.The results show that the turbulence structure enhances the disturbance by changing the direction of flow, and then significantly improves the heat transfer performance of the microchannel. The heat transfer coefficient first increases and then decreases with the increase of the height of the turbulence structure, while the average wall temperature difference is on the contrary. With the increase in the inlet velocity, the convective heat transfer coefficient also increases, and when the inlet velocity is small, it will lead to the high local wall temperature because of the bubble blocking the microchannel.

关 键 词：微通道 流动沸腾 强化换热 扰流结构 

分 类 号：TK124[动力工程及工程热物理—工程热物理]