Interview QnA#7 Why the hot liquid or cool liquid in heat exchanger, reactor jacket should flow from bottom to top?

QnA#7 Why the hot liquid or cool liquid  in heat exchanger, reactor jacket should flow from bottom to top?

Answer
If we pass the liquid from top to bottom, it will flow fast by gravity itself. So it will have less contact time with the heat exchanger or reactor surface which will result in poor heat transfer.

That’s why the hot or cool fluid should be passed from bottom to top to maximize the contact time. The same is applicable for cold fluid also in reactors