Twisted Bundle Heat Exchangers Performance Evaluation by CFD

Shell and tube heat exchanger with single twisted tube bundle in five different twist angles, are studied using computational fluid dynamics (CFD) method and compared to the conventional design withsingle segmental baffles. Effect of shell-side nozzles configurations on heat exchanger performance is studied as well. Heat transfer rate and pressure drop are the main issues investigated in the paper. The results show that, for the same shell-side flow rate, the heat transfer coefficient of heat exchangerwith twisted tube bundle is lower than that of the heat exchanger with segmental baffles while shellside pressure drop of the former is even much lower than that of the latter. The comparison of heat transfer rate per unit pressure drop versus shell-side mass flow rate shows that heat exchanger withtwisted tube bundle in both cases of vertical and tangential shell-side nozzles, have significant performance advantages over the segmental baffled heat exchanger. The performance of twisted tube bundle heat exchanger does not change dramatically with altering the tube bundle twist angle.

کلیدواژه ها:

Shell and Tube Heat Exchanger ، Twisted Tube Bundle ، Computational Fluid Dynamics ، Heat Transfer ، Pressure Drop