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Peclet number is a ratio of _________ strength to the _________ strength.

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Peclet number is a ratio of _________ strength to the _________ strength.

(a) Diffusive, convective

(b) Convective, diffusive

(c) Radiative, diffusive

(d) Diffusive, radiative

This question was addressed to me in semester exam.

This intriguing question comes from Discretization Aspects in portion Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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The correct answer is (b) Convective, diffusive

Explanation: Peclet number defines how much convection flux dominates the diffusion flux of fluid flow. It will decide if the transport of flow property is because of convection or diffusion.

\(Peclet\, number=\frac{Convective\, strength}{Diffusive\, strength}\).

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