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example 6-1 - Example 6-1 Stainless steel parts(AISI 304...

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Example 6-1 Stainless steel parts (AISI 304) are heated in a furnace to a temperature of 850°C. Each part is brick-shaped with a height of 1 cm, a width of 1.5 cm and a length of 2 cm. The parts leave on a conveyor belt traveling at 3 cm/s and are cooled by air at 20°C. The convective heat transfer coefficient between the parts and the air is 138 W/m 2 ·°C. How far must a part travel from the furnace exit before it reaches 100°C? Assume the side of the part resting on the belt is perfectly insulated and the other five sides are exposed to the convective cooling. Solution: Check to see if the lumped system approximation is valid. Calculate characteristic length as ( )( )( ) () () () 2 1.5cm 1.0cm 2.0cm 1.5 2.0 2 1.5 1.0 2 2.0 1.0 cm char V L A == ++
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example 6-1 - Example 6-1 Stainless steel parts(AISI 304...

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