PASSIVE SOLAR SYSTEMS. AN ANALYTICAL MODELLING OF FLOW AND HEAT TRANSFER INSIDE A POROUS MEDIUM
A compressible fluid at constant pressure and temperature passes through a porous medium to a region of higher but constant temperature and of lower constant pressure. The Klarke assumption is employed which leads to only one energy equation. The non-dimensional flow and temperature fields are obtained by solving the linearized Laplace equation inside the porous medium. It was proved that by increasing the pressure drop inside the porous medium the viscosity tends to a limiting value. For small values of fluid velocities a large temperature increase occurs on the outer porous wall. It was also concluded that for the case of constant viscosity an increase in pressure drop increases the mass flow rate due to lower average viscosity values of the fluid inside the porous medium. Completely opposite phenomena are applicable to high viscosity fluids. The results of this analysis can be applied to optimize the porous solar collectors used for air heating, the passive solar systems which are based on the Trombe-Michel phenomenon, the heat storage systems and other systems employing heat processes.
Bibliographic Reference: 2ND NATIONAL CONFERENCE ON ALTERNATIVE SOURCES OF ENERGY, THESSALONIKI (GREECE), NOV. 6-8, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER GR 32460 ORA
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Record Number: 1989124056000 / Last updated on: 1994-09-12
Available languages: el