Using delta wings placed at the leading edge of a flat plate, streamwise vortices are generated that modify the flow; the same wings are also used to modify a developing channel flow. Local and average measurements of convection coefficients are obtained using naphthalene sublimation, and the structure of the vortices is studied using flow visualization and vortex strength measurements. The pressure drop penalty associated with the heat transfer enhancement of the channel flow is also investigated. In regions where a vortex induces a surface-normal inflow, the local heat transfer coefficients are found to increase by as much as 300 percent over the baseline flow, depending on vortex strength and location relative to the boundary layer. Vortex strength increases with Reynolds number, wing aspect ratio, and wing attack angle, and the vortex strength decays as the vortex is carried downstream. Considering the complete channel surface, the largest spatially averaged heat average heat transfer enhancement is 55 percent; it is accompanied by a 100 percent increase in the pressure drop relative to the same channel flow with no delta-wing vortex generator.
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Heat Transfer Enhancement by Delta-Wing-Generated Tip Vortices in Flat-Plate and Developing Channel Flows
M. C. Gentry, Graduate Research Assistant,
M. C. Gentry, Graduate Research Assistant
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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A. M. Jacobi, Professor of Mechanical Engineering
A. M. Jacobi, Professor of Mechanical Engineering
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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M. C. Gentry, Graduate Research Assistant
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
A. M. Jacobi, Professor of Mechanical Engineering
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division August 24, 2001; revision received June 26, 2002. Associated Editor: Kenneth S. Ball.
J. Heat Transfer. Dec 2002, 124(6): 1158-1168 (11 pages)
Published Online: December 3, 2002
Article history
Received:
August 24, 2001
Revised:
June 26, 2002
Online:
December 3, 2002
Citation
Gentry, M. C., and Jacobi, A. M. (December 3, 2002). "Heat Transfer Enhancement by Delta-Wing-Generated Tip Vortices in Flat-Plate and Developing Channel Flows ." ASME. J. Heat Transfer. December 2002; 124(6): 1158–1168. https://doi.org/10.1115/1.1513578
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