Stainless steel ball bearings (p=8085 kg/m², k=15.1 W/m°C, and C=0.480 kJ/kg.°C) having diameter of 1.2 cm are to be quenched in water. The ball leaving the oven at a uniform temperature of 900°C and is exposed to air at 30°C and with a convection coefficient of 125W/m².°C. Determine the time necessary to reach its surface to 850°C.
Stainless steel ball bearings (p=8085 kg/m², k=15.1 W/m°C, and C=0.480 kJ/kg.°C) having diameter of 1.2 cm are to be quenched in water. The ball leaving the oven at a uniform temperature of 900°C and is exposed to air at 30°C and with a convection coefficient of 125W/m².°C. Determine the time necessary to reach its surface to 850°C.
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 7.43P: 7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s...
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![Stainless steel ball bearings (p=8085
kg/m²,
kJ/kg.°C) having diameter of 1.2 cm are to
k=15.1 W/m°C, and C=0.480
be quenched in water. The ball leaving the
oven at a uniform temperature of 900°C
and is exposed to air at 30°C and with a
convection coefficient of 125W/m².°C.
Determine the time necessary to reach its
surface to 850°C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5ce04c2f-ea75-441c-8d23-e653db5b6509%2F81eb144c-eca0-485f-b992-8fa2cfd86f95%2Fc9hy2u_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Stainless steel ball bearings (p=8085
kg/m²,
kJ/kg.°C) having diameter of 1.2 cm are to
k=15.1 W/m°C, and C=0.480
be quenched in water. The ball leaving the
oven at a uniform temperature of 900°C
and is exposed to air at 30°C and with a
convection coefficient of 125W/m².°C.
Determine the time necessary to reach its
surface to 850°C.
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