Volume 4, Issue 11, 01 November 1933
Index of content:
4(1933); http://dx.doi.org/10.1063/1.1745149View Description Hide Description
This part contains fluidity data for about 346 liquids to be used for reference. They are arranged as fluidities at particular temperatures. Temperatures at particular fluidities were also obtained and from the latter tables, associations were calculated. The factors affecting association are briefly discussed which leads us to a tentative classification of associating and protecting groups. Finally the distinction between association, polymerization and condensation and polymerization is discussed.
4(1933); http://dx.doi.org/10.1063/1.1745150View Description Hide Description
Viscosity measurements at low temperatures show that after a temperature change an oil may require several weeks to attain an equilibrium state. Oils which show this viscosity anomaly are not truly viscous. The existence of a starting pressure called the yield value was not confirmed by experiment since the oil flows even under very slight pressure.
4(1933); http://dx.doi.org/10.1063/1.1745151View Description Hide Description
The wall effect for balls falling in a vertical cylindrical tube in a viscous fluid has been studied and expressed as an empirical function of the ratio of radii of the ball and tube. This function agrees well with observations at least to a ratio of 0.83 as compared with 0.09, the limit of agreement of Ladenburg's formula. The wall effect is probably independent of the absolute radii of the ball and tube and only slightly dependent upon the absolute viscosity. The bottom effect is negligible. For liquids of high viscosity the revised formula is
4(1933); http://dx.doi.org/10.1063/1.1745152View Description Hide Description