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Simulating Capillary Effect in a heat pipe wick

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Old   February 26, 2019, 06:09
Default Simulating Capillary Effect in a heat pipe wick
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Rahul Ruia
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I am doing my 8th semester project on heat pipes.
My project mainly involves simulations on ANSYS.
I have successfully modelled and meshed ( which is the easier part), I am struggling to incorporate the capillary effect in my wick structure.

The heat pipe which I have modelled is a closed system, it contains a vapour flow region enclosed by a wick structure.
The wick structure is in turn enclosed by a copper casing.

I am using the VOF model into incorporate the multiphase effects, along with the K-Epsilon model .
The main problem I am facing is on how to incorporate the capillary effect.
I am currently running a simulation with the following settings in the porous zone :-

1) Homogenous Porosity of 0.55
2) I am using only viscous resistance as the flow in the porous region is laminar.
I have 3 fluids namely air, water and steam.
I have given the same values of viscous resistance for water and steam and higher value for air ( I did this because I did not want air to flow in the porous media).
3) I reversed the direction vectors from 1 to -1 hoping that they will lead to incorporation of the capillary effect.

I am running short of time and am in need of help.


PS : please mail me at ruiarahul5@gmail.com ( for further information)
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Old   February 26, 2019, 08:06
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annan
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Dear Ruiarahul,
Have you fixed any value for the contact angle ?
Best regards,
Annan
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Old   February 27, 2019, 01:16
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Rahul Ruia
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Quote:
Originally Posted by annan View Post
Dear Ruiarahul,
Have you fixed any value for the contact angle ?
Best regards,
Annan
No Annan, i havent checked that out till now, i'll look into that.

Regards,
Rahul.
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Old   April 5, 2020, 05:43
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Wyj
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李正
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Quote:
Originally Posted by ruiarahul View Post
I am doing my 8th semester project on heat pipes.
My project mainly involves simulations on ANSYS.
I have successfully modelled and meshed ( which is the easier part), I am struggling to incorporate the capillary effect in my wick structure.

The heat pipe which I have modelled is a closed system, it contains a vapour flow region enclosed by a wick structure.
The wick structure is in turn enclosed by a copper casing.

I am using the VOF model into incorporate the multiphase effects, along with the K-Epsilon model .
The main problem I am facing is on how to incorporate the capillary effect.
I am currently running a simulation with the following settings in the porous zone :-

1) Homogenous Porosity of 0.55
2) I am using only viscous resistance as the flow in the porous region is laminar.
I have 3 fluids namely air, water and steam.
I have given the same values of viscous resistance for water and steam and higher value for air ( I did this because I did not want air to flow in the porous media).
3) I reversed the direction vectors from 1 to -1 hoping that they will lead to incorporation of the capillary effect.

I am running short of time and am in need of help.


PS : please mail me at ruiarahul5@gmail.com ( for further information)
Dear Ruiarahul,Did you solve the problem you raised?
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