通道深度对超临界流体在微细通道内的流动换热性能影响  

The Influence of Channel Depth on the Flow and Heat Transfer Performance of Supercritical Fluid in Microchannels

作　　者：陈佳敏 唐凌虹 Chen Jiamin;Tang Linghong(New Energy College,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学新能源学院,西安710065

出　　处：《机电工程技术》2025年第4期78-84,共7页Mechanical & Electrical Engineering Technology

基　　金：陕西省自然科学基础研究计划(2023-JC-YB-350)。

摘　　要：随着海上天然气贸易的逐渐兴起,海上浮式装置对LNG气化器提出了更高的要求。印制电路板式换热器(PCHE)作为一种新型的微通道换热器,由于其高效、紧凑的特点,是LNG载体和LNG浮式接收站上低温换热器的首选。以印刷电路板式换热器的单Z型通道为研究对象,折流角15°,采用Ansys Fluent软件,研究超临界LNG在该通道内的流动换热特性,探究了不同深度的通道在不同入口速度下的对流传热系数h、努塞尔数Nu、范宁摩擦因子f、综合评价指标PEC的变化情况。结果表明:随着通道深度和入口速度的提高,h、Nu均呈现增大的趋势,f呈现减小的趋势。通过综合分析,流体流过Z型通道,产生了旋涡,使得流体的有效流动面积减小,增强了流体的扰动性,深度0.955 mm的通道,在1.05 m/s的入口速度下,有着最佳的流动换热性能。With the gradual rise of offshore natural gas trade,offshore floating devices have put forward higher requirements for LNG gasifiers.Printed circuit plate heat exchanger(PCHE),as a new type of microchannel heat exchanger,is the preferred low-temperature heat exchanger for LNG carriers and LNG floating receiving stations due to its high efficiency and compactness.The single Z-shaped channel of a printed circuit plate heat exchanger is taken as the research object,with a deflection angle of 15°.Ansys Fluent software is used to study the flow and heat transfer characteristics of supercritical LNG in this channel,and to explore the changes in convective heat transfer coefficient h,Nusselt number Nu,Fanning friction factor f,and comprehensive evaluation index PEC of channels with different depths at different inlet velocities.The results indicate that as the channel depth and inlet velocity increase,bothh andNu show an increasing trend,while f shows a decreasing trend.Through comprehensive analysis,the fluid flowing through the Z-shaped channel generates vortices,reducing the effective flow area of the fluid and enhancing its disturbance.The channel with a depth of 0.955 mm has the best flow and heat transfer performance at an inlet velocity of 1.05 m/s.

关 键 词：印刷电路板式换热器 超临界甲烷 通道深度 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]