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Microsoft PowerPoint - INTRODUCTION TO Types Of Heat Transfer

Microsoft PowerPoint - INTRODUCTION TO Types Of Heat Transfer

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INTRODUCTION TO Types of Heat Transfer Course By : Prof. Mohajer prepared by: S.M. rafigh 2011
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How ‘Heat’ Moves Review of past terms: Define “ Energy ”: The ability to do work or cause change. What is the basic unit of measure for energy? . Joules 2
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How ‘Heat’ Moves Define “ Heat ”: Heat is the movement of thermal energy from a substance at a higher temperature to another substance at a lower temperature. 3
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The Nature of Heat Heat moves in only one direction : Under normal conditions and in nature, heat energy will ALWAYS flow the warmer object to the cooler object. Heat energy will flow from one substance to another until the two substances have the same temperature. 4
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How ‘Heat’ Moves Thermal energy in the form of heat can move in three ways. Conduction Convection Radiation 5
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Conduction CONDUCTION : The transfer of heat from one particle of matter to another by direct particle to particle contact. Conduction occurs primarily in solids because the particles are tightly packed together. The particles themselves DO NOT change positions. 6
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Conduction Example: A metal spoon in a pot of water being heated on an electric stove. .a First, the electrical energy is converted to thermal energy by the stove. .b The rapidly vibrating particles of the hot with the particles of the collide electric coil cool pot. .c Heat energy is transferred, causing the particles in the pot to vibrate faster. 7
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Conduction .d collide The rapidly vibrating particles of the pot now with the particles of the water at the bottom of the pot. .e and vibrate and absorb energy The water particles flow more rapidly and its temperature increases. .f collide Now, the energetic (hot) particles of water with the particles of the submerged end of the spoon.
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