Laminar-turbulent boundary-layer transition over a rough rotating disk
UNSPECIFIED. (2003) Laminar-turbulent boundary-layer transition over a rough rotating disk. PHYSICS OF FLUIDS, 15 (8). pp. 2441-2444. ISSN 1070-6631Full text not available from this repository.
Official URL: http://dx.doi.org/10.1063/1.1586916
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|
|Official Date:||August 2003|
|Number of Pages:||4|
|Page Range:||pp. 2441-2444|
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