ANALYSIS OF HEAT-TRANSFER REGULATION AND MODIFICATION EMPLOYING INTERMITTENTLY EMPLACED POROUS CAVITIES

The present work forms a fundamental investigation on the effects of u sing intermittently porous cavities for regulating and modifying the f low and temperature fields and therefore changing the skin friction an d heat transfer characteristics of an external surface. A general flow model that accounts for the effects of the impermeable boundary and i nertial effects is used to describe the flow inside the porous region. Solutions of the problem have been carried out using a finite-differe nce method through the use of a stream function-vorticity transformati on. Various interesting characteristics of the flow and temperature fi elds in the composite layer are analyzed and discussed in detail. The effects of various governing dimensionless parameters, such as the Dar cy number, Reynolds number, Prandtl number, the inertia parameter as w ell as the effects of pertinent geometric parameters are thoroughly ex plored. Furthermore, the interactive effects of the embedded porous su bstrates on skin friction and heat transfer characteristics of an exte rnal surface are analyzed. The configuration analyzed in this work pro vides an innovative approach in altering the frictional and heat trans fer characteristics of an external surface.