Thermo-Hydrodynamics Analysis of Offset Fin in Compact Heat Exchanger using ANSYS Fluent

Abstract

The Existente ffortis conceded to examine the thermal-
behavior of plain offset stripped fin used in heat exchanger. A simulation arrangement(geometry) built in the ANSYS FLUENT to test the behavior of offset fin.in our investigation only domain of fluid passed over the offset fin has to be taken for CFD analysis. Setup of the model had directed to define the thermal performance of the given HE by using offset fin. The surface of the fluid domain is the contact surface of fin. So in ideal condition for maximum heat trans fer of fin is possible when whole fin is at base temperature, therefore surface of fluid domain is to be maintained at isothermal condition. The project is based on the changing the offset of the fin for the passage of air. For different offset, the behavior of temperature variation and other thermal properties is investigated. One of the best method to improve the heat transfer of the HE used in airside is to transform the fin geometry. Mostly, Heat exchangers used in cryogenics and other thermal applications purpose like in automobiles chemical industries because fin is very cheap and good way for heat exchange. The different parameters is correlated by the thesis of Deepak Kumar Maiti, and validate its geometry by comparing different thermal behavior). For different s/t ratio the behavior of friction factor (f), colburn factor (j), nusselt number (Nu) for plain offset fin is investcaated. After this examination a new design of offset fin is come forward for enhancement of heat transfer, normally fin geometries are plain along the flow of fluid. Other CFD simulation work is carried out for fin having herringbone surface and wavy surface. Wide study has been done on fin and tube HEsover the last few years to comprehend the heat transfer phenomenon and heat transfer rate within heat exchanger and to determine the dimensionless parameters i.e. colburn factor “j”, heat transfer coefficient “h”, and the friction factor “f”. However, theoretical investigation done on design of the above mentioned fin often suffers from faults due to too much simplification because of complicated geometries and assumptions made.