Experimental Study of Heat Transfer Characteristics of a Bluff Body Interacting With a Rib by Using Liquid Crystal Thermography

Zahra Ghorbani-Tari, Lei Wang, Bengt Sundén

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

1 Citation (SciVal)

Abstract

In the present study, the effects of a single rib on the local heat transfer around a bluff body are examined by using the steady state liquid crystal technique. By varying the spacing between the bluff body and the rib, the interaction between the rib and the bluff body can be controlled. The bluff body is oriented vertically towards the flow direction and spans the whole height of the channel. The bluff body has a rectangular cross-section (height b = 80 mm, width 40 mm) while the rib has a square cross-section (rib height e= 10 mm, rib width 10 mm). The rib is placed in the upstream region of the bluff body either by a spacing L = 100 and 50 mm to yield nondimensional spacing to rib height ratios L/e = 10 and 5 respectively. Here, the re-attachment length (x(R)) for a single rib is about 7.5e. The values of the Reynolds number based on the channel hydraulic diameter (D-h) are 55,000 and 89,000. The experimental results revealed that the presence of the rib at L/e = 10 has a more pronounced effect on the enhancement of the heat transfer upstream region of the bluff body. The effect of different L/e on the local Nu number distribution in the wake of the bluff body is small.
Original languageEnglish
Title of host publicationProceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8B: Heat Transfer and Thermal Engineering
PublisherAmerican Society Of Mechanical Engineers (ASME)
PagesV08BT09A060
Volume8B
ISBN (Print)978-0-7918-5635-2
DOIs
Publication statusPublished - 2014
EventASME International Mechanical Engineering Congress and Exposition, 2013 - San Diego, CA, United States
Duration: 2013 Nov 152013 Nov 21

Publication series

Name
Volume8B

Conference

ConferenceASME International Mechanical Engineering Congress and Exposition, 2013
Abbreviated titleIMECE2013
Country/TerritoryUnited States
CitySan Diego, CA
Period2013/11/152013/11/21

Subject classification (UKÄ)

  • Energy Engineering

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