摘要:

The viscosity of aeolotropic liquids between two plates has been found to increase when an electric field, steady or alternating, is applied perpendicularly to the plates; this effect is probably due to real or apparent orientation of the axis of the swarms parallel to the electric field. A change of electrical conductivity under shearing stress has also been found. Ordinary isotropic insulating liquids show some apparent decrease in viscosity with a steady field, but this is probably due to electrolysis.

ISSN:0021-8979    

DOI:10.1063/1.1745328

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

A formal solution is given for the motion of a highly viscous fluid when a symmetrical pressure is applied at the surface. This is applied to the subsidence of a cylindrical body of constant thickness and to the recovery of the fluid after removal of a load. Applying the latter case to the plastic recoil of the earth after the disappearance of the Pleistocene ice sheets, it is found that the geological data imply a kinematic viscosity of the order of 3×1021c.g.s. units.

ISSN:0021-8979    

DOI:10.1063/1.1745329

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

The viscosity‐volume data of Kleinschmidt and Dow have been examined at various pressures and temperatures for lard, sperm and Pennsylvania medium oil. The viscosity‐volume isotherms at 25°, 40° and 75°C are not identical for any of the oils studied, indicating that viscosity cannot be a function of the specific volume alone. The viscosity‐volume curve for lard oil at 25° departs from the one at 75° by an amount sufficient to change the viscosity by a factor of 2.3 at a volume of 0.99, and by a factor of 3.2 at a volume of 0.93. Similar curves for Pennsylvania medium oil at the same temperatures are even more relatively displaced; the discrepancy in viscosity varies from a factor of 3.8 at a volume of 0.99 to 7.6 at 0.94. The three oils do not obey Batschinski's equation at atmospheric and higher pressures up to 4000 kg/cm2.

ISSN:0021-8979    

DOI:10.1063/1.1745330

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

Since in a colloidal or quasi‐plastic material, the viscosity is a function of the rate of shear, it seems best to determine the velocity‐gradient across a section perpendicular to the direction of flow under shearing forces, and to determine the coefficient of viscosity under a given velocity gradient. An account is given of the experimental methods at present available for this purpose, and a method indicated by which the viscosity may be calculated from such measurements. The viscometers described comprise instruments based on the optical, electromagnetic, hot‐wire and colorband principles, respectively.

ISSN:0021-8979    

DOI:10.1063/1.1745331

出版商:AIP    

年代:1935

数据来源: AIP