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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/23552
Title: Enhanced heat transfer and flow features in a duct mounted with various ribs
Authors: Sharma N.
Tariq, Andallib
Mishra, Manish
Published in: Journal of Enhanced Heat Transfer
Abstract: The present experimental work is a comprehensive study of heat transfer and flow field characteristics inside a rectangular duct integrated with ribs of variable cross sections on the bottom wall. Four kinds of rib configurations, i.e., square (Case 1), pentagonal (Case 2), trapezium (Case 3), and truncated prismatic (Case 4), were deployed in the cooling passage to improve the thermal performance. The optical techniques, i.e., particle image velocimetry for flow field measurements and liquid crystal thermography for surface temperature measurements, were used to obtain reliable and accurate information about the flow and heat transfer features without disturbing the actual flow conditions. Transient experiments were conducted at a typical Reynolds number value, i.e., 42,500. The influence of the rib configurations and their relative spacing (P/e = 8, 10, and 12) were studied through the mapping of local- A nd spanwise-averaged enhanced heat transfer. Furthermore, the thermal performance parameters (overall Nusselt number augmentation, friction factor ratio, and thermohydraulic performance) are discussed in detail to select the best rib design. The truncated prismatic rib provided the best values of the thermal (27.91%), friction (32.75%), and thermohydraulic performance (45.16%) at P/e = 8, P/e = 12, and P/e = 8, respectively, when compared with square ribs. Moreover, the reasons for the variations in the heat transfer distribution inside the ribbed passages are elucidated through the flow structure information (mean velocities, mean streamlines, fluctuation statistics, mean vorticity, and turbulent intensity) at a relative spacing of 12. The heat transfer results are in harmony with the flow features, which helps in understanding the fundamental heat transfer mechanism. © 2020 by Begell House, Inc.
Citation: Journal of Enhanced Heat Transfer, 27(6): 505-526
URI: https://doi.org/10.1615/JENHHEATTRANSF.2020034463
http://repository.iitr.ac.in/handle/123456789/23552
Issue Date: 2020
Publisher: Begell House Inc.
Keywords: Enhanced heat transfer
Flow structures
Liquid crystal thermography (LCT)
Particle image velocimetry (PIV)
Pressure drop
Thermohydraulic performance factor
ISSN: 10655131
Author Scopus IDs: 57194590686
57119258700
55126794600
Author Affiliations: Sharma, N., Department of Mechanical Engineering, DVR and Dr. HS MIC College of Technology, Kanchikacherla, A.P., 521180, India, Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, 247667, India
Tariq, A., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, 247667, India
Mishra, M., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, 247667, India
Corresponding Author: Sharma, N.; Department of Mechanical Engineering, India; email: sharma.naveen28@yahoo.com Sharma, N.; Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, India; email: sharma.naveen28@yahoo.com
Appears in Collections:Journal Publications [ME]

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