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A hair dryer is basically a duct of constant diameter in
Chapter 5, Problem 13P(choose chapter or problem)
Problem 13P
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 dryer.
Questions & Answers
QUESTION:
Problem 13P
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 dryer.
ANSWER:
Step 1 of 4:
To determine the increase in the velocity air through the hair dryer.
As the hot air flows through the dryer, the air is heated up and the density reduces.
The density of air at the inlet ρ1 = 1.20 kg/m 3
The density of the air at the end ρ2 = 1.05 kg/m 3