Heat and mass transfer in frozen porous media

    Research output: Thesisinternal PhD, WU

    Abstract

    <p><TT>In this thesis processes and parameters associated with heat and mass transfer in frozen porous media both on a theoretical and empirical basis are studied. To obtain the required measurements some existing measuring methods needed to be improved.</TT><p><TT>Firstly, an improved model has been developed for the measurement of thermal conductivity with use of the nonsteady-state probe method. The measurements of thermal conductivity indicate four separate effects caused by the freezing process.</TT><p><TT>The second improved measuring method is the measurement of bulk electrical conductivity with use of time-domain reflectometry.</TT><p><TT>And the third improvement is the use of the dispersion theory in the description of relations between water content and bulk electrical conductivity or dielectric constant.</TT><p><TT>This thesis shows that time-domain reflectometry can be used to measure the unfrozen water content and bulk electrical conductivity simultaneously under frozen conditions and that from the latter parameter solute redistribution can be monitored.</TT><p><TT>From the measured heat flows a time delay in the forming of pore ice can be concluded. From the measured moisture transport (resulting in frost heave) a relation with some soil properties could be established. For some of the materials studied a minimum temperature gradient has been observed at</TT>which<TT>heave starts. From this and other results an effort was made to come to a synthesis of the rigid ice concept and the segregation potential concept.</TT><p><TT>The thesis finishes with some recommandations in connection with the improvement of soil structure by freezing, frost heave and artificial ground freezing.</TT>
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    Supervisors/Advisors
    • Schenk, J., Promotor, External person
    • van Haneghem, I.A., Promotor, External person
    Award date25 Jun 1991
    Place of PublicationS.l.
    Publisher
    Publication statusPublished - 1991

    Keywords

    • vibration
    • acoustics
    • reflection
    • resonance
    • thermodynamics
    • heat
    • heat transfer
    • thermal conductivity
    • transmission
    • hydrodynamics
    • liquids
    • fluids
    • flow
    • porous media
    • frost
    • soil
    • vapour pressure
    • tensiometers
    • effects
    • temperature
    • cold
    • measurement
    • electrical properties

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