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orifice length and pressure drop

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Old   June 10, 2013, 03:11
Default orifice length and pressure drop
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Hay all,
does there exist some correlation which shows the dependence of presure drop across orifice with different length?
For example short orifices can be designed using standard equation with orifice discharge coefficient at longer orifices the pressure drops is similar to pressure drop in staright pipes.
for all answers thank you
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