摘要
采用Solid Works建立了水滴型缠绕管式换热器的物理模型,利用Fluent流场模拟软件,考察了不同入口流速下的水滴型管与圆管换热器壳侧流动和传热性能。结果表明:与圆管换热器相比,水滴形管换热器由于换热管截面流线型结构的导流作用,流体在壳程内压力分布更均匀,壳程阻力较小,降低了缠绕管式换热器壳程的压降。水滴形管的阻力系数和压降较圆管大幅度减小,当入口流速为0.4m/s时,水滴形管的努塞尔数是圆管的94.2%,而其阻力系数只有圆管的75%,PEC指数提高了5%,研究工作可为新型换热器的开发与设计提供指导。
This paper, taking advantage of SolidWorks, set up drop shape heat exchanging tubes of coil-wound heat exchanger, using Fluent to investigate the influence on the flow at shell sides and heat transfer performance which caused by the change of heat exchanger tube arrangements and the inlet flow velocity.Compared with the circular tube heat exchanger, the water drop tube heat exchanger thanks to the heat transfer tube section of the streamlined structure of the diversion of the fluid in the shell within the pressure distribution is more uniform, shell resistance is smaller, reducing the tube heat exchanger and the pressure drop of the shell.The results indicates that, At the shell side, although the Nu of the heat exchanger of the drop tube has a certain decrease, the resistance coefficient f and the pressure drop are greatly reduced.When the inlet flow rate is 0.4m/s, the Nusselt number Nu of the drop tube is 94.2% of the pipe, and its resistance coefficient f is only 75% of the tube, PEC index increased by 5%, greatly reduced due to Shell pressure loss caused by resistance.
出处
《化工设计通讯》
CAS
2017年第7期147-149,151,共4页
Chemical Engineering Design Communications
基金
国家自然科学基金(21276132)
青岛市科技成果转化计划-科技惠民专项(城市发展)(编号16-6-2-50-nsh)
关键词
传热
数值模拟
水滴型管
heat transfer
numerical simulation
drop shape heat exchanging tubes
