With a negligible velocity, air at 900 kPa and 400 K enters a converging nozzle. The nozzle's throat area is 10 cm2 (Figure Q1). Considering and stating the necessary assumptions, (a) calculate the exit pressure, exit velocity, and mass flow rate vs the back pressure Pb for 0.9 ≥ Pb ≥ 0.1 MPa, assuming the flow is isentropic. (b) Plot the graph of the exit pressure, exit velocity, and mass flow rate vs the back pressure Pb. Properties: The properties of air are k = 1.4, R = 0.287 kJ/kg·K, and cp = 1.005 kJ/kg·K. AIRV, = 0Figure Q1.

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Answered: With a negligible velocity, air at 900…

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter1: Heat, Temperature, And Pressure

Section: Chapter Questions

Problem 17RQ: Convert 22C to Fahrenheit.

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With a negligible velocity, air at 900 kPa and 400 K enters a converging nozzle. The nozzle's throat area is 10 cm2 (Figure Q1). Considering and stating the necessary assumptions,

(a) calculate the exit pressure, exit velocity, and mass flow rate vs the back pressure Pb for 0.9 ≥ Pb ≥ 0.1 MPa, assuming the flow is isentropic.
(b) Plot the graph of the exit pressure, exit velocity, and mass flow rate vs the back pressure Pb.

Properties: The properties of air are k = 1.4, R = 0.287 kJ/kg·K, and cp = 1.005 kJ/kg·K.

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