<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>In the work, the effective thermal conductivity (ETC) of anisotropic composite material (well-conducting media with regular cavities of the air) is studied by numerical modelling. The authors examine the influence of orientation and size of the cavities on the ETC of material structure and the role of thermal conduction, convection and radiation in the heat transfer processes. For modelling, <italic>Keraterm</italic> type material was chosen. It has been proved numerically that the ETC of similar structures is lower in the case when the cavities are oriented perpendicularly to the heat flux direction as compared with parallel orientation. According to the analysis performed, the radiation heat exchange in such cavities dominates over the convective heat transfer in the observed temperature range. In the calculations of ETC in structures of the kind, convection inside the cavities can be omitted. The proposed approach allows optimisation of the arrangement and size of the cavities in similar building materials.</p></abstract>

In the work, the effective thermal conductivity (ETC) of anisotropic composite material (well-conducting media with regular cavities of the air) is studied by numerical modelling. The authors examine the influence of orientation and size of the cavities on the ETC of material structure and the role of thermal conduction, convection and radiation in the heat transfer processes. For modelling, Keraterm type material was chosen. It has been proved numerically that the ETC of similar structures is lower in the case when the cavities are oriented perpendicularly to the heat flux direction as compared with parallel orientation. According to the analysis performed, the radiation heat exchange in such cavities dominates over the convective heat transfer in the observed temperature range. In the calculations of ETC in structures of the kind, convection inside the cavities can be omitted. The proposed approach allows optimisation of the arrangement and size of the cavities in similar building materials.

Analysis of Heat Transfer in the Structures with Regularly Arranged Gas Cavities

Laboratory for Mathematical Modelling of Environmental and Technological Processes, University of Latvia, 8 Zeļļu Str, Rīga, LV-1002, LATVIA

Latvian Journal of Physics and Technical Sciences

{"article-title":"Analysis of Heat Transfer in the Structures with Regularly Arranged Gas Cavities"}

In the work, the effective thermal conductivity (ETC) of anisotropic composite material (well-conducting media with regular cavities of the air) is studied by...

Analysis of Heat Transfer in the Structures with Regularly Arranged Gas Cavities

Pubblicato online: 23 set 2008

Pagine: 14 - 24

DOI: https://doi.org/10.2478/v10047-008-0016-4

Parole chiave
effective thermal conductivity, heat conduction, convection and radiation

This content is open access.

Analysis of Heat Transfer in the Structures with Regularly Arranged Gas Cavities

Pubblicato online: 23 set 2008

Pagine: 14 - 24

DOI: https://doi.org/10.2478/v10047-008-0016-4

Parole chiaveeffective thermal conductivity, heat conduction, convection and radiation

This content is open access.

Parole chiave
effective thermal conductivity, heat conduction, convection and radiation