Abstract
A numerical heat-transfer and pressure-drop analysis is presented for porous rings inserted in a pipe at a distance L apart. A constant heat-flux is applied to the outer surface of the pipe. Numerical calculations are conducted with the Fluent 6.1.22 code, using the shear-stress transport (SST) k– ω model. Air is the fluid. The heat-transfer increase is analyzed for Reynolds numbers from 3 × 10 3 to 45 × 10 3. The porous-ring height is taken as H = 1 or 2 mm. The distance between two porous rings is 0.5 D, D or 2 D where D is the inside diameter of the pipe. An increase in L/ D caused a decrease in heat-transfer. High Nusselt numbers were obtained when H/ D and L/ D ratios were 0.4 and 0.5, respectively, for a Reynold number of 45,000. The maximum Nusselt number occurred when L/ D = 1 if H/ D is selected as 0.2.
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