CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

droplet separation off a particle in turbulent stream

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   August 22, 2013, 14:40
Default droplet separation off a particle in turbulent stream
New Member
Pratik Pednekar
Join Date: Aug 2013
Posts: 1
Rep Power: 0
anonymous_89 is on a distinguished road

I am looking to develop the following system in a different platform, but I could use a little help from anyone with a CFD background and good understanding of particulate flow. I would very much appreciate the help in making sense of this.

The following is the system I am looking at.

A droplet resides on a particle. The size of the particle is 100 microns and the droplet is around 1-10 microns. The system is in a plug flow reactor with low slip velocity ( U_particle - U_gas is not very high). The Reynolds number of the gas in the reactor is very high (10^5) (calculated using gas velocity and diameter of the reactor) while the particle Reynolds number is very low (10^-2) (calculated using slip velocity and diameter of particle).

I would like to know the shear rate on the particle, so as to see whether the gas flow can separate the droplet sitting on it by overcoming the adhesion force (droplet contact angle is very high). (Drag force on the droplet is not sufficient alone)

My question is, would it be correct, due to the smaller slip velocity and small Particle Reynolds number, to model the flow around the particle as stokes flow? Can i make any assumptions to simplify this problem in the Navier Stokes eqn.

If I know the boundary layer thickness over the particle, i could calculate the shear rate on the particle. how can i go about this?


anonymous_89 is offline   Reply With Quote


lift force on particle, particulate flow, shear rate on sphere, turbulent stream

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Use of k-epsilon and k-omega Models Jade M Main CFD Forum 39 March 19, 2020 19:27
cyclones and particle separation MachZero Main CFD Forum 0 July 7, 2013 23:20
Airfoil turbulent separation Seroga Main CFD Forum 0 October 23, 2008 03:02
Separation phenomenon of water, droplet and air Raymond CFX 0 July 9, 2004 23:59
separation and stream function co2 FLUENT 0 December 27, 2003 19:18

All times are GMT -4. The time now is 13:04.