期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 30, 期 2, 页码 141-152出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2005.03.022
关键词
boundary layer; turbulent; skin-friction coefficient; LDA; square grooves
Skin-friction coefficient of turbulent boundary layer flow over a smooth-wall with transverse square grooves was investigated. Four grooved-wall cases were investigated. The four grooved-wall configurations are single 5 mm square grooved-wall, and 5 mm square grooves spaced 10, 20 and 40 element widths apart in the streamwise direction. Laser-Doppler Anemometer (LDA) was used for the mean velocity and turbulence intensity measurements. The skin-friction coefficient determined from the velocity profile increases sharply just downstream of the groove. This overshoot is followed by an undershoot and then relaxation back to the smooth-wall value. This behavior is observed in most grooved-wall cases. Integrating the skin-friction coefficient in the streamwise direction indicates that there is an increase in the overall drag in all the grooved-wall cases. (c) 2005 Elsevier Inc. All rights reserved.
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