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Everything about Mass diffusivity

Proportionality constant in some physical laws

Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion and the negative value of the gradient in the concentration of the species. More accurately, the diffusion coefficient times the local concentration is the proportionality constant between the negative value of the mole fraction gradient and the molar flux. This distinction is especially significant in gaseous systems with strong temperature gradients. Diffusivity derives its definition from Fick's law and plays a role in numerous other equations of physical chemistry. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Mass diffusivityA 5-minute orientation
  2. Skim a recent paper: Potential Pitfalls of Using Fractional Anisotropy, Axial Diffusivity, and Radial Diffusivity as Biomarkers of Cerebral White Matter MicrostructureInfluential work since 2022
  3. Pick up a classic book: DiffusionThe most-reprinted book on the subject
  4. Read the landmark paper: Flash Method of Determining Thermal Diffusivity, Heat Capacity, and Thermal ConductivityCited 3,604 times
  5. Go sideways: Chapman–Enskog theoryA closely related topic
  6. Go sideways: Coble creepA closely related topic

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🗂️ The subject at a glance

  1. Temperature dependence of the diffusion coefficient
  2. Pressure dependence of the diffusion coefficient
  3. Population dynamics: dependence of the diffusion coefficient on fitness
  4. Effective diffusivity in porous media
  5. Example values

🏆 Landmark papers (most cited)

🆕 Influential since 2022

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