Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/23769
Title: Effect of permeable ribs on thermal-flow characteristics in an internal cooling duct
Authors: Sharma N.
Tariq, Andallib
Mishra, Manish
Published in: Journal of Thermal Science and Engineering Applications
Abstract: This study aims to understand the effect of flow structures within the inter-rib regions of a novel permeable rib configuration in vertical and horizontal streamwise planes upon surface heat transfer parameters. In this investigation, the liquid crystal thermography (LCT) and particle image velocimetry (PIV) are used to extract the local heat transfer and flow-field information, respectively. The effect of slit-converging angle (ϕ = 0 deg, 5 deg, 10 deg, and 15 deg) are examined at a typical Reynolds number of 42,500 and relative rib pitch ratio of 10. Surface- and spanwise-average and overall augmentation Nusselt numbers are obtained along with the pressure drop measurements. Flow-field experiments are performed in both vertical and horizontal streamwise planes, and the results are expressed in terms of mean velocities, stream traces, turbulent statistics, coherent structures, and turbulent kinetic energy budgets. Critical points are also identified on the basis of critical point theory, which provides evidences of the different flow phenomena accountable for enhance mixing between the ribs. The secondary flow coming from the slit shows three-dimensionality in the flow resulting to higher turbulence intensity and rotational motion (say higher turbulent mixing), and thereby leading to high heat transfer just behind the permeable rib. The permeable ribs are also helpful in the reduction of friction factor by 32% with a typical ϕ value of 5 deg, compared to solid ribs, while the thermohydraulic performance increases with increasing ϕ from 0 deg to 15 deg up to 21%. The pentagonal ribs with convergent slit provide comparable or better performance among the permeable rib geometries used in the pertinent literature. Copyright © 2020 by ASME
Citation: Journal of Thermal Science and Engineering Applications, 13(1)
URI: https://doi.org/10.1115/1.4047567
http://repository.iitr.ac.in/handle/123456789/23769
Issue Date: 2021
Publisher: American Society of Mechanical Engineers (ASME)
Keywords: Aerospace heat transfer
Experimental/measurement techniques
Forced convection
Gas turbine heat transfer
ISSN: 19485085
Author Scopus IDs: 57194590686
57119258700
55126794600
Author Affiliations: Sharma, N., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Lab, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Tariq, A., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Lab, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Mishra, M., Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Lab, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarkhand 247667, India
Funding Details: The authors acknowledge the financial support of the Ministry of Human Resource and Development (MHRD), India, for initiating this research activity in Mechanical and Industrial Engineering Department at Indian Institute of Technology Roorkee, India. Ministry of Human Resource Development, MHRD
Corresponding Author: Tariq, A.; Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Lab, India; email: atariq@me.iitr.ac.in
Appears in Collections:Journal Publications [ME]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.