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Heat Transfer Overview

# Heat Transfer Overview - Conduction Heat Transfer Overview...

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1 Heat Transfer Overview Conduction Energy transfer from more to less energetic particles due to particle interactions – diffusion of energy due to molecular activity Examples Usually involves solids Rate = f( ) What is the driving potential? Fourier’s Law of Heat Conduction direction in x area unit per fer Heat trans direction in x fer heat trans Total dx dT k A q q dx dT kA q x " x x = = = k=thermal conductivity (W/m°C or Btu/h ft °F) -- a measure of how fast heat flows through a material -- k(T), but we usually use the value at the average temperature q can have x, y, and z components; it’s a vector quantity Special Case If T(x) is linear, Fourier’s Law for the 1-D case becomes When will this happen? Example " 2 1 2 1 2 1 x T T T T T q k k k x x x L = − = − Conduction Definitions Heat capacity = ρ c p (J/m 3 °C) Amount of heat needed to raise a unit volume of material one degree Thermal diffusivity = α = k/ ρ c p (m 2 /s) How fast heat diffuses through a material Convection

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Heat Transfer Overview - Conduction Heat Transfer Overview...

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