A critical flow nozzle with throat diameter of 2 mm is
Chapter , Problem 10.9(choose chapter or problem)
A critical flow nozzle with throat diameter of 2 mm is used to measure hydrogen flow rate to an atmospheric pressure burner. The pressure of hydrogen can be regulated. The upstream temperature is 20C. The supply pipe diameter has a 1 cm inside diameter. Assume that the discharge coefficient is 1.0. For hydrogen the specific heat ratio is 1.40. (a) Calculate the minimum pressure upstream of the nozzle for the flow to remain critical in the nozzle. (b) Calculate the mass flow rate and the volumetric flow (in SCMM) of hydrogen if the pressure upstream of the nozzle is 3 atm (gage). Assume that the discharge coefficient, C, is unity.
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