l5 - CIVE 2700 Civil Engineering Materials, Winter 2007...

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CIVE 2700 – Civil Engineering Materials, Winter 2007 1 Thermal Properties Professor George Hadjisophocleous, Ph.D., P.Eng. Carleton University Department of Civil and Environmental Engineering Ottawa, Ontario CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.2 Outline • Objectives • Thermal Conductivity • Thermal Expansion • Specific heat
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CIVE 2700 – Civil Engineering Materials, Winter 2007 2 CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.3 Objectives • To learn important thermal properties of materials • To learn how these properties are affected by the atomic structure • Create an understanding of the impact of thermal properties on the performance of the final product CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.4 Introduction • Thermal properties indicate the response of a material to the application of heat. –Temperature increases –Melt or boil –Dimensions increase
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CIVE 2700 – Civil Engineering Materials, Winter 2007 3 CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.5 Introduction Thermal properties include: • Heat capacity • Thermal expansion • Thermal conductivity • Thermal stresses, thermal shock • A solid material when heated experiences an increase in temperature signifying that some energy has been absorbed. CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.6 Heat Capacity • Heat capacity is a property that indicates the ability of the material to absorb heat. • It represents the amount of energy required to increase the temperature of the material by a unit (one degree °C) • Specific heat capacity C : heat capacity per unit mass. dT dQ C ! " # K mol J $
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CIVE 2700 – Civil Engineering Materials, Winter 2007 4 CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.7 Heat Capacity • The amount of heat required to raise 1 kg of a substance 1 K depends on how the heating process is done • Heating at constant volume: the volume does not increase with the addition of heat, but the pressure and temperature increase – Specific heat at constant volume C v • Heating at constant pressure: the pressure is constant but the volume and temperature changes – Specific heat at constant pressure C p V P V P C C C C % e temperatur room at solids For vapours and gases For CIVE 2700 – Civil Engineering Materials, Winter 2007, 2.8 Heat Capacity • Energy causes increased vibrational energy of atoms causing traveling lattice waves (short wave lengths and high frequencies.) constant dependent e temperatur a is zero is K zero at A AT C C V V 3 !
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This note was uploaded on 11/13/2011 for the course CIVE 2*** taught by Professor - during the Spring '11 term at Carleton CA.

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l5 - CIVE 2700 Civil Engineering Materials, Winter 2007...

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