5 replies to this topic

[SPCon]

Hello,

 

I am in the process of designing an air sparge for a vessel. I have been trying to follow the method in Perry's. From what I have managed to piece together the Coefficient of discharge (C_d) is key to the calculations. 

 

In the example in the book a value of 0.62 is used, but it is not stated where it came from. After further research I have found that it is possible to calculate a value for C_d, but to do this I would need to already know data such as the pressure drop though the hole and the hole area. But as these are values I am already trying to calculate i'm struggling to calculate the C_d.  So i'm wondering the C_d is defined within industry norms or something simlar.

 

Is anyone able to confirm if this is the case? or does anyone know what I'm missing?

 

thanks in advance

[Pilesar]

Review the topic previously covered in this forum at https://www.cheresou...stributor-pipe/

The Knaebel reference has been particularly useful to me.

 

The Cd is an experimental value for different discharge configurations and usually grabbed from a table for calcs as 'good enough'.

[Bobby Strain]

You should consider buying from a company who manufacturers sparge mixers. You won't get very effective mixing with only holes in a pipe.

 

Bobby

[breizh]

Hi,

Consider the docs attached to support your work.

In some papers I found  a Cd value of 0.61 to 0.62 .

Breizh

[latexman]

The Cd is an experimental value for different discharge configurations and usually grabbed from a table for calcs as 'good enough'.

 

SPCon,

 

There are some "tables" here.  I suspect the orifice discharge coefficients are closest to what you are doing.  Google "list of discharge coefficients".  It will be helpful to you.

[SPCon]

thanks for the help all. I think I have enough information to proceed.