Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Water condensation on cold surfaces

Please login with a confirmed email address before reporting spam

Hi I am simulating heat and mass transfer with comsol in a closed chamber in order to detect condensation on walls surfaces. At some point I have obtained the water concentration profil as well as the temperature distribution, which I can use to determine the relative humidity. I calculated the relative humidity as the (water vapor pressure/water vapor saturation pressure). Using this concept I have found values of relative humidity that exceeds 100% which is not real since at that value the water vapor starts to condensate. My question is how to limit relative humidity to 100% and determine the quantity of condensed water. Does anyone have any clue how to do this with comsol ?


1 Reply Last Post 3 ott 2017, 09:35 GMT-4
Sergei Yushanov Certified Consultant

Please login with a confirmed email address before reporting spam

Posted: 7 years ago 3 ott 2017, 09:35 GMT-4

Ahmed,

Comsol has special "Moist Air" feature which includes physical properties of dry air and water vapor mixture, as well as built-in functions for temperature-dependent saturation pressure and latent heat of evaporation. This feature also has predefined variable for relative humidity. This simplifies modeling of the water condensation and you might consider to take a look at the following examples:

https://www.comsol.com/model/condensation-detection-in-an-electronic-device-with-transport-and-diffusion-14397

https://www.comsol.com/model/condensation-risk-in-a-wood-frame-wall-43871

Regards,

Sergei

Ahmed, Comsol has special "Moist Air" feature which includes physical properties of dry air and water vapor mixture, as well as built-in functions for temperature-dependent saturation pressure and latent heat of evaporation. This feature also has predefined variable for relative humidity. This simplifies modeling of the water condensation and you might consider to take a look at the following examples: https://www.comsol.com/model/condensation-detection-in-an-electronic-device-with-transport-and-diffusion-14397 https://www.comsol.com/model/condensation-risk-in-a-wood-frame-wall-43871 Regards, Sergei

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.