CFD and experimental studies on the performance of the modified twisted tape tube inserts

CFD and experimental studies on the performance of the modified twisted tape tube inserts

This paper reports experimental and Computational Fluid Dynamics (CFD) studies on using modified types of a twisted tape tube insert. The experimental rig was a bended tube carrying hot water at various Reynolds number from 2000 to 12000 which placed in a cold bath. The inlet -outlet temperatures and pressures of water across the tube equipped with a classic, perforated and notched twisted tape inserts as well as the plain tube were measured. A CFD modeling was carried out to study the observed differences in the performances of these modified inserts. The heat transfers from the tube equipped with these inserts, which have new geometries, were compared with that of classic twisted tape. A criterion was presented for quantifying the heat transfer performance of these inserts. The CFD and the experimental results both confirm that the new geometries of insert can not increase the the heat transfer performance.