Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-19T11:44:43.299Z Has data issue: false hasContentIssue false

Flow between rotating finite disks with a closed end condition studied by heterodyne photon-correlation

Published online by Cambridge University Press:  17 February 2005

R. DI LEONARDO
Affiliation:
Department of Physics, University of Rome La Sapienza, P.le Aldo Moro 2, 00185, Italy
F. IANNI
Affiliation:
Department of Physics, University of Rome La Sapienza, P.le Aldo Moro 2, 00185, Italy
G. RUOCCO
Affiliation:
Department of Physics, University of Rome La Sapienza, P.le Aldo Moro 2, 00185, Italy

Abstract

We have investigated experimentally the swirling flow between a stationary and a rotating disk with fixed closed end. In order to perform velocimetry measurements we implemented a heterodyne photon-correlation setup and obtained the three components of the velocity field at different positions along the gap between the disks. We compared the results for two different Reynolds numbers with a numerical solution of the similarity equation, to investigate the relation between the finite and infinite disk solution, theoretically studied by Brady & Durlofsky (1987). For the measurements performed at $\hbox{\it Re}$ below the critical Reynolds number $\hbox{\it Re}_C\,{=}\,80$, we found that the two solutions agree very well near the axis of rotation. Above $\hbox{\it Re}_C$ we found that this quantitative agreement no longer holds, but the flow qualitatively resembles the Batchelor solution, with two boundary layers and a core rotating as a solid body. Our results validate the theoretical prediction for closed-end finite disk flow.

Type
Papers
Copyright
© 2005 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)