(a)
The rate of heat transfer of air by Equation
(a)
Explanation of Solution
Given:
The diameter
The length
The inlet temperature
The mass flow rate
The roughness
Calculation:
Refer to the table
Obtain the following properties of air corresponding to the temperature of
Further,
Calculate the mean velocity of air by using the relation.
Calculate the Reynolds number by using the relation.
Calculate the length of hydrodynamic boundary layer by using the relation.
Calculate the length of thermal boundary layer by using the relation.
The Reynolds number is greater than
Calculate the friction factor by using Colebrook equation.
Calculate the Nusselt number by using the Equation
Calculate the outlet temperature of the tube by using the relation.
Calculate the heat transfer by using the relation.
Thus, the rate of heat transfer of air by Equation
(b)
The rate of heat transfer of air by Equation
(b)
Explanation of Solution
Calculation:
Calculate the Nusselt number by using the Equation
Calculate the outlet temperature of the tube by using the relation.
Calculate the heat transfer by using the relation.
Thus, the rate of heat transfer of air by equation
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Chapter 19 Solutions
Fundamentals of Thermal-Fluid Sciences
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