Request steps for aeration pattern study in steady water tank

Puni1993 · March 29, 2017, 10:50

Hi guys, can anyone help me in aeration pattern study in open water tank? The water is in steady state and the air is flowing from bottom to top of the tank. I can't find any tutorials for this. I tried many times in Ansys CFX but failed.

ghorrocks · March 29, 2017, 17:26

There is an example on the ANSYS customer webpage of exactly this. Look for "Chapter 18: Gas-Liquid Flow in an Airlift Reactor"

Puni1993 · March 29, 2017, 22:02

Thank you so much ghorrocks. I tried the steps stated in it. That one only one inlet. I have 24 diffusers define as one inlet. So i need to define the inlet velocity as 0.3 m/s (per diffusers) or I need to multiply the value by 24? At inlet, the volume fraction of air is one and water should be zero right?

ghorrocks · March 29, 2017, 23:24

You have to make sure you get the correct air flow rate on the boundary. So if you are defining it by inlet velocity then you have to make sure your modelled inlet area * inlet velocity is the correct air flow rate.

Puni1993 · March 30, 2017, 01:01

I have tried with mass flow rate. Amount air coming out of the inlets are not uniform. Why am I facing this problem? Is this because of meshing? At outlet the air flowing into the domain.

March 29, 2017, 10:50	Request steps for aeration pattern study in steady water tank	#1
Puni1993 New Member Puniyarasen Perumulselum Join Date: Nov 2016 Location: https://t.me/pump_upp Posts: 11 Rep Power: 9	Hi guys, can anyone help me in aeration pattern study in open water tank? The water is in steady state and the air is flowing from bottom to top of the tank. I can't find any tutorials for this. I tried many times in Ansys CFX but failed.

March 29, 2017, 17:26		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	There is an example on the ANSYS customer webpage of exactly this. Look for "Chapter 18: Gas-Liquid Flow in an Airlift Reactor" Puni1993 likes this.

March 30, 2017, 01:01		#5
Puni1993 New Member Puniyarasen Perumulselum Join Date: Nov 2016 Location: https://t.me/pump_upp Posts: 11 Rep Power: 9	I have tried with mass flow rate. Amount air coming out of the inlets are not uniform. Why am I facing this problem? Is this because of meshing? At outlet the air flowing into the domain. Last edited by Puni1993; March 30, 2017 at 04:08.

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March 29, 2017, 22:02		#3
Puni1993 New Member Puniyarasen Perumulselum Join Date: Nov 2016 Location: https://t.me/pump_upp Posts: 11 Rep Power: 9	Thank you so much ghorrocks. I tried the steps stated in it. That one only one inlet. I have 24 diffusers define as one inlet. So i need to define the inlet velocity as 0.3 m/s (per diffusers) or I need to multiply the value by 24? At inlet, the volume fraction of air is one and water should be zero right?

March 29, 2017, 23:24		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You have to make sure you get the correct air flow rate on the boundary. So if you are defining it by inlet velocity then you have to make sure your modelled inlet area * inlet velocity is the correct air flow rate.