During air cooling of steel balls, the convection heat transfer coefficient is determined experimentally as a function of air velocity to be h = 17.9V 0.54 for 0.5 < V < 2 m/s, where h and V are in W/m2∙K and m/s, respectively. Consider a 24-mm-diameter steel ball initially at 300°C with a thermal conductivity of 15 W/m∙K. The steel balls are cooled in air at 10°C and a velocity of 1.5 m/s. Determine the initial values of the heat flux and the temperature gradient in the steel ball at the surface.
During air cooling of steel balls, the convection heat transfer coefficient is determined experimentally as a function of air velocity to be h = 17.9V 0.54 for 0.5 < V < 2 m/s, where h and V are in W/m2∙K and m/s, respectively. Consider a 24-mm-diameter steel ball initially at 300°C with a thermal conductivity of 15 W/m∙K. The steel balls are cooled in air at 10°C and a velocity of 1.5 m/s. Determine the initial values of the heat flux and the temperature gradient in the steel ball at the surface.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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During air cooling of steel balls, the convection heat
transfer coefficient is determined experimentally as a function
of air velocity to be h = 17.9V 0.54 for 0.5 < V < 2 m/s,
where h and V are in W/m2∙K and m/s, respectively. Consider
a 24-mm-diameter steel ball initially at 300°C with a thermal
conductivity of 15 W/m∙K. The steel balls are cooled in air at
10°C and a velocity of 1.5 m/s. Determine the initial values
of the heat flux and the temperature gradient in the steel ball
at the surface.
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