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I have used an orifice for my project to measure the pressure difference and hence the mass flow rate of air going through a pipe of 26 mm diameter. i kept changing the flow from max to min and ended up with values of pressure diference. The questions here is how to convert thses values ( in meters) into mass flow rate (kg/s) ?? I tried to find equations for this but they have the coefficient of discharge involved and i cannot find this value !! can any one help me on this plz ?

regards

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# Orifice calculations

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