18.4 Cast-iron cannonballs used in the War of 1812 were occasionally heated for some extended time so that, when fired at houses or ships, they would set them afire. If one of these, the so-called "hot shot," were at a uniform temperature of 2000 F, how long after being exposed to air at 0 F with an outside convective heat-transfer coefficient of 16 Btu/h ft² F, would be required for the surface temperature to drop to 600 F? What would be the center temperature at this time? The ball diameter is 6 in. The following properties of cast iron may be used: k = 23 Btu/h ft F cp = 0.10 Btu/lbm F p = 460 lb/ft³.
18.4 Cast-iron cannonballs used in the War of 1812 were occasionally heated for some extended time so that, when fired at houses or ships, they would set them afire. If one of these, the so-called "hot shot," were at a uniform temperature of 2000 F, how long after being exposed to air at 0 F with an outside convective heat-transfer coefficient of 16 Btu/h ft² F, would be required for the surface temperature to drop to 600 F? What would be the center temperature at this time? The ball diameter is 6 in. The following properties of cast iron may be used: k = 23 Btu/h ft F cp = 0.10 Btu/lbm F p = 460 lb/ft³.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:18.4 Cast-iron cannonballs used in the War of 1812 were
occasionally heated for some extended time so that, when
fired at houses or ships, they would set them afire. If one of
these, the so-called "hot shot," were at a uniform temperature
of 2000 F, how long after being exposed to air at 0 F with an
outside convective heat-transfer coefficient of 16 Btu/h ft² F,
would be required for the surface temperature to drop to 600
F? What would be the center temperature at this time? The
ball diameter is 6 in. The following properties of cast iron
may be used:
k = 23 Btu/h ft F
cp = 0.10 Btu/lbm F
p = 460 lb/ft³.
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