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Old   January 25, 2007, 00:27
Default orifice problem
  #1
renuka
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hi

i amnew to fluent. In my problem fluid is flowing through pipe but their is a orifice in the pipe closing 25 percent of cs area. how to define it in fluent ans where to define ?

waiting for ur reply

thanks

RENUKA
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Old   January 25, 2007, 03:54
Default Re: orifice problem
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rams
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u make changes in the geometry (pipe) to reduce the cross section by 25%.

i mean add hollow cicular plate with the hollow area equal to the orffice hole area at the point where the orffice is located.
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Old   January 25, 2007, 04:07
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kamini
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Thanks rams for ur reply

My problem is 2d one . what i got some previous paper is that orifice canbe modleded as flow restriction . their is a value k whose has to mention in flunt but where i dont know if u have any idea please reply

kamini
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Old   January 25, 2007, 12:23
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rams
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what are u asking for i don't know please be a little clear
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Old   January 31, 2007, 16:51
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Jan
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Do you mean a orifice plate? If not, then there is no problem with just creating it as a single orifice.

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Old   February 3, 2007, 19:15
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gamal
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Dear sir

I am trying to model variable area orifice meter, the methodology is to use bluff body against the flow direction, and the system is connected to water tank 15m above the orifice level. My question how much I have to identify the operation pressure or I can use the atmospheric pressure. Thanks

The configuration in this link http://public.cranfield.ac.uk/me/me028/courses/process/

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Old   February 5, 2007, 01:39
Default Re: orifice problem
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Rams
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I guess u would be modelling only pipe flow with a variable area orifice meter, if then specify operating pressure a the pressure calculated at the point 15m below the water tank,

if u r including the modelling of water tank then take it as atmospheric pressure
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