I am trying to compare the fluid velocity given by the closed form solution and FEA analysis for fluid flowing through a channel that is 800u long and 100u wide.(adsbygoogle = window.adsbygoogle || []).push({});

I am using the equation vmax= (gradP)*(radius)^2/(4*viscosity)

I got 8.4cm/s in the former compared to ~10cm/s in the latter.

What could be the reason for the difference in both values. I thought of some like entrance length which is considerable compared, FEA has a square cross section instead of circular.

Am I right? Are there any more reasons. If so can I compensate for any of them using, say an extra term or longer channel (though FEA could take more time) etc.

Phew!!!Lot of questions

Shree

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# Comparison of FEA and closed form solution for fluid velocity in a channel

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