摘要
印刷电路板换热器(Printed Circuit Heat Exchanger,PCHE)是一种新型微通道换热器,其换热的高效性和集成性非常适合用于LNG接收站的中间流体换热器(IFV)中。对超临界甲烷在PCHE中的对流换热进行数值模拟,研究了质量流量、入口压力、热通量及通道形状对微通道内甲烷换热系数的影响。结果表明,表面换热系数随温度的变化先增大再减小,并在假临界温度处达到最大值;PCHE半圆形通道内的换热特性高于普通圆形通道;其换热系数随流速的增加而增加;随热流密度的增加而增加;压力对换热特性的影响与介质所处的温度区间有关。
Printed Circuit Heat Exchanger（PCHE） , a newly developed microchannel heat exchanger, is considered as a promising candidate for the intermediate fluid vaporizer （IFV） used in LNG terminal due to its high heat transfer efficiency and compactness. Three-dimensional numerical analysis is conducted to investigate heat transfer characteristics of supercritical methane flow in PCHE channel. Mass flux, inlet pressure, heat flux and the shape of the channel are set as variables. As a result, the semi-circular channel has a better performance than circular tunnel in terms of heat transfer coefficient. The results also show that the surface heat transfer coefficient peaks at the pseudo-critical point. Besides, it increases with the in- crease of mass flux and heat flux. It seems that the inlet pressure have very little effect on the surface heat transfer coefficient.
作者
李玮哲
林文胜
Li Weizhe Lin Wensheng(Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200240, Chin)
出处
《低温工程》
CSCD
北大核心
2017年第5期60-64,74,共6页
Cryogenics
关键词
印刷电路板换热器
超临界甲烷
假临界温度
换热系数
数值模拟
Printed Circuit Heat Exchanger
supercritical methane
pseudo-critical temperature
heattransfer coefficient
numerical simulation
