制冷技术2016，Vol.36Issue(4)：29-35,7.DOI:10.3969/j.issn.2095-4468.2016.04.106
印刷电路板式换热器Z型通道内制冷剂流动冷凝特性的数值模拟
Numerical Simulation of Refrigerant Flow Condensation Characteristics in Zigzag Channel of Printed Circuit Heat Exchanger
摘要
Abstract
The application of printed circuit heat exchanger (PCHE) with zigzag channels in liquefied natural gas (LNG) becomes more and more extensively. The required prerequisites for optimizing PCHE is to know the flow condensation characteristics of refrigerant flow condensation in zigzag semicircular channels. In the present study, a numerical model of two-phase flow condensation in zigzag semicircular channels was developed and validated by the existing experiment data. Based on the validated model, the flow patterns of refrigerant in zigzag channel under different conditions were obtained and compared with the existing flow map of R134a for circular tube. The comparison shows that, the annular flow region of flow condensation is expanded and the transformation from stratified flow to annular flow is promoted; the heat transfer coefficient inside tube increases with the decreasing vapor quality. The heat transfer coefficient under slug flow conditions is the largest, followed by the annular and stratified flow conditions. The results can be the theoretical foundation of zigzag channel design in PCHEs.关键词
印刷电路板式换热器/冷凝/液化天然气/数值模拟/Z型半圆通道Key words
Printed circuit heat exchanger/Condensation/Liquefied natural gas/Numerical simulation/Zigzag semicircular channel引用本文复制引用
赖展程,李剑锐,胡海涛,庄大伟,翁晓敏,丁国良..印刷电路板式换热器Z型通道内制冷剂流动冷凝特性的数值模拟[J].制冷技术,2016,36(4):29-35,7.基金项目
国家自然科学基金（No.51576122），上海市优秀学术带头人计划项目（No.16XD1401500）。 （）
