Question

Name the phenomenon which transfers moisture during second falling drying rate period?

(a) Liquid diffusion

(b) Capillary movement

(c) Vapor diffusion

(d) Liquid diffusion, capillary movement, and vapor diffusion.

The question was asked in homework.

I'd like to ask this question from Drying Rate topic in portion Drying of Food Processing Unit Operations

Answer 1

The correct option is (d) Liquid diffusion, capillary movement, and vapor diffusion.

Explanation: During second falling drying rate period, the moisture transfer is due to the liquid diffusion, capillary movement, and vapor diffusion because the drying rate becomes independent of conditions outside the solid.