Hey guys. I've been cracking whole day over this question to no avail. I mean I have no idea if it's correct or wrong. And I desperately have to get it done by tomorrow and it's already midnight here so would really appreciate any sort of help I can get. Here are the doubts that I'd like to clear. 1. Should it be counter flow or parallel flow? (I chose counter flow and I can't justify why) 2. Should the water fluids flowing from the inner or outer and why? (I chose inner and I can't justify why as well) 3. Is the term for inner tube called annulus? 3. Is the final answer obtained 6 sections? Thanks in advance!!