UNSPECIFIED. (2003) Laminar-turbulent boundary-layer transition over a rough rotating disk. PHYSICS OF FLUIDS, 15 (8). pp. 2441-2444. ISSN 1070-6631

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Abstract

Boundary-layer transition over a disk spinning under water is investigated. Transitional Reynolds numbers, Re-c, and associated boundary-layer velocity profiles are determined from flow-visualizations and hot-film measurements, respectively. The value of Re-c and the velocity profiles are studied as a function of the disk's surface roughness. It is found that transition over rough disks occurs in a similar fashion to that over smooth disks, i.e., abruptly and axisymmetrically at well-defined radii. Wall roughness has little effect on Re-c until a threshold relative roughness is reached. Above the threshold Re-c decreases sharply. The decrease is consistent with the drop one expects for our flow for the absolute instability discovered by Lingwood [J. Fluid Mech. 299, 17 (1995); 314, 373 (1996); 331, 405 (1997)]. This indicates that the Lingwood absolute instability may continue to play a major role in the transition process even for large relative roughness. (C) 2003 American Institute of Physics.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics
Journal or Publication Title:	PHYSICS OF FLUIDS
Publisher:	AMER INST PHYSICS
ISSN:	1070-6631
Date:	August 2003
Volume:	15
Number:	8
Number of Pages:	4
Page Range:	pp. 2441-2444
Identification Number:	10.1063/1.1586916
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9541

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