Biomedical Eng. HW Prob! Help!

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***Biomedical Eng. HW Prob! Help!***

Homework Statement


http://img11.imageshack.us/img11/3586/20582546.jpg [Broken]


Homework Equations





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.
 
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Answers and Replies

  • #2
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can anyone please help?
 
  • #3


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.
 
  • #4


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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