THERMAL TRANSFER OF LIQUID IN POROUS MEDIA

THE TIME RATES OF THERMAL TRANSFER OF WATER, ETHANOL, BENZENE, CARBON TETRACHLORIDE AND DIBUTYL PHTHALATE WERE MEASURED AT EARLY STAGES OF EXPERIMENTS WITH CLOSED COLUMNS OF TWO UNSATURATED POROUS CERAMICS-CRUSHED CERAMSITE AND CRUSHED FIREBRICK. THE MEASURED FLUXES WERE SHOWN TO BE HIGHER THAN THE CALCULATED VAPOR DIFFUSION FLUXES IN ALL CASES EXCEPT DIBUTYL PHTHALATE, WHOSE THERMAL TRANSFER WAS NOT DETECTED. THE DIFFERENCES BETWEEN THESE VALUES DO NOT FOLLOW THE SEQUENCE OF THERMO-CAPILLARY FILM FLUXES WHICH CAN BE INDUCED BY SURFACE TENSION GRADIENTS ALONG THE AIR-LIQUID INTERFACE. THUS THERMO-CAPILLARY FILM FLOW DOES NOT PLAY AN ESSENTIAL ROLE IN THERMAL MASS TRANSFER UNDER THE CONDITIONS INVESTIGATED. THE ANALYSIS OF THE TWO OTHER POSSIBLE MECHANISMS OF THERMAL LIQUID TRANSFER (THERMO-SELF-DIFFUSION AND THERMO-OSMOSIS IN A SINGLE CAPILLARY FILLED WITH ONE-COMPONENT POLAR LIQUID) WAS ACCOMPLISHED ON THE BASIS OF IRREVERSIBLE THERMODYNAMICS AND KINETIC THEORY OF LIQUIDS. THIS ANALYSIS RESULTED IN THE EXPRESSION FOR THE STEADY PRESSURE DIFFERENCE BETWEEN THE ENDS OF A NON-ISOTHERMAL CAPILLARY. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 39-50
  • Monograph Title: Effects of temperatures and heat on engineering behavior of soils
  • Serial:

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Filing Info

  • Accession Number: 00237754
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Aug 25 1994 12:00AM