Q: What is natural convection? How does it differ from forced convection
What is natural convection? How does it differ from forced convection? What force causes natural convection currents?
See AnswerQ: Consider a refrigeration truck traveling at 70 mph at a location where
Consider a refrigeration truck traveling at 70 mph at a location where the air temperature is 80°F. The refrigerated compartment of the truck can be considered to be a 9-ft-wide, 7-ft high,...
See AnswerQ: A 10-cm × 10-cm plate has a constant
A 10-cm × 10-cm plate has a constant surface temperature of 150°C. Determine the Grashof number if the chip is placed in the following fluids: air (1 atm, 30°C), liquid water (30°C), engine oil (10°C...
See AnswerQ: Consider a hot automotive engine, which can be approximated as a
Consider a hot automotive engine, which can be approximated as a 0.5-m-high, 0.40-m-wide, and 0.8-m-long rectangular block. The bottom surface of the block is at a temperature of 100°C and has an emis...
See AnswerQ: Two concentric spheres with diameters of 5 cm and 10 cm are
Two concentric spheres with diameters of 5 cm and 10 cm are having the surface temperatures maintained at 200°C and 100°C, respectively (see Fig. P20–100). The...
See AnswerQ: Water is pumped from a 200-ft-deep well into
Water is pumped from a 200-ft-deep well into a 100-ft high storage tank. Determine the power, in kW, that would be required to pump 200 gal/min.
See AnswerQ: A 5-m-long strip of sheet metal is being
A 5-m-long strip of sheet metal is being transported on a conveyor at a velocity of 5 m/s, while the coating on the upper surface is being cured by infrared lamps. The coating on the upper surface of...
See AnswerQ: A long 2-in-diameter rod with surface temperature of
A long 2-in-diameter rod with surface temperature of 200°F is submerged in a bath of fluid. Determine the Grashof and Rayleigh numbers if the fluid is (a) liquid water at 40°F, (b) liquid ammonia at 4...
See AnswerQ: Reconsider Prob. 19–23. Using appropriate software, evaluate
Reconsider Prob. 19–23. Using appropriate software, evaluate the effect of the sheet metal velocity on its surface temperature. By varying the sheet metal velocity from 3 to 30 m/s,...
See AnswerQ: Will a hot horizontal plate whose back side is insulated cool faster
Will a hot horizontal plate whose back side is insulated cool faster or slower when its hot surface is facing down instead of up?
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