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IJMERR 2022 Vol.11(6): 429-436

The Effect of Holes Number in Cylindrical Samples on the Forced Convection Heat Flow

Saif Ali Kadhim and Osama Abd Al-Munaf Ibrahim
Mechanical Engineering Department, University of Technology – Iraq, Baghdad, Iraq

Abstract—In this article, an experimental study was conducted on the effect of side holes in circular cylinders on the forced convection heat transfer process. Three circular cylindrical samples were made of aluminum. Sample No.1 without side holes, sample No.2 with two side holes, and sample No.3 with four side holes. These cylindrical samples were placed after being heated in an air duct (working section) and the position of samples in an air duct are same. Air laminar cross-flow was applied to the cylindrical samples at different velocities while observing their temperature drop. The results showed that the perforated cylinders increase the rate of heat dissipation compared to non-perforated cylinder at all air flow velocities and that the largest rate of heat dissipated was in the sample NO.3 by (24.8573 W) at temperature drop (10˚C) and air flow velocity (24.6688 m/s). Also Nusselt number was calculated at Reynolds number range (7435-20697), where it become discovered that Nusselt number will increase with the Reynolds number in all cylindrical samples. Empirical relationships for Nusselt number with Reynolds number and Prandtl number had been get it for the three circular cylinders and liken with relationships of circular cylindrical forms exist in other references. These Empirical relationships given acceptable constants values.

Index Terms—heat transfer, forced convection, circular cylinder, Reynolds number, Nusselt number

Cite: Saif Ali Kadhim and Osama Abd Al-Munaf Ibrahim, "The Effect of Holes Number in Cylindrical Samples on the Forced Convection Heat Flow," International Journal of Mechanical Engineering and Robotics Research, Vol. 11, No. 6, pp. 429-436, June 2022. DOI: 10.18178/ijmerr.11.6.429-436

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