摘要
为研究波形对波纹板换热性能产生的影响,建立了不同波高下的三角形、正弦形波纹板间通道的局部三维模型,通过数值模拟得到了各通道不同工况下的努塞尔数Nu和摩擦因子f,并对不同参数波纹板的Nu和f进行了比较。同时,文中引入了二次流强度概念,将其改进为适用于波纹板间通道换热情景的平均壁面涡强概念,定量分析了平均壁面涡强与Nu的关系。研究结果表明:平均壁面涡强与Nu间存在定量对应关系,同样情况下,大波高的三角形波纹通道有着更大的Nu,f和壁面平均涡强;而通过牺牲阻力来增强波纹通道内漩涡强度进一步增强换热,是一个随阻力增大收益逐渐降低的过程。
In order to study the influence of wave shape on the heat transfer performance of corrugated plates,a local three-dimensional model of the channel between triangular and sinusoidal corrugated plates with different wave height was established.The Nusselt number(Nu)and friction factor(f)of each channel under different working conditions were obtained by numerical simulation,and the Nu and f of corrugated plates with different parameters were compared.In addition,the concept of secondary flow intensity was introduced in this paper,which was improved to the concept of average wall vortex intensity applicable to the heat exchange situation of corrugated plate channels.The relationship between the average wall vortex intensity and Nu was quantitatively analyzed.The results show that there is a quantitative relationship between the average wall vortex intensity and Nu.In the same case,the triangle corrugated channel with large wave height has greater Nu,f and average wall vortex intensity.However,to further enhance heat exchange by increasing the intensity of vortices in corrugated channels at the expense of resistance is a process in which the revenue decreases gradually with the increase of resistance.
作者
吕国政
张引弟
路达
刘梅梅
LYU Guo-zheng;ZHANG Yin-di;LU Da;LIU Mei-mei(College of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2020年第8期63-67,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(51974033)
中国石油科技创新基金资助项目(2015D-50-06-0603)
长江青年科技创新团队基金资助项目(2015cqt01)。
关键词
板式换热器
人字形波纹板
二次流强度
强化换热
数值模拟
plate heat exchanger
herringbone corrugated plate
secondary flow intensity
enhanced heat exchanger
numerical simulation
