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Ünite 4: Fick's Law of Diffusion (Molar Flux) — Kelime Bul

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The ratio of the ••• of species A to the total ••• of all components in the mixture. Its spatial gradient drives the molar diffusion flux according to Fick's Law.

Mass Diffusivity (D_AB) — Also known as the binary diffusion constant, it measures how easily species A diffuses through species B. In the provided problem, the D_AB for a Helium-Nitrogen mixture is given as 0.687 x 10^-4 m^2/s.

Mole Fraction (x_A) — The ratio of the ••• of species A to the total ••• of all components in the mixture. Its spatial gradient drives the molar diffusion flux according to Fick's Law.

Mass Fraction (m_A) — The ratio of the ••• of species A to the total ••• of the mixture. The gradient of this parameter serves as the driving force for ••• flux in non-molar formulations.

Total Molar Concentration (c) — The sum of the ••• ••• of all species in a given volume (c = c_A + c_B). When treated as a constant, it simplifies the mathematical calculation of ••• diffusion fluxes.

Total Mass Density (rho) — The overall ••• per unit volume of the binary mixture. In ••• flux equations, a constant ••• ••• allows the flux to be expressed directly via ••• concentration derivatives.

Steady State — A condition in a mass transfer system where properties such as concentration, pressure, and temperature at any given point do not change over time, simplifying diffusion calculations.

Molecular Diffusion — The thermal motion of all (liquid or gas) particles at temperatures above absolute zero, causing net transport of mass from regions of higher concentration to regions of lower concentration, as seen with Helium in Nitrogen.