A fish fin-shaped vortex generator was proposed and applied to heat transfer enhancement of fin-and-tube heat exchanger.The effects of vortex generator installation on flow and heat transfer in heat exchangers were studied using numerical simulation methods,and the pressure changes before and after the fluid flow through the vortex generator were analyzed.The results showed that when the vortex generator was installed downstream of the circular tube in a common-flow-up manner,the heat transfer j factor increased by 46.6%,and the friction factor increased by 24.4%.Compared with installing the vortex generator in a common-flow-down configuration upstream of a circular tube,installing it in a common-flow-up configuration downstream of the tube resulted in a smaller negative pressure zone behind the tube,lower flow resistance,and the mixing effect of hot and cold fluids was better,so it had a better enhanced heat transfer effect.
关键词
管翅式换热器/鱼鳍型涡发生器/强化传热
Key words
Fin-and-tube heat exchanger/Fish fin-shaped vortex generator/Enhanced heat transfer
维普
万方数据