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Solved: A long, cylindrical, electrical heating element of

Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman ISBN: 9780470501962 111

Solution for problem 7.49 Chapter 7

Introduction to Heat Transfer | 6th Edition

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Introduction to Heat Transfer | 6th Edition | ISBN: 9780470501962 | Authors: Theodore L. Bergman

Introduction to Heat Transfer | 6th Edition

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Problem 7.49

A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k 240 W/mK, density 2700 kg/m3 , and specific heat cp 900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27 C and 10 m/s, respectively. (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 W/m. (b) If the heater is activated from an initial temperature of 27 C, estimate the time required for the surface temperature to come within 10 C of its steady-state value.

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Weekly 3) Notes A- Baye'sRule Recap : - The NA eventinsample space conditionprobability S oftheeventtiventhe B, Be ... Bn )=P( ABDT .. .tP(ABN) oauranuqthfeventb . = AHBNK Lf PCBDPCAIBDT ..tP(Bn )P( partitions to FEB doesn'dependon B mutuallyexclusive ) ȼ to occur - inde

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Chapter 7, Problem 7.49 is Solved
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Textbook: Introduction to Heat Transfer
Edition: 6
Author: Theodore L. Bergman
ISBN: 9780470501962

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Solved: A long, cylindrical, electrical heating element of