G EXPERIMENTAL AND THEORETICAL STUDY OF FORCED CONVECTION AROUND A CYLINDER EMBEDDED IN POROUS MEDIA

الملخص

An experimental and theoretical study of air forced convection heat transfer at Reynolds
number (1091.5 to 1560) around a circular cylinder placed in an iron test section (0.2x0.2x0.4
m3) filled with saturated porous material glass balls of 5mm in diameter. A copper circular
cylinder heater of diameter 0.015m and length 0.2m is heated electrically; it is located in
different positions in X and Y direction within the test section. The forced convection heat
transfer is simulated using the ANSYS program (Fluent). The results showed that the surface
temperature distribution of the cylinder has the same trends for the different locations within
the test section. The average Nusselt number increases with Reynolds number and heat flux.
Also, the results show that the use of porous material improves heat transfer by 67.4%. The
maximum percentage deviation between the experimental and theoretical results is 1.622%.
Moreover, experimental correlations were introduced and comparison was performed
between the present results with the previous studies and it gives a good agreement.