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

Abstract

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
PublisherCOMSOL
Pages123-128
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

Conference

ConferenceNordic Comsol Conference 2006
CountryDenmark
CityCopenhagen
Period1/11/062/11/06

Fingerprint

air
thermal diffusion
free convection
planning
leakage
convection
helium
injection
conduction
fluids
coefficients
electronics

Keywords

  • portable device
  • air exchange
  • flow model
  • helium

Cite this

Gregersen, L., Olin, M., Laakso, L., Hannula, J., Galkin, T., Väkeväinen, K., & Hartikainen, K. (2006). Experimental and theoretical studies on air exchange of portable devices. In Proceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006 (pp. 123-128). COMSOL.
Gregersen, Lars ; Olin, Markus ; Laakso, Lauri ; Hannula, Jukka ; Galkin, Timo ; Väkeväinen, Kyösti ; Hartikainen, Kari. / Experimental and theoretical studies on air exchange of portable devices. Proceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006. COMSOL, 2006. pp. 123-128
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Gregersen, L, Olin, M, Laakso, L, Hannula, J, Galkin, T, Väkeväinen, K & Hartikainen, K 2006, Experimental and theoretical studies on air exchange of portable devices. in Proceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006. COMSOL, pp. 123-128, Nordic Comsol Conference 2006, Copenhagen, Denmark, 1/11/06.

Experimental and theoretical studies on air exchange of portable devices. / Gregersen, Lars; Olin, Markus; Laakso, Lauri; Hannula, Jukka; Galkin, Timo; Väkeväinen, Kyösti; Hartikainen, Kari.

Proceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006. COMSOL, 2006. p. 123-128.

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

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T1 - Experimental and theoretical studies on air exchange of portable devices

AU - Gregersen, Lars

AU - Olin, Markus

AU - Laakso, Lauri

AU - Hannula, Jukka

AU - Galkin, Timo

AU - Väkeväinen, Kyösti

AU - Hartikainen, Kari

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N2 - 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.

AB - 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.

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Gregersen L, Olin M, Laakso L, Hannula J, Galkin T, Väkeväinen K et al. Experimental and theoretical studies on air exchange of portable devices. In Proceedings of the Nordic Comsol Conference 2006 Copenhagen. November, 1-2, 2006. COMSOL. 2006. p. 123-128