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I would like to measure air flow rate. I have a orificemeter but do not know its coeficient of discharge. Will the Cd remain same for both the liquid and gases or it will be different.?

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The discharge coefficient is a function of many factors, therefore, it will not be the same for liquids and gases. The discharge coefficient is a ratio between the effective flow area and geometric flow area of an opening. The effective area changes based on fluid properties and compressibility effects. http://kb.eng-software.com/eskb/ask-an-engineer/theory-equations-and-calculated-results-questions/relationship-between-flow-coefficient-and-discharge-coefficient

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  • $\begingroup$ vena contracta is a term used by engineers. $\endgroup$
    – Solar Mike
    Sep 8 '20 at 16:12
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    $\begingroup$ I'm aware, I am an engineer. Thanks. $\endgroup$
    – mechcad
    Sep 8 '20 at 16:16
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If you want to test, you can use this online FREE orifice plate calculator..

FREE Orifice Plate Calculator

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