Modeling Fluid Drop in CFX

taywrex · November 6, 2013, 00:40

Hello!

First time post so go easy on me. Kidding, I hope to one day become a valuable contributor so any constructive criticism is welcome.

So here's some brief background: I am a new CFX user with a decent amount of fluid mechanics education (currently a junior studying mechanical engineering). I have completed many of the CFX tutorials and done some basic practice problems. My solid modeling skills are very refined, but the pre processing and boundary conditions aspects still slow me down.

Here's the problem: I am attempting to model the fluid flow through capillary channels. The fluid is introduced as a single fluid droplet of a given size (based on research that I am completing), pulled through the capillary channels, and evaporated into a superheated vapor by the end. I guess I need to know a few things:

1. Is CFX the appropriate software package to complete such a task, namely modeling a single droplet being introduced into a system, dispersing into a set of channels, and being pulled through and evaporated?

2. If so, could anyone point me in the direction of any resources that would help me complete this?

Any help that you all can offer is much appreciated. This research is focused on capillary enhanced heat transfer. Again, I hope that as I refine my CFX skills that I can be of help to you all in the near future. Thank you very much.

Taylor

ghorrocks · November 6, 2013, 07:08

Yes, CFX can do this. But do not underestimate the difficulty of what sounds like a free surface model in a capilliary structure with phase change. The free surface in a capilliary model or the evaporation model by itself is enough complexity for most people, but you are trying to do both together. I hope you have plenty of time to develop this model.

For free surface modelling for a flow with strong surface tension effects (which I suspect this is) I think you will find Fluent a far better package. Its transient free surface models are orders of magnitude faster than CFX.

To develop a model as you describe you need a strong understanding of free surface flows in the micro scale and phase change. You will need to read the literature to get this, and the ANSYS training courses are very useful as well.

November 6, 2013, 00:40	Modeling Fluid Drop in CFX	#1
taywrex New Member Taylor Kunke Join Date: Nov 2013 Location: Washington Posts: 1 Rep Power: 0	Hello! First time post so go easy on me. Kidding, I hope to one day become a valuable contributor so any constructive criticism is welcome. So here's some brief background: I am a new CFX user with a decent amount of fluid mechanics education (currently a junior studying mechanical engineering). I have completed many of the CFX tutorials and done some basic practice problems. My solid modeling skills are very refined, but the pre processing and boundary conditions aspects still slow me down. Here's the problem: I am attempting to model the fluid flow through capillary channels. The fluid is introduced as a single fluid droplet of a given size (based on research that I am completing), pulled through the capillary channels, and evaporated into a superheated vapor by the end. I guess I need to know a few things: 1. Is CFX the appropriate software package to complete such a task, namely modeling a single droplet being introduced into a system, dispersing into a set of channels, and being pulled through and evaporated? 2. If so, could anyone point me in the direction of any resources that would help me complete this? Any help that you all can offer is much appreciated. This research is focused on capillary enhanced heat transfer. Again, I hope that as I refine my CFX skills that I can be of help to you all in the near future. Thank you very much. Taylor

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November 6, 2013, 07:08		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Yes, CFX can do this. But do not underestimate the difficulty of what sounds like a free surface model in a capilliary structure with phase change. The free surface in a capilliary model or the evaporation model by itself is enough complexity for most people, but you are trying to do both together. I hope you have plenty of time to develop this model. For free surface modelling for a flow with strong surface tension effects (which I suspect this is) I think you will find Fluent a far better package. Its transient free surface models are orders of magnitude faster than CFX. To develop a model as you describe you need a strong understanding of free surface flows in the micro scale and phase change. You will need to read the literature to get this, and the ANSYS training courses are very useful as well.