A cylindrical piece of aluminum at 400C has a length 5 cm, cross-sectional area 1 cm,...
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A cylindrical piece of aluminum at 400°C has a length 5 cm, cross-sectional area 1 cm², and is being cooled by air at 20 °C. The average convective heat transfer coefficient at all sides is h=300 W/(m²K) and the thermal conductivity of aluminum is 240 W/(m K). Its density is 2700 kg/m³ and its specific heat capacity is 890 J/(kg°C). a. Determine the two Biot numbers (radial and axial) associated with this system. What do these values mean? b. How long will it take for the aluminum to reach 40°C? A cylindrical piece of aluminum at 400°C has a length 5 cm, cross-sectional area 1 cm², and is being cooled by air at 20 °C. The average convective heat transfer coefficient at all sides is h=300 W/(m²K) and the thermal conductivity of aluminum is 240 W/(m K). Its density is 2700 kg/m³ and its specific heat capacity is 890 J/(kg°C). a. Determine the two Biot numbers (radial and axial) associated with this system. What do these values mean? b. How long will it take for the aluminum to reach 40°C?
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a Radial Biot number Br h r k 300 Wm2K 005 m 240 Wm2K 00625 Axial Biot number Bz h L ... View the full answer
Related Book For
Personal Finance
ISBN: 9781264101597
14th Edition
Authors: Jack Kapoor, Les Dlabay, Robert Hughes, Melissa Hart
Posted Date:
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