Q2/A stainless stcel ball (p = 8055 kg/m3, Cp= 480 J/kg °C) of diameter D = 15 cm is removed from the oven at a uniform temperature of 350°C. The ball is then subjected to the flow of air at 1 atm pressure and 30°C with a velocity of 6 m/s. The surface temperature of the ball eventually drops to 250°C. Determine the average convection heat transfer coefficient during this cooling process and estimate how long this process has taken. Ans =23.75 min
Q2/A stainless stcel ball (p = 8055 kg/m3, Cp= 480 J/kg °C) of diameter D = 15 cm is removed from the oven at a uniform temperature of 350°C. The ball is then subjected to the flow of air at 1 atm pressure and 30°C with a velocity of 6 m/s. The surface temperature of the ball eventually drops to 250°C. Determine the average convection heat transfer coefficient during this cooling process and estimate how long this process has taken. Ans =23.75 min
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.4P
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![Q2/A stainless steel ball (p 8055 kg/m3, Cp- 480 J/kg C) of diameter D 15 cm is removed
from the oven at a uniform temperature of 350°C. The ball is then subjected to the flow of air at 1
atm pressure and 30°C with a velocity of 6 m/s. The surface temperature of the ball eventually
drops to 250°C. Determine the average convection heat transfer coefficient during this cooling
process and estimate how long this process has taken.
Ans =23.75 min](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6a7a5aad-f555-4308-878d-85ccceb47203%2Fa63fe9d8-85be-4fd6-91e1-b462e7bff11e%2Fmgl5cde_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q2/A stainless steel ball (p 8055 kg/m3, Cp- 480 J/kg C) of diameter D 15 cm is removed
from the oven at a uniform temperature of 350°C. The ball is then subjected to the flow of air at 1
atm pressure and 30°C with a velocity of 6 m/s. The surface temperature of the ball eventually
drops to 250°C. Determine the average convection heat transfer coefficient during this cooling
process and estimate how long this process has taken.
Ans =23.75 min
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