SOME FRICTIONAL PROPERTIES OF THIN WATER FILMS.
SNOW ICE AND PERMAFROST RESEARCH ESTABLISHMENT WILMETTE ILL
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An optical method has been established to measure film thickness down to about 0.2 micron and a shear apparatus has been constructed for the investigation of frictional properties of water films sandwiched between optically flat glass plates. Friction has been studied as a function of film thickness, rate of shearing and temperature. It rises very rapidly from very low values to high values when the film becomes 1 micron or thinner. The stress is inversely proportional to the film thickness and only slightly dependent on rate of shear, decreasing with increasing shear. The phenomenon is clearly that of dry friction due to particulate matter and some remaining asperities in the glass surface. Author
- Physical Chemistry
- Fluid Mechanics