Component Transfer Mechanisms

Component Transfer Mechanisms - Mass Transfer Mechanisms of...

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1 Mass Transfer Mechanisms of Components Phase and component mass transfer () . t ρ =− ∇ u Equation of continuity: total mass of a phase A phase containing more than one component Define the mass fractions of component A and B AB mm ωω == ++ The mass fluxes of A and B, respectively A AA A B BB B ωρ = = uu Single phase, 2 components A u B u u Mass Transfer Mechanisms of Components Phase and component mass transfer Single phase, 2 components, homogenous component distribution For a homogeneous distribution of A and B in the phase (uniform mixture) A B ρρ ω += + = uuu u Phase velocity is the mass average velocity
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2 Mass Transfer Mechanisms of Components Phase and component mass transfer Single phase, 2 components, inhomogeneous component distribution For an inhomogeneous distribution of A and B in the phase A AA BB B ρ uu This difference is due to molecular diffusion. The diffusive mass flux may thus be defined ( ) ( ) A B ρρ =− Ju u u For a binary system A B = − JJ
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Component Transfer Mechanisms - Mass Transfer Mechanisms of...

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