An experimental study was conducted to investigate the impact of wall heating on the flow structure in the near-wall region inside a square channel. PIV was used to measure the two-dimensional velocity fields. The measurements were conducted for a range of mass flow rates that cover laminar and turbulent regimes. The results have shown that when a flow is unstably stratified via heating through a bottom wall, both the mean and turbulent characteristics are affected. The results have shown that the impact of wall heating on the flow behavior is significantly different for laminar and turbulent flow regimes. It was found that when a flow that is originally laminar is heated, the mean streamwise velocity in the near-wall region is significantly increased and turbulence is generated in the flow predominantly due to buoyancy. When the flow is in the turbulent regime, addition of heat reduces the magnitudes of mean streamwise velocity and turbulent properties. The reduction in the magnitudes of turbulent properties in this flow regime is due to the working of turbulence against the buoyancy forces.
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ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference
July 8–12, 2007
Vancouver, British Columbia, Canada
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-4274-6
PROCEEDINGS PAPER
Influence of Wall Heating on Turbulent Structure
Shivani T. Gajusingh,
Shivani T. Gajusingh
Concordia University, Montreal, QC, Canada
Search for other works by this author on:
Kamran Siddiqui
Kamran Siddiqui
Concordia University, Montreal, QC, Canada
Search for other works by this author on:
Shivani T. Gajusingh
Concordia University, Montreal, QC, Canada
Kamran Siddiqui
Concordia University, Montreal, QC, Canada
Paper No:
HT2007-32438, pp. 1049-1054; 6 pages
Published Online:
August 24, 2009
Citation
Gajusingh, ST, & Siddiqui, K. "Influence of Wall Heating on Turbulent Structure." Proceedings of the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1. Vancouver, British Columbia, Canada. July 8–12, 2007. pp. 1049-1054. ASME. https://doi.org/10.1115/HT2007-32438
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