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RESEARCH PAPERS

Experimental Analysis and Flow Visualization of a Thin Liquid Film on a Stationary and Rotating Disk

[+] Author and Article Information
S. Thomas, A. Faghri, W. Hankey

Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435

J. Fluids Eng 113(1), 73-80 (Mar 01, 1991) (8 pages) doi:10.1115/1.2926500 History: Received January 11, 1990; Online May 23, 2008

Abstract

The mean thickness of a thin liquid film of deionized water with a free surface on a stationary and rotating horizontal disk has been measured with a nonobtrusive capacitance technique. The measurements were taken when the rotational speed ranged from 0–300 rpm and the flow rate varied from 7.0–15.0 lpm. A flow visualization study of the thin film was also performed to determine the characteristics of the waves on the free surface. When the disk was stationary, a circular hydraulic jump was present on the disk. Upstream from the jump, the film thickness was determined by the inertial and frictional forces on the fluid, and the radial spreading of the film. The surface tension at the edge of the disk affected the film thickness downstream from the jump. For the rotating disk, the film thickness was dependent upon the inertial and frictional forces near the center of the disk and the centrifugal forces near the edge of the disk.

Copyright © 1991 by The American Society of Mechanical Engineers
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