Question

state the factors that affect the rate of drying curve. With an aid of a graph depict the rate of drying curve and explain the phases depicted in the drying process.

Answer 1

Drying rate of a solid is affected by :

1) Temperature of the drying medium : More the temperature , higher the drying rate.

2) Humidity of drying medium : Lesser the humidity of gas used for drying purpose , more the rate of drying.

3) Flow rate of drying medium : Higher the flow, more the rate of drying.

4)Transport properties of the drying medium.

The picture attached below will explain the process in drying process : a) Constant drying period , b)1st falling period , c) 2nd falling period .

Two graphs , one X (moisture content) vs Time , second Rate of drying vs X (moisture content ) is shown in the adjoining diagram along with description of various phases is given with respect to second diagram.

For any further help , be free to question.