Study of Flow and Thrust in Nozzle-Flapper Valves

[+] Author and Article Information
S. Hayashi

Shizuoka University, Hamamatsu, Japan

T. Matsui

Dept. of Mechanical Engineering, Shizuoka University, Hamamatsu, Japan

T. Ito

Dept. of Mechanical Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya, Japan

J. Fluids Eng 97(1), 39-50 (Mar 01, 1975) (12 pages) doi:10.1115/1.3447213 History: Received December 15, 1974; Online October 12, 2010


The Navier-Stokes equations and the equation of continuity describing the flow in the flat-faced nozzle-flapper valve are numerically solved by the iterative relaxation method and the effect of the flow contraction (vena contracta) occurring in the radial gap in the valve is investigated. Furthermore, an approximate formula for the flow force acting on the flapper is derived on the basis of the numerical solutions. The formula for the flow force is in good agreement with experimental results.

Copyright © 1975 by ASME
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