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How to get flow rate in litre/minute in fluent

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Old   November 15, 2016, 14:46
Default How to get flow rate in litre/minute in fluent
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saurabh kumar gupta
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Hi all,
i am doing a 2-D simulation where i wish to get flow rate in litre/minute but in fluent i have no such option. for now i am use following conversion-

litre/minute=10^(-3)m^3/60s
(m^3/s)*density(Kg/m^3)=Kg/s

i just want to know, is this way of doing it correct or not?
thanks in advance.

regards
saurabh
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Old   November 15, 2016, 23:02
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Behrooz Jamshidi
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Hi
Go to define-> units->volume flow rate
make a new unit by putting its factor in regard to m3/s.
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Old   November 16, 2016, 05:04
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Hi,
Thanks for your kind reply. i hope this will help.
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Old   November 16, 2016, 06:00
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Hi,
i have checked my results but still i can not see flow rate in m^3/s in solution reports. where can i check volume flow rate in reports instead of mass flow rate?
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Old   November 16, 2016, 06:09
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Onur Özcan
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reports>volume integrals>
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Old   November 16, 2016, 06:16
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It is giving me only m^3. so should i consider it as m^3/s
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Old   November 16, 2016, 06:22
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reports>surface integrals>report type> volum flow rate,

or mass flow rate / density = it gives you ''volume flow rate''
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Old   November 16, 2016, 06:28
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Thanks, i get it.
but i have to define zero static pressure at outlet and some value for total pressure at inlet to get desired flow rate in m^3/s. so i am giving value 100 at inlet and zero at outlet and operating pressure is zero. are these BC's true or will give me wrong result?
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Old   November 16, 2016, 06:34
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So, let you re-correct me,

outlet is found in atmospheric field.Is it correct?. That's why you called it ''0'' (zero)

Operating pressure must not be 0, otherwise, that will be a ''vacuum''. Operating pressure is generally 1 atm.
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Old   November 16, 2016, 06:37
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The paper i am following states that zero static pressure at outlet, some value at inlet to get desired 5 litre/minute flow rate. in it there is no mention about operating pressure. but my geometry works for pressure range 80-120 mm Hg.
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Old   November 16, 2016, 06:43
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Well,

you need to define pressure_inlet BC. and gauge total pressure 100 bar( are you sure, watch out the unit!!), and supersonic/initial gauge pressure is 0,As for, outlet_pressure, gauge pressure is 0, target mass flow rate 5 lt/min (convert to kg/s)
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Old   November 16, 2016, 06:57
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i have done the simulation but the velocity contour has velocity very less velocity compare to original results. there maximum velocity is around 1m/s but mine maximum is coming 0.336m/s. so i am not able to figure out what is the problem here.
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Old   November 16, 2016, 07:02
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check scale your model in FLUENT. All dimensions are correct or not!,

Then, your fluid domain maybe should be extended if there is heat fluxed wall,

and which model have you defined?,turbulence or laminar, maybe you can need to change your model if you want to have correct result.
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Old   November 16, 2016, 09:00
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i have checked all dimensions are correct and using turbulence model. for your understanding i am attaching my case file here.

https://drive.google.com/file/d/0Byn...ew?usp=sharing
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Old   November 16, 2016, 11:27
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I have checked it, I am going to adjust
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