Abstract
An experimental study is performed to determine heat transfer performance in radially outward air flows through the gap s between two parallel circular disks having the inner and outer radii, r1 and r2 respectively. The through – flow Reynolds number ReDII and the geometrical parameters of the flow passage are varied. Experimental results are compared with those of convective heat transfer in parallel flow passages. An empirical expression is derived which predicts the mean Nusselt number, Num, incorporating the above governing parameters: Num=[1.20(L/DII)0.56+0.104(L/DII)−0.18ReDII0.74](s/r1)0.08Num=[1.20(L/DII)0.56+0.104(L/DII)−0.18ReDII0.74](s/r1)0.08 Here, ReDII denotes the Reynolds number, L = r2–r1, radial flow length; and DII, hydraulic diameter of the flow passage based on which both ReDH and Num are defined. It is disclosed that the heat transfer performance for radial flow between two parallel circular disks is superior to that for flow between two parallel plates. By virtue of its superior heat transfer performance, the radial flow passage can be included as one of the fundamental flow passages employed in heat exchangers.
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