Heat Transfer
In a backward feed multiple effect evaporator

Feed is introduced in the first effect
No pumps are required between successive effects
Feed flows from low pressure to high pressure
None of these

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Heat Transfer
Prandtl number is the ratio of

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

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