Condensation of vapour in a closed volum

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  • Last Post 25 September 2019
giovanni_ianziti posted this 31 May 2019

Hello everyone, I'm working on a heat pipe in a planar case. I have water and vapour inside the tube. After the boiling of the water, the vapour goes up and exchange heat in the condenser but after a lot of seconds, in my simulation, I can't see the condensation of the vapour near the wall (in volume fraction contours). Can i have same help? What do you think?  I show you my thermal conditions.

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abenhadj posted this 31 May 2019

Please insert screenshot as from ANSYS Stuff we do not download any attachments.

Which models  have been used? Add some more details about boundary and geometry.

Best regards, Amine

giovanni_ianziti posted this 31 May 2019

Sorry. I'm using VOF with evaporation-condensation abilited, on ansys 19.2

thermal conditions in the evaporator: heat flux 12512 W/m^2

thermal conditions in the condenser : convection 707.6 W/m^2 K , free stream temp 301.4 K

abenhadj posted this 03 June 2019

Are the wall temperature and cell adjacent temperature lower than the dew temperature in the condenser section?

Best regards, Amine

17611658877 posted this 15 September 2019

Sorry. I'm using VOF with evaporation-condensation abilited, on ansys 19.2

thermal conditions in the evaporator: heat flux 12512 W/m^2

thermal conditions in the condenser : convection 707.6 W/m^2 K , free stream temp 301.4 K

 

Hello, is your final simulation result consistent with the reference article?

 

rwoolhou posted this 25 September 2019

Is the gas phase compressible?  If you do a mass integral over the volume do you still have about the same water & water-vapour mass as at the start? 

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