Effect of Slot Jet Temperature on Impingement Heat Transfer over a Heated Circular Cylinder

[+] Author and Article Information
Sharad Pachpute

Research Scholar, Department of Mechanical Engineering, IIT Delhi, Hauz Khas, New Delhi -110016, India

B. Premachandran

Associate Professor, Department of Mechanical Engineering, IIT Delhi, Hauz Khas, New Delhi -110016, India

1Corresponding author.

ASME doi:10.1115/1.4041958 History: Received April 20, 2018; Revised October 31, 2018


In this paper, heat transfer and effectiveness of a turbulent slot jet impinging over a heated circular cylinder has been investigated numerically by varying the inlet jet temperature (Tj) from 223K to 350K. In all cases, the ambient temperature (Tamb) is assumed to be constant (300K). The Reynolds number defined based on the average nozzle exit velocity, the diameter of the cylindrical target (D) and properties at the nozzle exit temperature, ?Re?_D=?VD/µ is varied from 6000 to 20000. The ratio of cylinder diameter to the slot width, D/S =5.5, 8.5 and 17 are considered and the non-dimensional distance from the nozzle exit to the cylinder, H/S is varied in the range of 2 = H/S =12. The turbulence model was used for numerical simulations. Numerical results reveal that the local Nusselt number is found to be higher at the stagnation point in the case of cold jet impingement at Tj = 223K. The local heat transfer at the rear side of the cylinder is 8 to 18% less as compared to that of Tj =Tamb for ReD = 6000. The local effectiveness calculated over a circular cylinder strongly depends on H/S and D/S. Based on the parametric study, a correlation has been provided for the local effectiveness at the stagnation point.

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