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Choosing Model for Membrane Filtration
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4 жыл бұрынIn our course separation processes, we talk about three different models that we call the Osmotic Pressure Model, the Resistance in Series Model and the Concentration Polarisation model. Students often ask us when to use what model. In our compendium we have an overview that gives an approximate range (ranging from micro filtration to reverse osmosis) for each model, but what this video tries to explain is that
* all three models are simplifications
* all three models can be combined if needed
@rubenrai6672 3 жыл бұрын
Is there an example of how you solved iteratively in the end ?
@PLE_LU 3 жыл бұрын
No, but it's rather straightforward if you know some programming e.g. matlab, Fortran, Python or similar. Rearrange the euqation to form the residuals, e.g. write a function that use guesses of Cm and J and your values of ∆P etc to calculate residuals that should be zero, e.g. dPi= function of Cm … etc res(1)=J-(dP-dPi)/mu/Rm res(2)=J-k*log((Cm-Cb)/(Cb-Cp) and use standard routines for searching for zeros It's very similar to what's done (in matlab) in this video on evaporation (using different equations, but still, the principle is the same): kzfaq.info/get/bejne/ib-ohNuovtbcmIE.html Doing the iteration by hand is a pain
@user-bh7ps9jh9l Жыл бұрын
I will use comsol to simulate nanofilters, what is your advice?
@nelsoniruonagbe3256 4 жыл бұрын
what model would you advise I use for a flat sheet cellulose acetate membrane that is to adsorb dissolved CO2 in seawater?
@PLE_LU 4 жыл бұрын
Please do not make duplicate posts on the same channel
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