Fluid Forces on Rods Vibrating in Finite Length Annular Regions

[+] Author and Article Information
T. M. Mulcahy

Components Technology Division, Argonne National Laboratory, Argonne, Ill. 60439

J. Appl. Mech 47(2), 234-240 (Jun 01, 1980) (7 pages) doi:10.1115/1.3153648 History: Received February 01, 1979; Revised November 01, 1979; Online July 21, 2009


Approximate expressions for the fluid forces acting on a central, rigid rod translating periodically in a finite length annular region of confined fluid are derived from the Navier-Stokes equations for a range of geometric and fluid parameters where viscous damping is significant. Based on the derived forces, lumped added mass, and linear dashpot modeling of an annular gap support typically found in nuclear reactors is employed to predict the fundamental frequency and modal damping of a single beam. Test methods and results for the same beam are presented which indicate the force expressions are applicable for small fluid motions.

Copyright © 1980 by ASME
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