The Effect of Tripping Wire Rings on the Average Heat Transfer from a Cross Circular Cylinder.

Document Type : Research Studies

Authors

1 Assistant Professor., Mechanical Power Engineering., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

2 Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Egypt.

Abstract

 Forced convection heat transfer experiments were provided to study the effects of tripping wire rings on the average heat transfer from a cross circular cylinder. The experimental data have been obtained When the test tube is covered by a number of tripping wire rings as well as the results obtained when the test tube is bare. The number of the tripping wire rings ranges between 0 and 53. The results have been presented in terms of Nusselt number and Reynolds number as well as the pitch to-diameter ratio of the tripping wire rings. Wind tunnel experiments extended over the range of the frec stream Reynolds numbers from 7.19x103 to 5.97x104. The pitch-to-diameter ratio varies between 0.172 and 1.131. The experiments are carried out for a constant rate of heat flux. The values of the average Nusselt number are fitted in a correlation. The correlation indicates that the Nusselt number is a significant function of Reynolds number and pitch to-diameter ratio. The augmentation of heat transfer varies from 13% to 62% as the pitch to diameter ratio varies from 1.131 to 0.172. 

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