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Friday, August 14, 2020 4:26 PM: Chapter 2 Page 1

This document discusses heat conduction and thermal properties of matter. It introduces Fourier's law of heat conduction, which states that the rate of heat transfer through a material is proportional to the negative temperature gradient in the material and the area, and discusses how thermal conductivity depends on factors like crystal structure, purity, and electrical resistivity. Sample problems demonstrate using the conduction rate equation to calculate heat transfer rates. Tables of thermal conductivity values are provided for various metals and nonmetals.

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AMARTYA MONDAL
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41 views11 pages

Friday, August 14, 2020 4:26 PM: Chapter 2 Page 1

This document discusses heat conduction and thermal properties of matter. It introduces Fourier's law of heat conduction, which states that the rate of heat transfer through a material is proportional to the negative temperature gradient in the material and the area, and discusses how thermal conductivity depends on factors like crystal structure, purity, and electrical resistivity. Sample problems demonstrate using the conduction rate equation to calculate heat transfer rates. Tables of thermal conductivity values are provided for various metals and nonmetals.

Uploaded by

AMARTYA MONDAL
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Introduction to Conduction

Friday, August 14, 2020 4:26 PM

Chapter 2 Page 1
Introduction to Conduction
Friday, August 14, 2020 4:26 PM

Chapter 2 Page 2
Fourier's Law of Heat Conduction
Friday, August 14, 2020 12:04 PM

Chapter 2 Page 3
Sample Problem
Friday, August 14, 2020 11:57 AM

Chapter 2 Page 4
Sample Problem
Friday, August 14, 2020 11:59 AM

Chapter 2 Page 5
The Conduction Rate Equation
Friday, August 14, 2020 12:07 PM

Chapter 2 Page 6
The Conduction Rate Equation
Friday, August 14, 2020 12:07 PM

Chapter 2 Page 7
Thermal Properties of Matter
Friday, August 14, 2020 12:07 PM

Chapter 2 Page 8
Thermal Properties of Matter
Friday, August 14, 2020 12:07 PM

To a first approximation, ke is inversely proportional to the


electrical resistivity.

For pure metals, which are of low resistivity, ke is much


larger than kph.

In contrast, for alloys, which are of substantially resistivity,


the contribution of kph to k is no longer negligible.

For nonmetallic solids, k is determined primarily by kph.

The regularity of the lattice arrangement has an important


effect on kph, with crystalline (well-ordered) materials like
quartz having a higher thermal conductivity than
amorphous materials like glass.

In fact, for crystalline, nonmetallic solids such as diamond


and beryllium oxide, kph can be quite large, exceeding
values of k associated with good conductors, such as
aluminum and copper.

Values for selected materials of technical importance


are also provided in Table A.1 (metallic solids) and Tables
A.2 and A.3 (nonmetallic solids).

Chapter 2 Page 9
Thermal Properties of Matter
Friday, August 14, 2020 12:07 PM

Chapter 2 Page 10
Thermal Properties of Matter
Friday, August 14, 2020 12:07 PM

Chapter 2 Page 11

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