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What does this symbol Γ in the term div(ΓgradΦ) of the general transport equation mean?

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What does this symbol Γ in the term div(ΓgradΦ) of the general transport equation mean?

(a) Diffusion flux

(b) Convection coefficient

(c) Diffusion coefficient

(d) Rate of diffusion

This question was addressed to me in an internship interview.

The origin of the question is General Transport Equation in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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Correct answer is (c) Diffusion coefficient

Easiest explanation: Γ represents the diffusion coefficient. The diffusion coefficient is defined by Fick’s law of diffusion.

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