THEORETICAL STUDY OF HEAT TRANSFER ENHANCEMENT IN PIPE WITH POROUS BODY

摘要

A theoretical investigation of the fluid flow and heat transfer in a pipe with porous body of high porosity twis- ted by metal wire was carried out. A theoretical model of a circular pipe with porous matrix attached at the channel wall and extended inward the centerline was set up. Through ana- lyzing the flow in the porous matrix by the Brinkman-extend- ed-Darcy equation and through including the effect of disper- sion by adding the dispersion coefficient into the energy equa- tion, the theoretical solutions of velocity distribution and tem- perature fields were obtained. Finally the effect of the proper- ties of the porous matrix on the flow and heat transfer in the porous body was studied, which indicates that dispersion can really enhance the heat transfer in pipe.