5.52 A long rod 40 mm in diameter, fabricated from sapphire (aluminum oxide) and initially at a uniform temperature of 800 K, is suddenly cooled by a fluid at 300 K hav- ing a heat transfer coefficient of 1600 W/m² K. After 35 s, the rod is wrapped in insulation and experiences no heat losses. What will be the temperature of the rod after a long period of time? 5.15 Carbon steel (AISI 1010) shafts of 0.1-m diameter are heat treated in a gas-fired furnace whose gases are at 1200 K and provide a convection coefficient of 100 W/m². K. If the shafts enter the furnace at 300 K, how long must they remain in the furnace to achieve a centerline tem- perature of 800 K?
5.52 A long rod 40 mm in diameter, fabricated from sapphire (aluminum oxide) and initially at a uniform temperature of 800 K, is suddenly cooled by a fluid at 300 K hav- ing a heat transfer coefficient of 1600 W/m² K. After 35 s, the rod is wrapped in insulation and experiences no heat losses. What will be the temperature of the rod after a long period of time? 5.15 Carbon steel (AISI 1010) shafts of 0.1-m diameter are heat treated in a gas-fired furnace whose gases are at 1200 K and provide a convection coefficient of 100 W/m². K. If the shafts enter the furnace at 300 K, how long must they remain in the furnace to achieve a centerline tem- perature of 800 K?
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:5.52 A long rod 40 mm in diameter, fabricated from sapphire
(aluminum oxide) and initially at a uniform temperature
of 800 K, is suddenly cooled by a fluid at 300 K hav-
ing a heat transfer coefficient of 1600 W/m² K. After
35 s, the rod is wrapped in insulation and experiences
no heat losses. What will be the temperature of the rod
after a long period of time?
Transcribed Image Text:5.15 Carbon steel (AISI 1010) shafts of 0.1-m diameter are heat
treated in a gas-fired furnace whose gases are at 1200 K
and provide a convection coefficient of 100 W/m². K. If
the shafts enter the furnace at 300 K, how long must
they remain in the furnace to achieve a centerline tem-
perature of 800 K?
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