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In mass transfer, flux is the amount of mass flowing through a unit area per unit time. Flux is represented by the symbol "J" and can be either molar flux (J) or mass flux (N). Molar flux (J) is the amount of moles of a component flowing through a unit area per unit time, while mass flux (N) is the amount of mass of a component flowing through a unit area per unit time. The key difference between the two is that molar flux is expressed in moles per unit area per unit time, while mass flux is expressed in kilograms per unit area per unit time.

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1mo ago
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7mo ago

In mass transfer, flux J is the amount of mass transferred per unit area per unit time, while concentration gradient N is the driving force for mass transfer. J is directly proportional to N according to Fick's first law of diffusion, which relates the flux to the concentration gradient.

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11y ago

N is avg molar flux of constituent relative to a fixed location in space and J is molar flux of constituent relative to avg molar velocity of all constituents.

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Q: What is the difference between fluxs J and N in mass transfer?
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