(a)
The plate midpoint temperature for a highly polished surface.
(a)
Explanation of Solution
Given:
The length of thin vertical plate
The heat flux
The temperature of air
The film temperature
The emissivity is
Calculation:
Refer Table A-22 “Properties of gases at 1 atm pressure”.
Obtain the following properties of air corresponding to the temperature of
Calculate the midpoint temperature
Calculate Characteristic length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the heat transfer coefficient
Calculate the plate midpoint temperature
Thus, the plate midpoint temperature for a highly polished surface is
(b)
The plate midpoint temperature for a black oxidized surface.
(b)
Explanation of Solution
Given:
The length of thin vertical plate
The heat flux
The temperature of air
The film temperature
The emissivity is
Calculation:
Refer Table A-22 “Properties of gases at 1 atm pressure”.
Obtain the following properties of air corresponding to the temperature of
Calculate the midpoint temperature
Calculate Characteristic length
Calculate the Rayleigh number
Calculate the Nusselt number
Calculate the heat transfer coefficient
Calculate the plate midpoint temperature
Thus, the plate midpoint temperature for a highly polished surface is
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