ISSN:
1420-9136
Keywords:
Key words: Capillarity, Wood's metal, surface tension, wettability, porosity.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract —A tensiometric method (Wilhelmy plate) is used to study Wood’s metal dynamic wettability on specially prepared surfaces of quartz single crystals at low velocities of immersion (2 to 16 μm/s). After correction for buoyancy, the force exerted on the plate by the molten metal is used to derive the unit work of wetting γ cos θ where γ is the Wood’s metal surface tension and θ is the interfacial contact angle. Tests at different temperatures (85, 120 and 200°C) show that below 120°C, viscosity effects cannot be neglected. At an immersion/emersion rate of 2 μm/s, γ cos θ is in the range 0.417–0.444 N/m at 120°C, and 0.432–0.458 N/m at 200°C. These figures allow the conversion of injection pressures into capillary diameters during Wood’s metal injection tests. The method is promising since it may be used in porous materials to check the sensitivity of the unit work of wetting γ cos θ to parameters such as roughness and mineralogy, which are known to vary in a wide range within the pores and cracks of rocks.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s000240050257
