The Turbulent Boundary Layer on a Rough, Porous Plate: Experimental Heat Transfer with Uniform Blowing

Stanton number measurements have been 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 temperature and uniform free- stream velocity. The x-reynolds number range of these tests was from 100,000 to 10 to the 7th power and the roughness Reynolds number range from 20 to 200. The data are believed to be accurate to within + or - .0001 Stanton number units over most of this range. At each test condition, several velocity profiles were taken to measure the boundary layer growth. The boundary layer momentum thickness variation along the test surface has been used to estimate rough-plate skin friction. The data indicate the expected increase in both skin friction and heat transfer due to roughness. The data display some unusual features when plotted against boundary layer size.