FREE/ MIXED CONVECTION IN VERTICAL POROUS CHANNEL

Convective heat transfer or simply convection is the study of transport processes
Effected by the flow of fluids. Convective heattransfer has grown to the status of a
contemporary science because ofpeople desire to understand andpredict how a fluid
flow will act as a carrier or conveyer belt for energy and matter. How ever
Convective heat transfer is clearly, afield at interface betweentwo older fields: heat
transfer and fluid mechanics. For this reason, the study of any convective heat
transfer problem must reset ona solid understanding of basic heat transfer and fluid
mechanics principles.
Since this research will cover free convection and porous medium we discuss briefly
about it. Fluid flow and convection heat transfer in porous media have been widely
investigated experimentally and numerically for many years due to the many
important applications, such as catalytic and chemical particle beds, petroleum
processing, geothermal energy extraction, transpiration cooling, packed-bed
regenerators, solid matrix heat exchangers, micro-thrusters and many others. Porous
media can intensify fluid mixing and increase the surface area in contact with the
coolant, so porous structures are an effective heat transfer augmentation technique.
There have been numerous investigations with theoretical analyses and numerical
simulations of convection heat. However in this project the simulation have been
done and the results have been obtained and the maximum velocity of the hot air is
about 0.0003m/s moreover the velocity in figure 11showed the maximum near the
heated wall and in natural convection the maximum velocity is on the heated wall,
therefore the velocity is very identical to the assumption of Darcy flow is valid when
the fluid is not too fast ref [7] For the temperature is about 1270K and the
temperature we can manipulate it by supply heat flux at high or low see the
appendices 1&2 check temperature contour for different values for heat flux
therefore we can conclude that the velocity obtained by simulation is satisfied as
well as the temperature.