The thermal conductivity of a 2-mm-thick layer of skin is 1.5 J/s m.K. The temperature at the inside surface is 37°C and the temperature at the outside surface is 32°C. (a) What is the heat flux through the skin? (b) A cotton sweater with half the thermal conductivity of skin and twice the thickness of skin is placed on the outside surface of the skin. If the outside surface of the sweater is maintained at 30°C, what is the new heat flux through the skin and what is the temperature at the skin-sweater interface?
The thermal conductivity of a 2-mm-thick layer of skin is 1.5 J/s m.K. The temperature at the inside surface is 37°C and the temperature at the outside surface is 32°C. (a) What is the heat flux through the skin? (b) A cotton sweater with half the thermal conductivity of skin and twice the thickness of skin is placed on the outside surface of the skin. If the outside surface of the sweater is maintained at 30°C, what is the new heat flux through the skin and what is the temperature at the skin-sweater interface?
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:The thermal conductivity of a 2-mm-thick layer of skin is 1.5 J/s-m-K. The temperature at
the inside surface is 37°C and the temperature at the outside surface is 32°C.
(a) What is the heat flux through the skin?
(b) A cotton sweater with half the thermal conductivity of skin and twice the thickness of
skin is placed on the outside surface of the skin. If the outside surface of the sweater is
maintained at 30°C, what is the new heat flux through the skin and what is the
temperature at the skin-sweater interface?
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