Experimental study of heat transfer to air flowing through an inclined porous duct

Abstract Inclined duct has many engineering applications like air conditioning system, solar collector and cooling system of photovoltaic module. Forced convection of air flowing through an inclined square porous duct is described in this paper. The experiments by varying Reynolds number, heat flux and inclination angle have been conducted under Reynolds number at 8355, 13485 and 18600 range, heat flux 480, 990 and 1520 W m −2 and inclination duct angle 30°–60°. The porous pad used was zig-zag metallic wire mesh with porosity equals 0.99. The results show that Nusselt number is increased with increasing heat flux and Reynolds number at all orientations. At the same Reynolds number and heat flux, Nusselt number is enhanced about 4.7% with increasing inclination angle from 30° to 60°. Nusselt number is to be 24%, 21% higher than horizontals porous duct at inclination angle 60°–30°, respectively. Many empirical relations have been obtained.