Inertia Effects on the Dynamics of a Disk Levitated by Incompressible Laminar Fluid Flow

[+] Author and Article Information
D. K. Warinner

Argonne National Laboratory, Argonne, Ill. 60439

J. T. Pearson

School of Mechanical Engineering, Purdue University, West Lafayette, Ind.

J. Eng. Power 105(3), 643-653 (Jul 01, 1983) (11 pages) doi:10.1115/1.3227465 History: Received December 27, 1982; Online September 28, 2009


This paper develops a nonlinear ordinary differential equation (O.D.E.) of motion for a disk parallel to a flat plate and levitated by incompressible laminar flow of fluid supplied from a central orifice. The fluid’s inertia, reflected in high mass flow rates, is accounted for. The transient flow velocity and pressure field are found by iterative integration of the Navier-Stokes equation to determine the O.D.E. for the time-dependent height of the disk (or fluid film thickness). The film thickness is found by not only numerically integrating the O.D.E., but also by linearizing the equation to obtain a closed-form solution. The results of this combined squeeze-film, source-flow case compare favorably with experimental data presented which span cases from negligible inertia (viscous dominance) to cases of inertia dominance. Fortunately, the closed-form solution differs only slightly from the numerical solution; this provides relatively accurate expressions for the frequencies and damping coefficients in terms of the geometry, load (or weight of disk), mass flow rate, and the fluid properties.

Copyright © 1983 by ASME
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