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-   -   cfd model of a leaking valve?? (http://www.cfd-online.com/Forums/main/800-cfd-model-leaking-valve.html)

stephen rosen May 7, 1999 13:47

cfd model of a leaking valve??
 
Is it possible for cfd to model a leaking valve that contains such a small gap between valve disc and valve body? Can I restrict the cfd inlet velocity to simulate the small leakage rate of 20 cc/hr to 120 cc/hr?

John C. Chien May 7, 1999 14:56

Re: cfd model of a leaking valve??
 
(1). There is no limit on the size of the gap, there is no limit on the Reynolds number. (2). There is even a new field called "micro-fluid dynamics"- fluid dynamics in micro devices.(see ASME Journal of Fluid Engineering, recent issue? Also Journal of Tribology.)

Anil Shenoy May 10, 1999 11:44

Re: cfd model of a leaking valve??
 
Stephen,

I am sure CFD can do it. But if I were you I wouldn't bother to do CFD for such small flows use a annular leak equation and calculate the pressure drop (if thats what you want to find).

Q = pi*(bore dia) *(radial clearance).^3 *(delta p)/ (12*mu*length)

Anil


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