The turbulent boundary layer on a rough porous plate: Experimental heat transfer with uniform blowing
Abstract
Stanton number measurements were made for a transpired turbulent boundary layer on a rough surface. Tests were conducted at uniform blowing fractions from 0 to .008, with uniform surface temperatures and uniform freestream velocity. The xReynolds number range of these tests was from 10,000 to 1,000,000, and the roughness Reynolds number range from 20 to 200. Several mean velocity profiles were taken to measure boundary layer growth, and the boundary layer momentum thickness variation along the test surface was used to estimate rough plate skin friction. The data indicate the expected increase in both skin friction and heat transfer due to roughness. The blowing data indicate that a form of the Couette flow model used for smooth surface boundary layers can predict the effects of blowing on rough surface Stanton number. Predictions of the experimental boundary layers were made using a prediction method which employs the PatankarSpalding finitedifference formulation and mean field closure with a mixinglength model with van Driest type damping. The effects of roughness were incorporated into this prediction program by modification of the mixing length and turbulent Prandtl number models used for smooth surface turbulent boundary layers. A closedloop wind tunnel was constructed for these tests.
 Publication:

Ph.D. Thesis
 Pub Date:
 1974
 Bibcode:
 1974PhDT........51H
 Keywords:

 Heat Transfer;
 Porous Plates;
 Stanton Number;
 Surface Roughness;
 Turbulent Boundary Layer;
 Blowing;
 Couette Flow;
 Finite Difference Theory;
 Prandtl Number;
 Skin Friction;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer