# operating pressure and operating density

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 January 9, 2007, 06:19 operating pressure and operating density #1 phil Guest   Posts: n/a I am modeling a heat exchanger with two different fluids : water and another one with different. These two fluids do not mix up. How can I specify operating density for each of these fluids ? They are totally different. And if I don't specify operating density, what happens ? how fluent compute it ? Is it a different one for the 2 fluids ? Is there a way to see what the operating density computed by fluent is worth ? Thanx for any help.

 January 9, 2007, 09:37 Re: operating pressure and operating density #2 Sujith Guest   Posts: n/a For multiphase flows it is better to specify Operating density as the density of the lowest of two fluids. If any of the fluid is compressible operating density should be set as zero. By default, Fluent will compute the operating density by averaging over all cells -Sujith S Nair

 January 9, 2007, 10:20 Re: operating pressure and operating density *NM* #3 Sujith Guest   Posts: n/a

 January 11, 2007, 13:04 Re: operating pressure and operating density #4 phil Guest   Posts: n/a but it is not a multiphase flow, it is 2 fluids separated by a wall...

 April 5, 2014, 03:06 two operating pressure?!? #5 New Member   f bani Join Date: Dec 2012 Posts: 3 Rep Power: 7 Dear fluent-users I have the same problem; I have two different incompressible fluids in two pipes. These two streams don’t mix up. Each of them has a density (has an operation pressure). How I can specify that I have two different operating pressures or two different densities? Last edited by sso; April 6, 2014 at 04:16.

November 7, 2017, 18:02
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Hatef Khaledi
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Quote:
 Originally Posted by Sujith ;137994 For multiphase flows it is better to specify Operating density as the density of the lowest of two fluids. If any of the fluid is compressible operating density should be set as zero. By default, Fluent will compute the operating density by averaging over all cells -Sujith S Nair
Could you explain why the reference density should be set to zero for compressible fluid?

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