Question

Which of the following is an important parameter in sun drying rate?

(a) Convective heat transfer coefficient

(b) Conductive heat transfer coefficient

(c) Mass transfer coefficient

(d) Dynamic mass transfer coefficient

This question was addressed to me in an online quiz.

I want to ask this question from Sun Drying topic in division Drying of Food Processing Unit Operations

Answer 1

The correct answer is (a) Convective heat transfer coefficient

To explain: A portion of the sun radiation incident on the uneven surface of the groundnut reflects back into the environment. The remaining part of the sun energy is absorbed by the product surface and hence increases the product surface temperature which propagates the water vapor formation inside the product. Then the diffusion of water vapor gets started and the mass of the product decreases from the surface of the product.