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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11505
Title: Experimental Investigation of Heat Transfer Enhancement in Rectangular Duct with Pentagonal Ribs
Authors: Sharma N.
Tariq, Andallib
Mishra, Manish
Published in: Heat Transfer Engineering
Abstract: Rib turbulators are extensively used in augmentation of convective heat transfer in several applications related to heat exchange and cooling in thermal energy systems. Present experimental investigation examines the local heat transfer and friction factor characteristics of pentagonal ribs mounted on bottom heated wall of a rectangular channel. The emphasis is towards assessing and analysing the potential impact of varying chamfering angle (0 to 20°) and rib pitch to height ratio (6 to 12) on the overall heat transfer enhancement and its distribution on the surface. Experiments are performed at different Reynolds numbers ranging from 9400 to 58850. Liquid crystal thermography is applied to measure surface temperature distribution and finally to demonstrate the local heat transfer coefficient over the ribbed surface. The results depict that the local augmentation Nusselt number distribution is axisymmetric and shows 2-dimensionalty in heat transfer distribution. Pentagonal ribs show a significant improvement for the low heat transfer zones in leeward vicinity of the square rib, specially prominent at higher Reynolds number, and therefore seen as the potential benefit in terms of obviating the hotspots. It is observed that the pentagonal ribs lead to superior heat transfer enhancement in conjunction with significant reduction in pressure penalty as compared to square ribs and thus ensures an enhanced thermo-hydraulic performance. © 2018, © 2018 Taylor & Francis Group, LLC.
Citation: Heat Transfer Engineering (2019), 40(43832): 147-165
URI: https://doi.org/10.1080/01457632.2017.1421135
http://repository.iitr.ac.in/handle/123456789/11505
Issue Date: 2019
Publisher: Taylor and Francis Ltd.
ISSN: 1457632
Author Scopus IDs: 57194590686
57119258700
55126794600
Author Affiliations: Sharma, N., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Tariq, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Mishra, M., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Funding Details: The author acknowledges the financial support of the Ministry of Human Resource and Development (MHRD), India for initiating this research activity in Mechanical & Industrial Engineering Department at Indian Institute of Technology Roorkee, India. Further authors wish to extend sincere thanks and acknowledge the support of Department of Science and Technology (DST), India for providing the financial assistance in order to improve the laboratories at IIT Roorkee under the FIST grant.
Corresponding Author: Tariq, A.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeIndia; email: tariqfme@iitr.ac.in
Appears in Collections:Journal Publications [ME]

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