Rensselaer Polytechnic Institute
ENGR 2250
12-1 An undergraduate heat transfer lab has an experiment to illustrate the effects of different boundary
conditions on heat transfer from a flat plate. A test section is installed into a wind tunnel. The test section
consists of 100 thin strip heaters placed on a 2-m long flat plate. Each heater, 20-mm long and 250-mm
wide, is lo
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12-1 An undergraduate heat transfer lab has an experiment to illustrate the effects of different boundary
conditions on heat transfer from a flat plate. A test section is installed into a wind tunnel. The test section
consists of 100 thin strip heaters placed on a 2-m long flat plate. Each heater, 20-mm long and 250-mm
wide, is located so that there is no space between adjoining heaters and is electrically and thermally
insulated from the adjacent heaters; the backside of the plate is heavily insulated. The power to each heater
can be individually controlled. The free-stream air temperature is 25 ºC and has a velocity of 4 m/s. By
controlling the power to each strip, two different boundary conditions can be modeled. Ignoring radiation,
determine for strips 1, 5, 25, 100, and 200:
a. the heat transfer rate when the power is adjusted in each heater to maintain a uniform plate
temperature of 50 ºC (in W)
b. the wall temperature on strip number 25 when the power is adjusted in each heater to maintain a
uniform heat flux (equal to that on strip 25 from the first part) over the entire plate (in ºC).
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