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