Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5, Problem 17P
A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. A small fan pulls the air in and forces it through the resistors where it is heated. If the density of air is 1.20 kg/m3 at the inlet and 1.05 kg/m3 at the exit. determine the percent increase in the velocity of air as it flows through the hair dryer.
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A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. A small fan pulls the air in and forces it through the resistors where it is heated. If the density of air is 1.20 kg/m3 at the inlet and 1.05 kg/m3 at the exit, determine the percent increase in the velocity of air as it flows through the hair dryer.
Chapter 5 Solutions
Fluid Mechanics Fundamentals And Applications
Ch. 5 - Name four physical quantities that are conserved...Ch. 5 - Define mass and volume flow rates. How are they...Ch. 5 - Does the amount of mass entering a control volume...Ch. 5 - When is the flow through a control volume steady?Ch. 5 - Consider a device with one inlet and one outlet....Ch. 5 - In climates with low night-time temperatures, an...Ch. 5 - A garden hose attached with a nozzle is used to...Ch. 5 - Air whose density is 0.082 Ibm/ft3 enters the duct...Ch. 5 - A 0.7$-m3 rigid tank initially contains air whose...Ch. 5 - Consider the flow of an incompressible Newtonian...
Ch. 5 - Consider a fully filled tank of semi-circular...Ch. 5 - Prob. 12PCh. 5 - Prob. 13PCh. 5 - The minimum fresh air requirement of a residential...Ch. 5 - Air enters a nozzle steadily at 2.21 kg/m3 and 20...Ch. 5 - Air at 40°C flow steadily through the pipe shown...Ch. 5 - A hair dryer is basically a duct of constant...Ch. 5 - Define turbine efficiency, generator efficiency,...Ch. 5 - What is mechanical efficiency? What does a...Ch. 5 - How is the combined pump-motor efficiency of a...Ch. 5 - What is mechanical energy? How does it differ from...Ch. 5 - Prob. 22PCh. 5 - A differential thermocouple with sensors at the...Ch. 5 - Electric power is to be generated by installing a...Ch. 5 - Consider a river flowing toward a lake at an...Ch. 5 - Water is pumped from a lake to a storage tank 18 m...Ch. 5 - Prob. 28CPCh. 5 - Express the Bernoulli equation in three different...Ch. 5 - What are the three major assumptions used in the...Ch. 5 - Define static, dynamic, and hydrostatic pressure....Ch. 5 - What is streamwise acceleration? How does it...Ch. 5 - What is stagnation pressure? Explain how it can be...Ch. 5 - Prob. 34CPCh. 5 - How is the location of the hydraulic grade line...Ch. 5 - Prob. 36CPCh. 5 - What is the hydraulic grade line? 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Determine the flow rate of...Ch. 5 - A 78-percent efficient 12-hp pump is pumping water...Ch. 5 - The demand for electric power is usually much...Ch. 5 - When a system is subjected to a linear rigid body...Ch. 5 - A fireboat is to fight fires at coastal areas by...Ch. 5 - The velocity of a liquid flowing in a circular...Ch. 5 - Air at 250 kgrn3 enters a nozzle that has an...Ch. 5 - The water level in a tank is 70 ft above the...Ch. 5 - A pressurized 2-rn-diameter tank of water has a...Ch. 5 - Air flows through a pipe at a rate of 120 L/s. The...Ch. 5 - A very large tank contains air at 102 kPa at a...Ch. 5 - Water is flowing through a Venturi meter whose...Ch. 5 - Water flows at a rate of 0.011 m3/s in a...Ch. 5 - The air in a 6-m × 5-m × 4-m hospital room is to...Ch. 5 - Underground water is being pumped into a pool...Ch. 5 - A 3-rn-high large tank is initially filled with...Ch. 5 - Reconsider Prob. 5-105. 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