Heat Transfer
The Graetz number is concerned with the

heat transfer in turbulent flow
absorption with chemical reaction
heat transfer in laminar flow
mass transfer between a gas and a liquid

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Heat Transfer
Prandtl number is the ratio of

Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Momentum diffusivity to mass diffusivity
Thermal diffusivity to momentum diffusivity

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