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Homework Help: Biomedical Eng. HW Prob! Help!

  1. Sep 19, 2009 #1
    ***Biomedical Eng. HW Prob! Help!***

    1. The problem statement, all variables and given/known data
    http://img11.imageshack.us/img11/3586/20582546.jpg [Broken]


    2. Relevant equations



    3. The attempt at a solution

    all i know is the the sum of flow rate in is equal to the sum of flow rate out
    so i did
    0.1 mg/ml * 1200 ml/min = 1.5 ml/min*5 mg/ml + mass flow rate blood.
    and the m flow rate for blood is equal to 112.5 mg/min
    i really don't know what to do next..plz help.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 19, 2009 #2
    Re: ***Biomedical Eng. HW Prob! Help!***

    can anyone please help?
     
  4. Sep 22, 2009 #3
    Re: ***Biomedical Eng. HW Prob! Help!***

    first do an overall mass balance

    Vb=Vf+Vu

    then do your component balances

    cu,bVb=cu,fVf+cu,uVu
    cd,bVb=cd,fVf+cd,uVu

    here you only have 3 unknowns. plug and chug, but make sure your units match up since some of your givens are funky.
     
  5. Sep 23, 2009 #4
    Re: ***Biomedical Eng. HW Prob! Help!***

    one other thing to note in this problem is that we're not really doing a mass balance, but a volumetric flow balance. you can ONLY do volumetric flow balances when your density is constant, otherwise you must convert each stream into a mass flow rate!
     
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