Answered: Composite tube wall: A thin electrical…

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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Question

Heat Transfer

Composite tube wall: A thin electrical heater (of negligible size) is inserted between a long
circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. The rod (A) has a thermal
conductivity of kA = 0.15 W/m.K, while the tube (B) has a thermal conductivity of kB = 1.5 W/m.K and its
outer surface is subjected to convection with a fluid of temperature T∞ = -10°C and a heat transfer coefficient
50 W/m2
.K. The thermal contact resistance between the cylinder surfaces and the heater is negligible.
a) Determine the electrical power per unit length of the cylinders (W/m) that is required to maintain the outer
surface of cylinder B at 5°C.
b) What is the temperature at the center of cylinder A?

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