Very informative videos, many thanks for taking the time to upload these. 1 question: this question uses vvm as 1, in the case vvm isn’t 1 what would be the volumetric flow of air? Is the calculation: Volume of liquid/vvm -> ans/60
vvm stands for volume of gas sparged per unit volume of liquid - it is usually around 1. If it is 1.2, it means you have to calculate the volume of the liquid in the reactor first and then multiply this by 1.2 to get volume of gas per min. You then divide this to get volume of gas / s (Q).
@@MarloesPeeters Thank you! I hope you continue to make these types of videos I’m a student elsewhere and these have helped significantly in the design of my reactor.
Very informative video! May I ask what reference did you use on the formulas for Kla? I've been looking for similar equations but i can't seem to find one. Thank you in advance! ^^
On the first slide, you can see that kLa is a function of Pg/V and vs (formula is almost at the bottom of the page). This is an empirical formula for kLa that is commonly used.
Can someone help me understand: Pg = Watt = m^2*kg/sec^3. When divided by the volume you're left with kg/sec^3*m. How does Pg/V * Vs give you 1/sec as units?
You can read more about it here: www.sciencedirect.com/science/article/abs/pii/S0168165613003830. This is an adaptation of the Van 't Riet equation but there is also a form of it that is dimensionally tight (Henzler, 2007, see link)
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Thank you for real, this explanation helped me understand the exercise very well, thank you!!! :)))
Great to hear!
Very informative videos, many thanks for taking the time to upload these. 1 question: this question uses vvm as 1, in the case vvm isn’t 1 what would be the volumetric flow of air?
Is the calculation:
Volume of liquid/vvm -> ans/60
vvm stands for volume of gas sparged per unit volume of liquid - it is usually around 1. If it is 1.2, it means you have to calculate the volume of the liquid in the reactor first and then multiply this by 1.2 to get volume of gas per min. You then divide this to get volume of gas / s (Q).
@@MarloesPeeters Thank you! I hope you continue to make these types of videos I’m a student elsewhere and these have helped significantly in the design of my reactor.
You state 3.88m3 for your volume - if it’s 3.88L then that’s divided by 1000 to get into m3
@@sau01drs It is 3.88 m3, not sure why it needs to be converted into L for this purpose?
@@MarloesPeeters I mentioned it because 3.88L is 0.00388m3, not 3.88m3
Very informative video! May I ask what reference did you use on the formulas for Kla? I've been looking for similar equations but i can't seem to find one. Thank you in advance! ^^
Have a look at Bioreactors.net -- search kLa. I can also send an article with more info.
@@MarloesPeeterscan you also share an article with me please?
Which article do you mean?@@bijaykumar1
How did you get the kLa from the superficial gas velocity?
On the first slide, you can see that kLa is a function of Pg/V and vs (formula is almost at the bottom of the page). This is an empirical formula for kLa that is commonly used.
Can someone help me understand: Pg = Watt = m^2*kg/sec^3. When divided by the volume you're left with kg/sec^3*m. How does Pg/V * Vs give you 1/sec as units?
You can read more about it here: www.sciencedirect.com/science/article/abs/pii/S0168165613003830. This is an adaptation of the Van 't Riet equation but there is also a form of it that is dimensionally tight (Henzler, 2007, see link)
@@MarloesPeeters thank you.