ELECTRO-OSMOTIC EFFECTS IN A BENTONITE-WATER SYSTEM

MEASUREMENTS OF THE ELECTRO-OSMOTIC VELOCITY, STREAMING POTENTIAL AND HYDRAULIC CONDUCTIVITY FOR A BENTONITE-WATER SYSTEM HAVE BEEN REPORTED IN THIS PAPER. IT HAS BEEN SHOWN THAT WHILE THE FLOW OF ELECTRICITY IN THE PRESENCE OF BOTH HYDRAULIC PRESSURE AND ELECTRICAL POTENTIAL DIFFERENCE IS GIVEN BY THE USUAL LINEAR PHENOMENOLOGICAL EQUATION, THE FLOW OF WATER IN THE PRESENCE OF BOTH HYDRAULIC PRESSURE AND ELECTRICAL POTENTIAL DIFFERENCE IS GIVEN BY A NON-LINEAR EXPONENTIAL TYPE OF RELATIONSHIP. IT HAS BEEN CONFIRMED THAT THE RELATIONSHIP BETWEEN WATER FLUX AND HYDRAULIC PRESSURE IN ABSENCE OF ELECTRICAL POTENTIAL DIFFERENCE IS ADEQUATELY REPRESENTED BY SWARTZENDRUBER'S EQUATION. AN OBSERVATION THAT HAS BEEN MADE IN THE PRESENT SYSTEM IS THAT UNLESS THE APPLIED POTENTIAL DIFFERENCE EXCEEDS A CERTAIN THRESHOLD VALUE, THE FLOW OF WATER DUE TO ELECTRO-OSMOSIS DOES NOT TAKE PLACE. THE PLOT OF ELECTRO- OSMOTIC VELOCITY AGAINST APPLIED POTENTIAL DIFFERENCE, THOUGH LINEAR, DOES NOT PASS THROUGH THE ORIGIN AND HAS A DEFINITE INTERCEPT ON THE ELECTRICAL POTENTIAL DIFFERENCE AXIS. PHENOMENOLOGICAL EQUATIONS FOR THE SIMULTANEOUS TRANSPORT OF WATER, DEVELOPED FROM ANALYSIS OF THE DATA, IS PRESENTED. IT HAS BEEN REVEALED THAT THE COUNTER EFFECT OF STREAMING POTENTIAL CAN NOT ACCOUNT FOR THE NON-DARCIAN BEHAVIOR, I.E., THE NON-PROPORTIONAL FLOW OF WATER THROUGH BENTONITE CLAY.

  • Authors:
    • Srivastava, R C
    • Avasthi, P K
  • Publication Date: 1973-9

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  • Accession Number: 00238178
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1974 12:00AM