Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/10907
Title: Aerothermal Characteristics of Solid and Slitted Pentagonal Rib Turbulators
Authors: Tariq, Andallib
Sharma N.
Mishra, Manish
Published in: Journal of Heat Transfer
Abstract: This work is an experimental study of detailed aerothermal characteristics inside a duct carrying an array of solid and permeable pentagonal ribs with a parallel and inclined slit, mounted on the bottom wall. The rib height-to-hydraulic diameter ratio, the rib pitch-to-height ratio, and the open area ratio fixed during experiments are 0.125%, 12%, and 25%, respectively. The heat transfer coefficient (HTC) distribution is mapped by using transient liquid crystal thermography (LCT), while the detailed flow measurements are performed by using particle image velocimetry (PIV). The primary focus of the study is to assess the influence of inter-rib region flow characteristics on the local heat transfer fields. The heat transfer and friction factor measurements are evaluated along with thermohydraulic performances at different Reynolds numbers, i.e., 26,160, 42,500, and 58,850. Performance indexes show that the pentagonal ribs with the inclined-slit are superior to other configurations from both perspective. Aerothermal features within inter-rib region were elucidated by analyzing the time-averaged streamlines, mean velocities, fluctuation statistics, vorticity, turbulent kinetic energy (TKE) budget terms, and local and spanwise-averaged Nusselt number as well as augmentation Nusselt numbers. Critical flow structures and coherent structures were identified, which illustrate about different flow dynamic processes. The flow emanating out of the inclined-slit pentagonal rib significantly affects the magnitude of streamwise velocity, fluctuation statistics, vorticity, and TKE budget terms at the downstream corner, whereas the dissipation term of TKE budget correlates well with the surface heat transfer distribution. Copyright © 2018 by ASME.
Citation: Journal of Heat Transfer (2018), 140(6): -
URI: https://doi.org/10.1115/1.4039398
http://repository.iitr.ac.in/handle/123456789/10907
Issue Date: 2018
Publisher: American Society of Mechanical Engineers (ASME)
ISSN: 221481
Author Scopus IDs: 57119258700
57194590686
55126794600
Author Affiliations: Tariq, A., Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Sharma, N., Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Mishra, M., Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Corresponding Author: Tariq, A.; Mechanical and Industrial Engineering Department, Indian Institute of Technology RoorkeeIndia; email: tariqfme@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.