# Valve Boundary Conditions

 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 6, 2004, 10:01 Valve Boundary Conditions #1 Asok Guest   Posts: n/a I am modelling water flow through valves to find out the throttling characteristics.Basicaly I would like to know what will the mass flow rate for various valve openings.Assuming that the pipe incorporating the valve being connected to a centrifugal pump on one side and open to the atmosphere on the other end, what type of boundary conditions should I give for different valve positions. Thanking you.

 October 7, 2004, 15:51 Re: Valve Boundary Conditions #2 Noora Guest   Posts: n/a The BC would be for pressures at the upstream of the valve(pump discharge pressure) and the downstream (atmospheric pressure). This in turn gives the delta P across the valve. This and the valve discharge coefficient Cv, will determine the flow as a function of valve opening provided the fluid density is known. Want more, Don't hesitate.

 October 8, 2004, 05:16 Re: Valve Boundary Conditions #3 Asok Guest   Posts: n/a Thanks Noora.I am happy that I had also thought in the same lines.The point to be further decided is what should be the value of the upstream pressure.(1)Whether it is the pressure value obtained when the valve is fully shut or (2)the pressure corresponding to the velocity of water when the valve is fully open or (3) the pressure corresponding to the manometric head of the pump. Regards and thanks.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Anindya Main CFD Forum 25 February 27, 2016 13:58 mehrdadeng CFX 10 February 25, 2011 06:25 Shafiul CFX 10 February 17, 2011 08:57 Young CFX 5 October 6, 2008 23:17 Paolo Lampitella FLUENT 0 June 12, 2008 06:25

All times are GMT -4. The time now is 19:38.