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Titolo:
Experimental study on the turbulent boundary layer flow over riblets surface
Autore:
Wang, JJ; Lan, SL; Chen, G;
Indirizzi:
Beijing Univ Aeronaut & Astronaut, Inst Fluid Mech, Beijing 100083, Peoples R China Beijing Univ Aeronaut & Astronaut Beijing Peoples R China 100083 R China
Titolo Testata:
FLUID DYNAMICS RESEARCH
fascicolo: 4, volume: 27, anno: 2000,
pagine: 217 - 229
SICI:
0169-5983(200010)27:4<217:ESOTTB>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPEN-CHANNEL FLOW; DRAG REDUCTION; WALL REGION; SPEED;
Keywords:
turbulent boundary layer flow; riblets surface; LDV measurement; flow visualization; low-speed streak structures;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, JJ Beijing Univ Aeronaut & Astronaut, Inst Fluid Mech, Beijing 100083, Peoples R China Beijing Univ Aeronaut & Astronaut Beijing Peoples R China 100083
Citazione:
J.J. Wang et al., "Experimental study on the turbulent boundary layer flow over riblets surface", FLUID DYN R, 27(4), 2000, pp. 217-229

Abstract

The laser Doppler velocimeter (LDV) and hydrogen bubble flow visualizationtechniques have been used to measure the characteristics of turbulent boundary layer flow over riblets surface and to observe its coherent structure in the near wall region. The experimental results indicate that, in comparison with the turbulent boundary layer flow over a smooth surface, greater values are obtained for the thickness of viscous sublayer, the thickness of buffer region and the integral constant C in the log-law. Moreover, the maximum value of turbulent intensity u'/U*, is increased by 6.7%, but its position is decreased by 6.4%, the skewness factor and the flatness factor are hardly affected by the riblets surface. The non-dimensional value of low-speed streak spacing is reduced by 20%, this is also an indication of turbulent drag reduction. (C) 2000 The Japan Society of Fluid Mechanics and Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 14:28:53