30 replies to this topic

[astro]

Another very useful point of reference are the series of papers by Mark Bothamley:

https://www.markboth...com/?page_id=99

Quantifying Gas/Liquid Separation Performance, Parts 1, 2 and 3

 

Various inlet device type ρν² criteria are listed in Table 4 of Part 1 that are roughly similar to the data listed in GPSA as per comments above at:

https://www.cheresou...ation/?p=127311

[astro]

Greetings everyone. Can anyone explain to me the physical significance of "Density x Velocity^2" term? What does it actually mean and what is it called? Few places it is referred as momentum flux, is there any other term for it? Thank you for your time. 

 

 

Afaruque,

On youtube, search for Momentum flux equation with application.

This tutorial should help you.

Breizh  

Excellent tip Breizh - I find the loose use of "momentum" confusing because I can't help apply undergrad dimensional analysis and the term simply doesn't stack up when I apply basic arithmetic.

 

"Momentum flux" makes dimensional sense and is consistent with the theory you point to (the tutorial from Djordje Romanic was a handy refresher).

 

GPSA uses "velocity head" for momentum flux that is also equivalent to "dynamic pressure", as noted by Bothamley.

[Anastasia1905]

Hi everyone!

 

I am currently calculating the maximum capacity of the separation equipment and the following problem has arisen: my calculation of the outlet liquid velocity is higher than the vendor calculated. 

I use the following formula: Vout = Act.Vol.Flow (m3/h)/3600/(Pi*Dnozzle^2/4).

 

Is my formula correct?

 

Thanks in advance!

[breizh]

Hi,

To me no question about the formula, V (m/s)= Qv(m3/s) / S (m2)  ,

Make sure you use the same volumetric flow which is coming from the mass balance , Qv = Mass liquid / Ro liquid ,Mass liquid =Total mass-Mass gas.

My 2 cents

Breizh

[latexman]

It looks right to me.  Volumetric flow/area = velocity.

[nguyen_uptorcem]

Hi everyone,

 

I’m working on a small revamp of our condensate degasser and would really value your advice on the inlet arrangement.

• Current setup: submerged inlet, no device; feed GVF ≈ 7%.

• With the new flow, the inlet momentum is about 2,900 Pa (ρv²), which is above the no-device limit in API 12J (~1,000 Pa).

• A vane-type inlet (Schoepentoeter) won’t work here because the inlet is submerged, and we can’t change the nozzle size or lower the liquid level (the nozzle is close to the bottom).

Could you kindly suggest submerged, low-shear solutions that would meet the API 12J momentum requirement?

 

Thanks so much for your guidance!