Thermal flow permeametry - A rapid method for finding local changes in flow channels

Matti Järveläinen, Lassi Keskinen, Saara Heinonen, Aaretti Kaleva, Erkki Levänen

    Research output: Contribution to journalArticleScientificpeer-review


    Solid bodies with flow channels can have very heterogeneous structure, whose local variations are difficult to analyze. Yet, this can play an important role affecting characteristics, such as, fluid flow property, strength and heat conductivity. This article presents a method named thermal flow permeametry (TFP) that is applicable for a quick analysis of variations in flow channels, even in meter-sized structures. For illustrating the method, we analyzed the local permeability levels of a large and extremely complex fiber structure. In TFP, hot air is ejected through a structure, while thermal camera measures local surface temperature variations during heating. Gray values of the thermal image are then plotted versus the structures local thickness, density and permeability. We showed that gray values link with local permeability, affected by thickness, density and flow channel tortuousness. We also found out that TFP is very sensitive to local changes in flow channels.

    Original languageEnglish
    Pages (from-to)138-145
    Number of pages8
    JournalComposites Part A: Applied Science and Manufacturing
    Publication statusPublished - 1 Dec 2015
    Publication typeA1 Journal article-refereed


    • B. Anisotropy
    • B. Physical properties
    • B. Porosity
    • D. Non-destructive testing

    Publication forum classification

    • Publication forum level 2

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Mechanics of Materials

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