Energy Transfer Mechnisms

Energy Transfer Mechnisms - Mechanisms of Energy Transfer...

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1 Mechanisms of Energy Transfer Mechanisms of energy transfer Energy transfer by works xx xy xz yx yy yz z xz y z z p p p ττ τ ⎛⎞ + ⎜⎟ =+ + ⎝⎠ π y z x Heat sources Energy influxes (inward arrows) Energy outfluxes (outward arrows) P(x,y,z) Mechanisms of energy transfer Energy transfer by works - Rate of work done by viscous forces per unit area of i-plane - Rate of work done by pressure force per unit area of i-plane - Rate of work done by gravitational force per unit volume () , , + = v ii x x i y y i z z wu u u i x y z τττ p wp u = ( ) g x xy yz z g u g u g ρρρ + ( ) 222 where ˆ ( ) 2 ++ += x Ki K uuu EU u E ρρ ρ Energy transfer by convection - Rate of kinetic and internal energy carried by mass flow per unit area Mechanisms of Energy Transfer
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2 A combination of energy fluxes: enthalpy () ˆ ˆˆ ˆ ˆ ˆ ( ) Ki p K iK i i K i K i H EH u E wE U u U p u E p Uu E Upu ρρ ρ ρυ ⎛⎞ ++ = + + ⎜⎟ ⎝⎠ ⎡⎤ =+ + ⎢⎥ ⎣⎦ + = + ±²³ ˆ H Mechanisms of energy transfer Mechanisms of Energy Transfer Enthalpy expressions for different fluids
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Energy Transfer Mechnisms - Mechanisms of Energy Transfer...

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