Mass Transfer
In physical terms, Schmidt number means

Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity
Mass diffusivity/thermal diffusivity
Momentum diffusivity/mass diffusivity

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Mass Transfer
Blowdown in a cooling tower

Is undesirable
All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Increases the scale forming tendencies of water

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