Measurements of Stanton numbers, velocity profiles, temperature profiles, and turbulence intensity profiles are reported for turbulent flat plate boundary layer flows with a step change in surface roughness. The first 0.9 m length of the test surface is roughened with 1.27 mm diameter hemispheres spaced 2 base diameters apart in a staggered array. The remaining 1.5 m length is smooth. The experiments show that the step change from a rough to a smooth surface has a dramatic effect on the convective heat transfer. In many cases, the Stanton number drops below the smooth-wall correlation immediately downstream of the change in roughness. The Stanton number measurements are compared with predictions using the discrete element method with excellent results.
- International Gas Turbine Institute
Heat Transfer in the Turbulent Boundary Layer With a Step Change in Surface Roughness
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Taylor, RP, Taylor, JK, Hosni, MH, & Coleman, HW. "Heat Transfer in the Turbulent Boundary Layer With a Step Change in Surface Roughness." Proceedings of the ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration. Orlando, Florida, USA. June 3–6, 1991. V004T09A016. ASME. https://doi.org/10.1115/91-GT-266
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