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1) "Viscosimeter" -- As to viscosimeter vis·co·sim·e·ter
Pronunciation: "vis-k&-'si-m&-t&r
Function: noun
Etymology: International Scientific Vocabulary viscosity + -meter
: VISCOMETER
- vis·cosi·met·ric /(")vis-"kä-s&-'me-trik/ adjective Pronunciation Symbols
A viscometer (also called viscosimeter) is an instrument used to measure the viscosity and flow parameters of a fluid. The classical method of measuring due to Stokes, consisted of measuring the time for a fluid to flow through a capillary tube. Refined by Cannon, Ubbelohde and others, the glass tube viscometer is still the master method for the standard determination of the viscosity of water. The viscosity of water is 0.890 mPa·s at 25 degrees Celsius, and 1.002 mPa·s at 20 degrees Celsius. Glass tube viscometers can have a reproducibility of 0.1% under ideal conditions, which means immersed in a fluid bath, but are not ideally suited for measuring fluids with high solids contents, or viscosity. Further, they are impossible to use to accurately characterise non-newtonian fluids, which the majority of fluids of interest tend to be. There are international standard methods for making measurements with a capillary instrument, such as ASTM D445. - 1 Rotation Viscometers
- 2 Miscellaneous viscometer types
- 3 References
| Rotational viscometers uses the idea that the force required to turn an object in a fluid, can indicate the viscosity of that fluid. The common Brookfield-type viscometer determines the required force for rotating a disk or bob in a fluid at known speed. 'Cup and bob' viscometers work by defining the exact volume of sample which is to be sheared within a test cell, the torque required to achieve a certain rotational speed is measured and plotted. There are two classical geometries in "cup and bob" viscometers, known as either the "Couette" or "Searle" systems - distinguished by whether the cup or bob rotates. The rotating cup is preferred in some cases, because it reduces ..."
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