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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/17785
Title: Experimental study of detailed heat transfer and fluid flow characteristics in a rectangular duct with solid and slitted pentagonal RIBS
Authors: Sharma N.
Tariq A.
Mishra M.
Published in: Proceedings of ASME 2017 Gas Turbine India Conference, GTINDIA 2017
Abstract: Rib turbulator is the most effective, economically feasible, and rigorously studied tool to increase thermal performance because of its fundamental nature and due to the vast field of industrial applications. The rib turbulator results in heat transfer enhancement with additional pressure penalties, and thus encourages the researcher and designers towards selecting an efficacious rib configuration. The present work is a study towards detailed heat transfer and flow field characteristics inside a rectangular duct roughened by solid as well as ventilated pentagonal ribs placed transversely on the bottom wall. The rib height-to-hydraulic diameter ratio, the rib pitch-toheight ratio, the open area ratio, and the Reynolds number based on duct hydraulic diameter fixed during experiments are 0.125, 12, 25%, and 42500, respectively. The heat transfer coefficient (HTC) distribution was mapped by using transient Liquid Crystal Thermography (LCT) technique, while detailed flow measurements were made by using Particle Image Velocimetry (PIV) technique. The investigation focuses towards assessing the influence of three different rib configurations named as solid pentagonal ribs, pentagonal rib with parallel slit, and pentagonal rib with inclined slit, on the local heat transfer fields as well as flow characteristics. The flow mechanisms responsible for high or low heat transfer regions as well as for hot-spot formation in the wake of the ribs are identified and explained. The overall heat transfer and friction factor measurements are observed along with the thermohydraulic performance. Results show that the solid pentagonal ribs are superior to slitted ribs from both heat transfer augmentation and thermo-hydraulic performance perspective. Additionally, the slitted pentagonal ribs significantly control the small-scale vortices present at the leeward corner of the solid pentagonal ribs and eventually facilitates in preventing the hot spots formation with reduced pressure penalty. Copyright © 2017 ASME.
Citation: Proceedings of ASME 2017 Gas Turbine India Conference, GTINDIA 2017, (2017)
URI: https://doi.org/10.1115/GTINDIA2017-4651
http://repository.iitr.ac.in/handle/123456789/17785
Issue Date: 2017
Publisher: American Society of Mechanical Engineers
Keywords: Ducts
Flow of fluids
Fluid dynamics
Gas turbines
Heat transfer coefficients
Hydraulic motors
Liquid crystals
Reynolds number
Turbomachinery
Turbulent flow
Velocity measurement
Heat transfer and fluid flow
Heat transfer and friction factors
Heat transfer augmentation
Heat transfer coefficient (HTC)
Height-to-hydraulic diameter ratio
Particle image velocimetry technique
Thermo-hydraulic performance
Transient liquid crystals
Heat transfer
ISBN: 9.78E+12
Author Scopus IDs: 57194590686
57119258700
55126794600
Author Affiliations: Sharma, N., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Tariq, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Mishra, M., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
Appears in Collections:Conference Publications [ME]

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