Experimental investigation of heat transfer between two parallel disks

Abstract

In the present study, a hundred experiments were performed and analyzed to investigate the effect of heat flux, space between two disks, and flow rate, on heat transfer between two parallel disks. An experimental setup and a spiral coil heater were specially designed to analyze the mentioned parameter’s effect on the heat transfer between the two parallel disks. This study analyzed the Nusselt number and discloses its behavior with respect to the change in mentioned parameters. This study shows that the Nusselt number increases with the increase of the flow rate and the space between two disks at a certain level. When heat flux increases, the local Nusselt number’s hyperbolic curve goes towards a straight line. This study shows that just after the entrance, there is a point that differentiates the disk into two zones in the first zone local Nusselt number decrease with the increase of heat flux, and in the second zone local Nusselt number increase with the increase of heat flux. After analysis of all cases, according to this study the optimum conditions for heat transfer, g = 17.36, s = 25mm, q = q3 = 605.78W/m² and Re = Re5 = 100.

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