Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Higher economy
Both A & B
Lower capacity
Lower economy

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Heat Transfer
Prandtl number is the ratio of

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

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