Study on Flow Heat Transfer Performance of Folded Segmental Baffle Heat Exchanger
In order to enhance the heat transfer performance of the baffle heat exchanger,the bending angle and the spacing of the baffle heat exchanger were changed,and the fluid flow in the heat exchanger shell and heat transfer process were simulated by using ANSYS Fluent software,and the effects on the pressure,velocity and temperature of the fluid flow in the heat exchanger shell were analyzed under dif-ferent bending angles of 110°,135°,170° and 180°,baffle spacings of 250,300 and 350 mm and Reynolds numbers of 10 000,20 000 and 50 000.The results show that increasing the Reynolds number has a great effect on improving the dead zone of the flow,and the dead zone of the flow when the Reyn-olds number is 50 000 has a greater area reduction compared with the Reynolds number of 10 000;with the decrease of the angle,the dead zone area on the baffle backflow side of the fluid flow is gradually re-duced,the greater the heat exchanger surface heat transfer coefficient,the greater the inlet and outlet pressure drop.When the angle is 110°,the outlet temperature is minimum,and the inlet and outlet pres-sure drops are maximum;when the angle is 135°,the performance evaluation criteria(PEC)is maxi-mum,and the overall performance of the heat exchanger is optimal;the baffle spacing increases,the pressure change gradient decreases,the differential pressure change am-plitude decreases,the outlet temperature change in the shell is not proportional to the spacing,and the outlet temperature is the lowest when the spacing is 300 mm.
NETL
NSTL
万方数据
