A Review On Double Pipe Heat Exchangers Using Corrugations
Keywords:
Computational Fluid Dynamics (CFD), heat transfer, heat exchanger, pressure drop, Convective heat transfer coefficient, Corrugated heat exchanger.Abstract
The paper presents a brief of the experimental work carried out on enhancing the performance of heat exchangers. Research is being carried out to increase the efficiency of heat exchange using by using a mix of different fluids. Further, the flow pattern through the heat exchangers has been given attention to enhance the wetting area of the fluid with solid components of the heat exchanger. In addition, micro-heat exchangers developed till date employ twisted tape inserts, baffles and fins to add to the surface area of the heat exchangers still keeping the effective dimensions of the heat exchangers to be low. Effect of external cone rings in various
orientations on the heat transfer performance are also studied. Owing to their limited space occupation and compact size double pipe heat exchangers are reviewed as a possible solution to augment the heat transfer performance of heat exchangers by various active as well as passive techniques. One of the techniques that is providing corrugation on the tube walls is studied. The effects of varying the various geometric parameters of corrugated tubes viz. their depth, pitch, orientation, diameter is reviewed. Possibilities of employing corrugations on both inner and outer tubes were exploited as well as the effects of providing a convex and concave corrugation
alternatively along the tube length were also analyzed effects of flow parameters on the heat transfer and pressure drop in the pipes were also studied. The possibility of exploiting CFD techniques and the results obtained thereof were considered. The effects of flow parameters and geometric variations in pipes on various dimensionless numbers and factors were studied.
