Saybolt viscosimeter

For most practical purposes, it will serve to know the relative viscosity of the fluid. Relative viscosity is determined by timing the flow of a given quantity of the hydraulic fluid through a standard orifice at a given temperature. There are several methods in use. The most acceptable method in the United States is the Saybolt viscosimeter. Figure 40.17. 

The viscosities of suspensions of UO3 H2O rods and platelets with uranium concentrations of up to 250 g/liter were measured [87] with a modified Saybolt viscosimeter at temperatures from 30 to 75 C. There was no detectable difference in viscosity between the slurries of rods and those of platelets at these uranium concentrations. The viscosity values given in... 

See also Saybolt Universal Viscosity and Viscometer (or Viscosimeter). 

Saybolt Second Universal or Saybolt Universal Second viscosity measure. The time (in seconds) for 60 ml of fluid to flow through a Saybolt Universal Viscosimeter at 40°C to 100°C. Crankcase or oil reservoir of an internal combustion engine. Boundary between two phases. The term surface and interface are often used interchangeably. 

Saybolt universal viscosity, measured by the number of seconds required for a sample to pass through a standard orifice In a Say bolt viscosimeter, usually specified at 100°F. 

Kinematic viscosity may be determined directly by means of Ubbelohde, FitzSimmons modification, or modified Ostwald viscosimeter pipettes (D445). A series of these pipettes which cover the entire useful range of viscosity may be suspended in a single constant-temperature bath. Great accuracy is possible with these instruments, and a somewhat smaller sample is satisfactory, but each instrument must be calibrated. The pipette method must be used for gasoline, naphthas, or kerosene, because turbulent rather than streamline flow occurs in the large orifices of the Saybolt equipment. The viscosity of kerosene is sometimes determined in the Saybolt thermoviscosimeter, and thermoviscosity (at 60 F) is related to the kinematic and Saybolt Universal viscosity (at 60 F) approximately as follows ... 

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