MISCONCEPTIONS IN THE USE OF SURFACE TENSION IN CAPILLARITY

SOME BASIC CONCEPTS OF CAPILLARITY ARE PRESENTED. PHENOMENA OF SOLID-LIQUID SYSTEMS ARE REVIEWED IN ORDER TO RECAPITULATE RELATIONSHIPS INVOLVED IN COHESION, ADSORPTION, CONTACT ANGLES, AND CAPILLARY RISE. THE ACCEPTANCE IN SOIL MECHANICS THEORY OF "SURFACE TENSION" AS A PHYSICAL REALITY RATHER THAN A CONVENIENT ANALOGY IS REJECTED. THE ATTEMPT IS MADE TO SUPPLY A MECHANISM FOR DESCRIBING EQUILIBRIUM IN SOIL-WATER SYSTEMS WHICH AVOIDS THE INCONSISTENCIES ARISING FROM SURFACE TENSION, UPON WHICH ARE POSTULATED TENSILE STRENGTH IN WATER, APPARENT COHESION, AND RELATIONS INVOLVING PORE PRESSURE, HYDRODYNAMIC EXCESS, AND EFFECTIVE SHEARING STRESS AS INHERENT PROPERTIES DISTINGUISHED FROM THE TOTAL FORCES OF RESISTANCE NECESSARY FOR STATE EQUILIBRIUM. ANY MATERIAL IN EQULIBRIUM INVOLVES MOLECULAR ATRTRACTION IN COMBINATION WITH EQUAL AND OPPOSING FORCES OF MOLECULAR REPULSION. DIFFICULTIES ARISING FROM THE ATTEMPTS TO DESCRIBE CONDITIONS OF EQUILIBRIUM IN TERMS OF ONE OR THE OTHER FORCE SYSTEM SEPARATELY AS AN INHERENT PROPERTY ARE DISCUSSED. CAPILLARY RISE IS DESCRIBED AS THE RESULT OF INTERNAL PRESSURE IN THE LIQUID IN COMBINATION WITH MOLECULAR ATTRACTION. EXPERIMENTAL DATA FROM LABORATORY EXPERIMENTS EXTENDING OVER SEVERAL YEARS ARE PRESENTED TO CLARIFY AND DEMONSTRATE THE MECHANISM OFFERED TO DESCRIBE CAPILLARY RISE. /AUTHOR/

  • Supplemental Notes:
    • Vol 30, pp 465-489, 8 FIG, 2 TAB, 1 APP
  • Authors:
    • Housel, W S
    • Holdhusen, J S
  • Discussers:
    • Gray, H
  • Publication Date: 1951

Media Info

  • Monograph Title: Proceedings of the Thirtieth Annual Meeting of the Highway Research Board Held at Washington, D.C., January 9-12, 1951
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00235984
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 25 1971 12:00AM