# question about simulation of falling water film

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 September 27, 2009, 00:41 question about simulation of falling water film #1 New Member   mengyue Join Date: Sep 2009 Posts: 17 Rep Power: 9 Hello all, I am studying evaporative cooling of a falling water film along a heated wall in the presence of counter-current air flow. The system is a rectangle channel with one sidewall heated and water falling along the heated wall, forming a water film, meanwhile, air is blowed to the channel at the bottom. My initial thoughts are: Firstly create a rectangle channel and then create a face inside the channel, split the channel to two volumes with the face: one is channel for water flow and the other for air low; correspondingly, the top face is separated into two parts: one is the inlet of water and another is the outlet of air; the bottom face is similar to the top face, one is the outlet of water and the other is the inlet of air. I define the face used to separate the channel as interface. And I plan to use VOF model. Is that correct? I mean, in fact, I do not know the depth of the falling film, I just know the mass flow rate of water and the inlet velocity of air, so I do not know where I can define the interface, and it is said that VOF can automatically find the interface, so that means my definition of interface is meaningless?Wow, I am so puzzled as a freshman using Fluent, any one has some useful suggestions for my question? Regards, mengyue1

September 27, 2009, 06:13
#2
New Member

mengyue
Join Date: Sep 2009
Posts: 17
Rep Power: 9
hi, anyone can give some adivce? Thank you...
Quote:
 Originally Posted by mengyue1 Hello all, I am studying evaporative cooling of a falling water film along a heated wall in the presence of counter-current air flow. The system is a rectangle channel with one sidewall heated and water falling along the heated wall, forming a water film, meanwhile, air is blowed to the channel at the bottom. My initial thoughts are: Firstly create a rectangle channel and then create a face inside the channel, split the channel to two volumes with the face: one is channel for water flow and the other for air low; correspondingly, the top face is separated into two parts: one is the inlet of water and another is the outlet of air; the bottom face is similar to the top face, one is the outlet of water and the other is the inlet of air. I define the face used to separate the channel as interface. And I plan to use VOF model. Is that correct? I mean, in fact, I do not know the depth of the falling film, I just know the mass flow rate of water and the inlet velocity of air, so I do not know where I can define the interface, and it is said that VOF can automatically find the interface, so that means my definition of interface is meaningless? Wow, I am so puzzled as a freshman using Fluent, any one has some useful suggestions for my question? Regards, mengyue1

 March 30, 2014, 10:16 #3 New Member   Bora Join Date: Dec 2010 Posts: 8 Rep Power: 7 Hi Mengyue1, I have the same kind of questions, I am trying to model free falling water in air. Did you find answers for your question?

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