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research-article

Effect of dimple intrusions and curvature radius of rounded corner triangular duct on Fluid flow and heat transfer

[+] Author and Article Information
Rajneesh Kumar

National Institute of Technology, Mechanical Engineering Department, Hamirpur, India
rajneesh127.nith@gmail.com

Sourabh Khurana

Om Institute of Technology and Management, Mechanical Engineering Department, Hisar, India
sourabhkhurana2@gmail.com

Anoop Kumar

National Institute of Technology, Mechanical Engineering Department, Hamirpur, India
anoop@nith.ac.in

Varun Goel

ASME Member, National Institute of Technology, Mechanical Engineering Department, Hamirpur, India
varun7go@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4041683 History: Received March 04, 2018; Revised September 26, 2018

Abstract

The sharp corner significantly affects the flow through triangular duct. In the corners, flow gets stagnant and results in poor heat transfer. Therefore, in the present study, one corner of the duct is kept rounded with variable curvature radius values (Rc). The curvature radius is selected in such a way that, it varied from the minimum value (i.e. Rc=0.333?duct height; h) to a maximum value (i.e. Rc=0.67h). In addition to this, the combined effect of both rounded corner and dimple-shaped intrusion has also been studied on flow of air and heat transfer. ANSYS (Fluent) 12.1 software is used to perform numerical simulations and good match is observed between the simulated and experimental results. Due to rounded corner and dimple intrusions, velocity near the corner region has higher value in comparison to the conventional duct. The uniform temperature distribution is seen in the case of dimple intruded duct as compared to conventional and rounded corner duct. In comparison to conventional duct with Rc of 0.67h, the heat transfer increased 21-25%, 13-20%, and 5-8%, for the Rc value of 0.33h, 0.49h, and 0.57h, respectively, but, the combination of rounded corner and dimple-shaped intrusions gives more heat transfer by 46-94%, 75-127%, 60-110%, for the z/e value of 6, 10, and 14, respectively, with the Reynolds number increase from 5600 to 17700.

Copyright (c) 2018 by ASME
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