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Bubble Column Understanding

gas velocity; bubble rise velocity; bubble column reactor fluid dynamics superficial velocity

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#1 antogam

antogam

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Posted 04 November 2020 - 05:32 AM

Dear all,
I'm studying the fluid dynamics of bubble column reactors.
 
I have trouble understanding the difference between:
 
superficial gas velocity of the gas (gas flow rate / cross-sectional area) and bubblerise velocity (I found this through the correlation between Reynolds number and drag coefficients).
 
I don't understand what value to insert in the correlations for the calculation of the mass transfer coefficients.
 
furthermore, are there any correlations between these velocities?
 
 
 
Thanks in advance

 

 



#2 PingPong

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Posted 04 November 2020 - 01:14 PM

superficial gas velocity of the gas (gas flow rate / cross-sectional area)

Or in other words: superficial gas velocity is the gas velocity if the column would be empty.

 

bubble rise velocity

That is the velocity with which gas bubbles rise upward through a liquid. Apart from gas and liquid properties that also depends on the bubble size: smaller bubbles rise slower than big bubbles.

 

I don't understand what value to insert in the correlations for the calculation of the mass transfer coefficients.

Normally some text explains which variables to insert in a correlation, and in which units of measurement.

So read all text surrounding the correlation carefully.

 

are there any correlations between these velocities?

No.


Edited by PingPong, 04 November 2020 - 01:16 PM.





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