Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Flow rate of inlet air
Humidity of inlet air
Temperature of the solid
Relative humidity of outlet air

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

They are always equal under all circumstances
Water has a high latent heat of evaporation
Solubility of the components of air in water is very small
Lewis number is close to unity

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