determining heat transfer coefficient experimentally by: clint collins alan day
Post on 19-Jan-2016
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Determining heat transfer coefficient experimentally
By: Clint Collins Alan Day
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
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
Radiation is negligible Conduction is negligible Lumped capacitance is applicable Material is pure Aluminum
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
Use a thermocouple for temperature readings
Calculate conduction
Free Convection (Possible air movement)
Do multiple repetitions
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