Experimental and theoretical studies on air exchange of portable devices

Lars Gregersen, Markus Olin, Lauri Laakso, Jukka Hannula, Timo Galkin, Kyösti Väkeväinen, Kari Hartikainen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Small electronic devices are nowadays used in varying conditions, which expose them to stresses, which should be recognized and take into account in the planning work. The exact structure of the devices of interest may be very complicated to be used in diffusion and fluid mechanical calculations. Therefore, we performed leakage analysis, fitted to approximate analytical diffusion and air-exchange models, by helium injection method for one mobile phone type. In order to extend the applicability of our models we developed a more complicated numerical model for diffusion, thermal conduction and free convection inside the phone. The application of numerical model led an estimated range of values of 3 - 10 1/h for air-exchange coefficients in case of operational mobile phone.
Original languageEnglish
Title of host publicationProceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006
ISBN (Print)87-989426-1-1
Publication statusPublished - 2006
MoE publication typeA4 Article in a conference publication
EventNordic Comsol Conference 2006 - Copenhagen, Denmark
Duration: 1 Nov 20062 Nov 2006


ConferenceNordic Comsol Conference 2006


  • portable device
  • air exchange
  • flow model
  • helium


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