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Laminar-turbulent boundary-layer transition over a rough rotating disk
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UNSPECIFIED (2003) Laminar-turbulent boundary-layer transition over a rough rotating disk. PHYSICS OF FLUIDS, 15 (8). pp. 2441-2444. doi:10.1063/1.1586916 ISSN 1070-6631.
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Official URL: http://dx.doi.org/10.1063/1.1586916
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 | ||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics |
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Journal or Publication Title: | PHYSICS OF FLUIDS | ||||
Publisher: | AMER INST PHYSICS | ||||
ISSN: | 1070-6631 | ||||
Official Date: | August 2003 | ||||
Dates: |
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Volume: | 15 | ||||
Number: | 8 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 2441-2444 | ||||
DOI: | 10.1063/1.1586916 | ||||
Publication Status: | Published |
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