Relaxation of the turbulent boundary layer after an abrupt change from rough to smooth wall

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Journal of Fluids Engineering; (United States)

DOI:https://doi.org/10.1115/1.2910149· OSTI ID:5617872

Taylor, R P; Taylor, J K ^[1]; Hosni, M H ^[2]; Coleman, H W ^[3]

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1. Mississippi State Univ., Mississippi State, MS (United States). Mechanical and Nuclear Engineering Dept.
2. Kansas State Univ., Manhattan, KS (United States). Dept. of Mechanical Engineering
3. Univ. of Alabama, Huntsville, AL (United States). Mechanical Engineering Dept.

Measurements of velocity and turbulence intensity profiles and skin friction coefficient are presented for turbulent flat-plate boundary layer flow over a test surface with a rough-to-smooth 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 uniform staggered array, and the remaining 1.5 m length is smooth. The profiles are compared with previous data for all-rough cases under closely matched conditions in the same facility. The skin friction data are compared with previous data for both all-rough and all-smooth cases.

• OSTI ID: 5617872
• Journal Information: Journal of Fluids Engineering; (United States), Journal Name: Journal of Fluids Engineering; (United States) Vol. 115:3; ISSN 0098-2202; ISSN JFEGA4
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY LAYERS
FLUID FLOW
FRICTION
FRICTION FACTOR
LAYERS
ROUGHNESS
SURFACE PROPERTIES
TURBULENT FLOW
VELOCITY