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The Prandtl Number approximates ___________ (a)Momentum diffusivity to thermal diffusivity

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in Fluid Mechanics by (118k points)
The Prandtl Number approximates ___________

(a) Momentum diffusivity to thermal diffusivity

(b) Thermal diffusivity to momentum diffusivity

(c) Shear stress to thermal diffusivity

(d) Thermal diffusivity to kinematic viscosity

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This interesting question is from Area Velocity Relationship for Compressible Flow topic in portion Compressible Flow of Fluid Mechanics

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Right answer is (a) Momentum diffusivity to thermal diffusivity

Explanation: The Prandtl number is a dimensionless number. It approximates the ratio of momentum diffusivity to thermal diffusivity. It can be expressed as Pr = v/ α(1).  Where α= thermal diffusivity and v= momentum diffusivity.

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