EBK APPLIED FLUID MECHANICS
EBK APPLIED FLUID MECHANICS
7th Edition
ISBN: 9780100668348
Author: UNTENER
Publisher: YUZU
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Chapter 18, Problem 18.37PP
To determine

The minimum pressure required to produce sonic velocity.

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A double-tank system in Fig. has two identical convergingnozzles of 1-in2 throat area. Tank 1 is very large,and tank 2 is small enough to be in steady-flow equilibriumwith the jet from tank 1. Nozzle flow is isentropic,but entropy changes between 1 and 3 due to jet dissipationin tank 2. Compute the mass flow.
At the point where the air enters the convergent nozzle, its static pressure is 150 kPa, its stopping temperature is 327 K, and its speed is 71 m/s. If the nozzle opens to an environment with a back pressure of 100 kPa, the static pressure at the outlet section and What is the Mach number?
An impulse turbine develops 5000 HP where the nozzle is located 15 meters above tailwater. Water flows through a 1 meter diameter penstock at a velocity of 1.5 m/s. The turbine efficiency is 85% and the generator efficiency is 95%. If the head loss is 10% of the gross head, calculate the pressure (kPa) at the base of the 250mm nozzle diameter and the elevation (m) of the water source above the tailwater.
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