A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid. For liquids with viscosities which vary with flow conditions, an instrument called a rheometer is used. Thus, a rheometer can be considered as a special type of viscometer.[1] Viscometers can measure only constant viscosity, that is, viscosity that does not change with flow conditions.
In general, either the fluid remains stationary and an object moves through it, or the object is stationary and the fluid moves past it. The drag caused by relative motion of the fluid and a surface is a measure of the viscosity. The flow conditions must have a sufficiently small value of Reynolds number for there to be laminar flow.
At 20°C, the dynamic viscosity (kinematic viscosity × density) of water is 1.0038mPa·s and its kinematic viscosity (product of flow time × factor) is 1.0022mm2/s. These values are used for calibrating certain types of viscometers.
^Barnes, H. A.; Hutton, J. F.; Walters, K. (1989). An introduction to rheology (5. impr. ed.). Amsterdam: Elsevier. p. 12. ISBN 978-0-444-87140-4.
A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid. For liquids with viscosities which vary with flow conditions...
An Ubbelohde type viscometer or suspended-level viscometer is a measuring instrument which uses a capillary based method of measuring viscosity. It is...
A Mooney viscometer is an instrument used for measuring the Mooney viscosity of rubbers. Invented by Melvin Mooney, it contains a rotating spindle and...
The Rotating disk viscometer, or "Mooney Machine" as it is sometimes referred to in the rubber industry, is the standard viscometer for measuring material...
temperature, to flow through a calibrated tube, is measured, using a Saybolt viscometer. The Saybolt universal viscosity test occurs at 100 °F (38 °C), or more...
cP). A single viscosity measurement at a constant speed in a typical viscometer is a measurement of the instrument viscosity of a fluid (not the apparent...
require more parameters to be set and measured than is the case for a viscometer. It measures the rheology of the fluid. There are two distinctively different...
10–20 cSt. To maintain this value a combination of viscometer, PID controller and heater is used. Viscometer measures the actual viscosity of the fuel, this...
has a much higher viscosity than water. Viscosity is measured using a viscometer. Measured values span several orders of magnitude. Of all fluids, gases...
inventor of a suspended-level viscometer used for determining kinetic viscosity, known today as a "Ubbelohde viscometer". Über Kondensationen der Isatinsäure...
viscometer employs load-based rotation to determine viscosity. The viscosity is reported in Krebs units (KU), which are unique to Stormer viscometers...
being extubated. Liquid thickness may be measured by two methods, with a viscometer or by line spread test. There are several levels of consistency/viscosity...
temperature properties measured by the cold-cranking simulator and mini-rotary viscometer. This standard is commonly used throughout the world, and standards organizations...
in the atmosphere. The principle is also applied in the falling sphere viscometer, an experimental device used to measure the viscosity of highly viscous...
solutes in water solutions. These devices came to be known as Ostwald viscometers and are in widespread use in contemporary times for research and quality...
T30-014 ASTM Cup 1–5, standard ASTM D1200 Flow cups Flow measurement Viscometer Zahn cup Viswanath, Dabir S., and Tushar K. Ghosh, Dasika H.L. Prasad...
2019. Ehrenstein & Eloy 2013, pp. 321–346. "Falling Ball Viscometer" (PDF). Falling Ball Viscometer. "Not Just Going with the Flow". American Scientist. 2017-02-06...
confirm the flow cup is measuring within specification. Flow measurement Viscometer Zahn cup Ford cup "Definition of VISCOSITY". Viscosity Archived 2013-05-12...
commonly detected by light scattering methods, a refractometer, or a viscometer to determine the concentration of the eluted copolymer. A common application...
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