March 28, 2024, 09:29:27 AM
Forum Rules: Read This Before Posting


Topic: couette flow plz help  (Read 8568 times)

0 Members and 1 Guest are viewing this topic.

engchess

  • Guest
couette flow plz help
« on: May 31, 2006, 06:55:57 AM »
hiiii everyone ... i wish u can help me in this .. i have a mass transport project and it is about couette flow .. in the cylinder i have two fluid water and oil .. my dr. ask me a aquetstion to look after it he says why the water rotates around the oil why not the oppisite he give me a hint he says it is to minimize the energy but he want the princibple that states that ? .. can u help me do u have any idea about what principle he is talking about !

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27637
  • Mole Snacks: +1799/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: couette flow plz help
« Reply #1 on: May 31, 2006, 07:41:23 AM »
When water and oil separates - which one is at the bottom and why?
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

engchess

  • Guest
Re: couette flow plz help
« Reply #2 on: May 31, 2006, 11:36:57 AM »
when they are seperates i do not know , but he wants why when they are rotating in the cylinder the oil centerized the water

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27637
  • Mole Snacks: +1799/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: couette flow plz help
« Reply #3 on: May 31, 2006, 11:39:59 AM »
Reason is the same, just forces different. Think it over.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re: couette flow plz help
« Reply #4 on: May 31, 2006, 12:12:38 PM »
Compare their density. Which is "lighter"?

Where does the "lighter" component go?
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

engchess

  • Guest
Re: couette flow plz help
« Reply #5 on: May 31, 2006, 12:17:03 PM »
yeah i said the density thing ,but he said that beside this there is another reason about minimizing their energy and he wants the name of the principle that says so ..

Offline eugenedakin

  • Oilfield Consulting Chemist
  • Retired Staff
  • Full Member
  • *
  • Posts: 658
  • Mole Snacks: +88/-2
  • Gender: Male
  • My desk agrees with the law of entropy
    • Personal Website
Re: couette flow plz help
« Reply #6 on: June 04, 2006, 12:49:23 AM »
Hi engchess,

There is a part of Canada which produces oil which has a higher density than water (Oil density = 1.09, salt-water density = 1.01).  In this case the oil would be at the bottom.  I believe that almost all refined or natural oils have a density near or below 1.0. 

If I said all oils have a density below 1.0, someone would know of a exception-to-the-rule.

 ;)

Best of luck,

Eugene
There are 10 kinds of people in this world: Those who understand binary, and those that do not.

Sponsored Links