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Shear stress on liquid surface

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Old   June 13, 2007, 20:36
Default Shear stress on liquid surface
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akr
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Hi everyone.

I want to know the shear stress between the liquid (water) surface and air. Is this shear stress different from that between solid wall and air?

Thanks, akr
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Old   June 14, 2007, 06:11
Default Re: Shear stress on liquid surface
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K. Baker
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It is usually differ becuase at gas-liquid interface the relative velocity (vg-vw) was not the same as the gas velocity at the wall hence the shear stress not the same.

K. Baker

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Old   June 15, 2007, 00:39
Default Re: Shear stress on liquid surface
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akr
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Hi, Baker. Thank you for your reply.

Now I want to model gas flow in the chamber. This is my experimental apparatus. Acutually, in the apparatus, there is the liquid layer, approximately 30 mm in depth. So when I model the gas flow in this apparatus, I create a grid without the liquid layer. In the model, I set the boundary condition of the bottom face (this is acutually liquid surface) wall boundary and no-slip condition. So now I want to set a specified shear between interfaces of gas and liquid. Do you know what to do for? Is it O.K. to set the no-slip condition?

Thanks, akr
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Old   June 15, 2007, 01:18
Default Re: Shear stress on liquid surface
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K. Baker
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I think if you want to set interfacial shear you need to consider the wall as a moving wall and set its velocity equal to the highest velocity of liquid (Ui) I am not try this method in my calculation yet but I have a paper consider the interface as this so try it and see if it useful for you?

REGARDS Khalid Baker

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