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Math modelling of simple mass transfer problems – Illustrations

Math modelling of simple mass transfer problems – Illustrations

Math modelling of simple mass transfer problems –

ME6203 MASS TRANSPORT Examples of Math Modeling- Two Biomed Applications February 2009 Math modeling of simple mass transfer problems Illustrations ==================================================== 1) Estimate the average flow rate (velocity) in the stomach by measuring dissolution rate of a non-absorbing solute in the form of a spherical pill. Analyze the problem and explain how this could be done. State the assumptions. Assume net flow out of the stomach is negligible. (Sometimes referred to a churn flow) Solution: Assumptions 1) Dissolution rate expressed adequately by a mass transfer coefficient. “k”. 2) Pill remains spherical, same diameter over length of the experiment. 3) Stomach contents can be sampled with time 4) No chemical reaction 5) Mass flux is proportional to concentration driving force As time increases, c of solute in the stomach increases.

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