Analysis of Two-Phase Flow in Cryogenic Damper Seals—Part I: Theoretical Model

[+] Author and Article Information
Grigory L. Arauz, Luis San Andrés

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123

J. Tribol 120(2), 221-227 (Apr 01, 1998) (7 pages) doi:10.1115/1.2834413 History: Received December 03, 1996; Revised April 16, 1997; Online January 24, 2008


Cryogenic fluid damper seals operating close to the liquid-vapor region (near the critical point or slightly sub-cooled) are likely to develop a two-phase flow region which affects the seal performance and reliability. An all-liquid, liquid-vapor, and all-vapor, i.e., a “continuous vaporization” bulk flow model is presented for prediction of the seal dynamic forced response. Continuity, momentum, and energy (enthalpy) transport equations govern the two-phase flow of a homogeneous saturated mixture in thermodynamic equilibrium. Static and dynamic force performance characteristics for the seal are obtained from a perturbation analysis of the governing equations. Theoretical predictions and comparisons to experimental measurements in a liquid and gaseous nitrogen seal are presented in Part II. The effects of two-phase flow regimes on the dynamic force coefficients and stability of an oxygen damper seal are also discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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