determining heat transfer coefficient experimentally by: clint collins alan day
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Determining heat transfer coefficient experimentally
By: Clint Collins Alan Day
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There are many times where there is not an experimental model from which to determine the convective heat transfer coefficient.
Objective
◦ Experimentally determine the amount of heat transferred from an aluminum block
◦ Determine the convective heat transfer coefficient
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Select a piece of aluminum Heat to 55°C Remove from oven Place on three points to minimize
conduction Take temperature readings every 300
seconds Calculate the heat transfer coefficient from
data
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Radiation is negligible Conduction is negligible Lumped capacitance is applicable Material is pure Aluminum
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Average q”=142.7 w/m^2
H=6.87w/m^2*K
There were inaccuracies in our measurements
The process used seems theoretically sound
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Use a thermocouple for temperature readings
Calculate conduction
Free Convection (Possible air movement)
Do multiple repetitions
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