Only question 10.6 Problems 38310.4 Estimate the uncertainty of flow measurement in Problem 10.2 if the uncertainty in dis-charge coefficient and pressure measurement are estimated to be 1% and 1.5%, respec-tively. The uncertainties in other parameters are considered to be negligible.10.5 A machined entrance cone venturi is to be used to measure the airflow rate in a 10-cm-IDpipe. The minimum area of the meter is 7.5 cm. The pressure drop across the venturi is 10 kPa.Calculate the volumetric flow [in standard cubic meter per minute (SCMM)] and mass flowrate (kg/min) of air. The condition of air upstream of the venturi is 700 kPa and 25°C.10.6 A machined entrance cone venturi is to be used to measure the airflow rate in a 4-in-IDpipe. The minimum area of the meter is 3 in. The pressure drop across the venturi is 1 psi.Calculate the volumetric flow [in standard cubic feet per minute (SCFM)] and mass flowrate (lbm/min) of air. The condition of air upstream of the venturi is 100 psia and 70°F.10.7 A critical flow nozzle with a throat diameter of 5 mm is used to measure the flow of air. Airpressure and temperature upstream of the nozzle are 7 atm (gage) and 20°C. Calculate themass flow rate and the volumetric flow rate (in SCMM) of air. At what maximum pressuredownstream of the nozzle will this calculation be acceptable?10.8 A critical flow nozzle with a throat diameter of 0.3 in. is used to measure the flow of air.Air pressure and temperature upstream of the nozzle are 7 atm (gage) and 70°F. Calculatethe mass flow rate and the volumetric flow rate (in SCFM) of air. At what maximum pres-sure downstream of the nozzle will this calculation be acceptable?10.9 A critical flow nozzle with throat diameter of 2 mm is used to measure hydrogen flow rateto an atmospheric pressure burner. The pressure of hydrogen can be regulated. Theupstream temperature is 20°C. 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 criti-cal in the nozzle.(b) Calculate the mass flow rate and the volumetric flow (in SCMM) of hydrogen if thepressure upstream of the nozzle is 3 atm (gage). Assume that the discharge coeffi-cient, C, is unity.10.10 A critical flow nozzle is to be used to measure the airflow rate into a variable pressurechamber. The air in the line is at 8 atm, 20°C.(a) Determine the chamber pressure above which the critical flow nozzle cannot be usedaccurately for airflow measurement.(b) Determine the diameter of the nozzle for a flow rate of 100 standard cubicperminute.(c) Calculate the mass flow rate of air for this condition. Assume that the discharge coef-ficient, C, is unity.10.11 Acritical flow nozzleis used to measure the mass flow rate of air(y = 1.4, R =287 J/kg-K). The pipe diameter is 3 cm and the nozzle diameter is 1 cm. Thepressure downstream of the nozzle is 100 kPa (abs) and the pressure in the pipe upstreamof the nozzle is 500 kPa (abs). The upstream temperature is 400 K. Estimate the mass flowrate assuming that the discharge coefficient, C, is unity.10.12 A critical flow nozzle is used to measure the mass flow rate of air (y = 1.4,R = 53.34 Btu/lbm-R). The pipe diameter is 1 in. and the nozzle diameter is 0.3 in. The pres-eam of the nozzle is 14.70 psi (abs) and the pressure in the pipe upstream of thei (abs). Tham temperature is 250°F. Estimate the mass flow rate, assum-C is unity.sure downeschar

The diameter of the pipe is D=4 in The minimum diameter is d=3 in. The pressure drop is ∆P=1 psi.…

10.6 A machined entrance cone venturi is to be used to measure the airflow rate in a 4-in-ID pipe. The minimum area of the meter is 3 in. The pressure drop across the venturi is 1 psi. Calculate the volumetric flow [in standard cubic feet per minute (SCFM)] and mass flow rate (lbm/min) of air. The condition of air upstream of the venturi is 100 psia and 70°F.

10.6 A machined entrance cone venturi is to be used to measure the airflow rate in a 4-in-ID pipe. The minimum area of the meter is 3 in. The pressure drop across the venturi is 1 psi. Calculate the volumetric flow [in standard cubic feet per minute (SCFM)] and mass flow rate (lbm/min) of air. The condition of air upstream of the venturi is 100 psia and 70°F.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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