Explanation Given information: I r o n r o d : ρ = 7870 k g / m 3 , C P = 447 J / k g . k , k = 80.2 w/mk , α = 23.1 × 10 − 6 m 2 / s D i a m e t e r o f t h e rod : d = 25 m m I n i t i a l t e m p e r a t u r e o f r o d : - T i = 700 o C T e m p e r a t u r e o f w a t e r : T ∞ = 50 o C C o n v e c t i o n h e a t t r a n s f e r c o e f f i c i e n t : h = 128 w / m 2 k S u r f a c e t e m p e r a t u r e r e q u i r e d : T o = 200 o C Calculations: First, determine the Biot no of the system : B i = h L C k = h r o k B i = 128 × 12.5 × 10 − 3 80.2 = 0.02 From table A- 2, find the constants corresponding to B i = 0.02 i . e . λ 1 = 0

6th Edition

ISBN: 9781260699326

Author: CENGEL

Publisher: MCG

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Question

Chapter 4, Problem 63P

To determine

The time needed for the iron rod surface temperature to drop to 200^o C .

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Chapter 4, Problem 62EP

Chapter 4, Problem 64P

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Chapter 4 Solutions

HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT

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Ch. 4 - Consider a sphere and a cylinder of equal volume...Ch. 4 - Obtain relations for the characteristic lengths of...Ch. 4 - Obtain a relation for the time required for a...Ch. 4 - A brick of 20310257mm in dimension is being burned...Ch. 4 - Prob. 15P Ch. 4 - Prob. 16P Ch. 4 - Prob. 17P Ch. 4 - Metal plates...Ch. 4 - Prob. 19P Ch. 4 - Prob. 20P Ch. 4 - Prob. 21P Ch. 4 - A 6-mm-thick stainless steel strip...Ch. 4 - After heat treatment, the 2-cm-thick metal plates...Ch. 4 - A long copper rod of diameter 2.0 cm is initially...Ch. 4 - Prob. 25P Ch. 4 - Steel rods...Ch. 4 - Prob. 27P Ch. 4 - Prob. 28P Ch. 4 - To warm up some milk for a baby, a mother pours...Ch. 4 - A person is found dead at 5 p.m. in a room whose...Ch. 4 - Prob. 31P Ch. 4 - In an experiment, the temperature of a hot gas...Ch. 4 - Prob. 33P Ch. 4 - Pulverized coal particles are used in oxy-fuel...Ch. 4 - Oxy-fuel combustion power plants use pulverized...Ch. 4 - Plasma spraying is a process used for coating a...Ch. 4 - Consider a spherical shell satellite with outer...Ch. 4 - Prob. 38P Ch. 4 - Prob. 39P Ch. 4 - Prob. 40EP Ch. 4 - Consider a sphere of diameter 5 cm, a cube of side...Ch. 4 - Prob. 42P Ch. 4 - An egg is to be cooked to a certain level of...Ch. 4 - What is an infinitely long cylinder? 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The time needed for the iron rod surface temperature to drop to 200 o C .

The time needed for the iron rod surface temperature to drop to 200o C .

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Chapter 4 Solutions

The time needed for the iron rod surface temperature to drop to 200^o C .