Experimental Investigation of Turbulent Heat Transfer in Straight and Curved Rectangular Ducts.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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An experimental apparatus has been constructed and tested to examine the convective heat transfer in straight and curved ducts of rectangular cross-section. The channel can be configured with both walls independently heated at a constant heat flux, or one wall at a constant heat flux and the opposite wall adiabatic. Local and average Nusselt numbers can be calculated, and used to evaluate the effect of curvature on heat transfer. Experiments were conducted at steady state of turbulent flow with one wall heated at a constant flux and the opposite wall adiabatic. The heat transfer characteristics of the straight and curved sections, on both the inner and outer walls, were compared. The heat transfer rate of the concave curved wall proved to be enhanced over both the convex curved wall and both straight sections. Keywords Taylor-Gortler Vortices, Dean Number, Heat Transfer, Turbulent Flow, Rectangular Curved Channel, Rectangular Straight Channel, Secondary Flow, Concave, and Convex.
- Fluid Mechanics