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 mourya September 10, 2007 06:19

how to calculate viscous and inertia resistance

Dear friends , pl help me in calculating viscous and inertia restance for know pressure drop and velocity.

velocity-m/sec pressure drop-pas 1.02 9.7 1.27 13.7 1.52 17.9 1.78 23.6 2.03 28.4 2.29 33.6 2.54 39.8 2.79 46

thanks with Regards

 Grey September 11, 2007 05:49

Re: how to calculate viscous and inertia resistanc

Using Darcy's pressure drop equation i guess

 Babar September 11, 2007 08:33

Re: how to calculate viscous and inertia resistanc

Look at Section 6.19 of the Fluent tutorial. You can use equations 6.19-16 and 6.19-17 to calculate the viscous and inertial resistances.

 chandra manik September 11, 2007 11:55

Re: how to calculate viscous and inertia resistanc

first you have to plot the value you get( pressure and flow) after that fitting those gprahic to find aproriate contant value

delta p = Av^2 +BV fitting this graphic using exel, you get the value of A and B you can get the value of C2(inertial resistance) and alfa (viscous resistance) by making relation

that : A= (C2*rho*delta n)/2

and B = (dynamic viscosity/alfa)* delta n

where n is thickness of your layer, filter or whatever as porous media

but be carefull, u fave to collect data in all porous open, half open and 25% open, so u can get data as when valve fully open, half and 25%

i hope this will help

correct me if i wrong

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