Question

Plug flow contains _______________

(a) There is mixing

(b) There is variation

(c) There is no mixing but variation

(d) There is neither mixing nor variation

This question was addressed to me in an online interview.

Question is taken from Sterilisation in chapter Reactor Engineering of Bioprocess Engineering

Answer 1

Right choice is (d) There is neither mixing nor variation

For explanation: The type of flow in pipes where there is neither mixing nor variation in fluid velocity is called Plugflow. Plug flow is an ideal flow pattern; in reality, fluid elements in pipes have a range of different velocities.