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Heat Transfer - Engineering

Q1:

Prandtl number is the reciprocal of

A Thermal diffusivity/Momentum diffusivity

B thermal diffusivity x Momentum

C Thermal diffusivity x Mass diffusivity

D Mass diffusivity x Momentum diffusivity

ANS:A - Thermal diffusivity/Momentum diffusivity

The Prandtl number (𝑃𝑟Pr) is the ratio of momentum diffusivity to thermal diffusivity, so it is the reciprocal of the ratio of thermal diffusivity to momentum diffusivity. Therefore, the correct option is: Thermal diffusivity / Momentum diffusivity.