Question

What is the cause of convection heat transfer in evaporators?

(a) Convection is heat transfer by neutrons

(b) Convection is heat transfer by mass motion of a heat source

(c) Convection is mass transfer by mass motion of a fluid

(d) Convection is heat transfer by mass motion of a fluid

The question was posed to me in exam.

This interesting question is from Heat Transfer in Evaporators in section Evaporation of Food Processing Unit Operations

Answer 1

Correct choice is (d) Convection is heat transfer by mass motion of a fluid

To explain: Convection is heat transfer by mass motion of a fluid like water, air. Due to this movement the heated fluid moves away from the source of heat and thus carrying energy with it.