A flat slab of rubber 1 inch thick, at an initial temperature of 70 degF is placed between two heated steel plates maintained at 280 degF. The heating is discontinued when the temperature at the midplane of the slab reaches 270 degF. The thermal conductivity of rubber is 0.092 and thermal diffusivity of 0.0029 sqft/hr, respectively. In the Gurney and Lurie chart, the Fourier number is X=1.35. How many hours is the heating period time? What is the temperature in deg F of the rubber if it is 0.25 inch from the metal at the end of the run? How long will it take in hours for the rubber to reach a temperature of 270 degF?
A flat slab of rubber 1 inch thick, at an initial temperature of 70 degF is placed between two heated steel plates maintained at 280 degF. The heating is discontinued when the temperature at the midplane of the slab reaches 270 degF. The thermal conductivity of rubber is 0.092 and thermal diffusivity of 0.0029 sqft/hr, respectively. In the Gurney and Lurie chart, the Fourier number is X=1.35. How many hours is the heating period time? What is the temperature in deg F of the rubber if it is 0.25 inch from the metal at the end of the run? How long will it take in hours for the rubber to reach a temperature of 270 degF?
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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A flat slab of rubber 1 inch thick, at an initial temperature of 70 degF is placed between two heated steel plates maintained at 280 degF. The heating is discontinued when the temperature at the midplane of the slab reaches 270 degF. The thermal conductivity of rubber is 0.092 and thermal diffusivity of 0.0029 sqft/hr, respectively. In the Gurney and Lurie chart, the Fourier number is X=1.35.
How many hours is the heating period time?
What is the temperature in deg F of the rubber if it is 0.25 inch from the metal at the end of the run?
How long will it take in hours for the rubber to reach a temperature of 270 degF?
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