INVESTIGATION OF CONVECTION HEAT TRANSFER FOR HIGH INTEGRAL FINNED TUBE HEAT EXCHANGER

Abstract

The numerical investigation has been performed in this work to evaluate the performance of a triangular finned tube heat exchanger. In numerical work, the effect of space (2.5, 3 and 3.5 mm) distance between every two finned shaped and the volumetric flow rate on the heat transfer coefficient are examined consisting of cold water loop, hot air loop and the test section which is a concentric parallel flow double pipe heat exchanger. Coldwater and hot air are used as working fluids in the tube side and shell side, respectively. water at Reynold's numbers ranging from (3019.892 to 8035.044 ) flows through the inner tube. The inlet cold water temperatures are (45, 35, 25 and15) oC respectively. Numerical simulation has been carried out on the present heat exchangers to analyze both flow field and heat transfer using ANSYS, FLUENT15 computational fluid dynamic (CFD) package model. The finned tubes provide higher Nusselt numbers than the smooth tube. In the less pitch (p=2.5mm) compared with other pitches.