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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/10906
Title: Aerothermal characteristics of a rectangular duct with periodic trapezium ribs
Authors: Sharma N.
Tariq, Andallib
Mishra, Manish
Published in: Journal of Enhanced Heat Transfer
Abstract: An experimental investigation of aerothermal performance, and the underlying flow mechanism in a rectangular channel mounted with trapezium ribs, has been carried out at a Reynolds number of 42500. Transient Liquid Crystal Thermography (LCT) has been employed to get the local heat transfer coefficient (HTC) distributions on the rib turbulated wall. Primarily, the effects of trapezium angle (γ = 5, 10, 15, and 20°) and pitch ratio (p/e = 6, 8, 10, and 12) have been studied on local- and spanwise averaged heat transfer fields. In addition, the performance indexes in terms of overall heat transfer enhancement factor, friction factor and overall performance factor have been compared, and found that most of the trapezium ribs (except γ = 10°) provide a better overall performance when compared to square rib (γ = 0°). However, the heat transfer characteristics are further correlated and explained by flow field quantities; i.e., ensemble averaged streamlines and mean velocities, critical flow structures, coherent structures, and fluctuation statistics, obtained by Particle Image Velocimetry (PIV) at a pitch ratio of 12. The variation in spatial distribution of thermal enhancement factor confirms the streak of reattachment, separations and recirculation bubble, which are closely related to the definable time-averaged flow structures; i.e., recirculation bubble, corner eddies, reattachment zone and the boundary layer redevelopment region. The simultaneous study of detailed aerothermal features gives confirmation with regards to the role of fluid dynamic factors in the heat transfer augmentation. © 2019 by Begell House, Inc.
Citation: Journal of Enhanced Heat Transfer (2019), 26(4): 295-315
URI: https://doi.org/10.1615/JEnhHeatTransf.2018028268
http://repository.iitr.ac.in/handle/123456789/10906
Issue Date: 2019
Publisher: Begell House Inc.
Keywords: Critical flow structures
Flow characteristics
Heat transfer distribution
LCT
Overall performance factor
PIV
ISSN: 10655131
Author Scopus IDs: 57194590686
57119258700
55126794600
Author Affiliations: Sharma, N., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeUttarakhand 247667, India, 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 RoorkeeUttarakhand 247667, India
Tariq, A., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeUttarakhand 247667, India
Mishra, M., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeUttarakhand 247667, India
Corresponding Author: Sharma, N.; Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeIndia; email: sharma.naveen28@yahoo.com
Appears in Collections:Journal Publications [ME]

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