Who invented viscometer?
chemist Leo Ubbelohde
The device was developed by the German chemist Leo Ubbelohde (1877-1964). ASTM and other test methods are: ISO 3104, ISO 3105, ASTM D445, ASTM D446, ASTM D4020, IP 71, BS 188. The Ubbelohde viscometer is closely related to the Ostwald viscometer.
Who discovered viscosity?
Jean Léonard Marie Poiseuille
Viscosity is a measurable quantity that denotes a liquid’s thickness. A relatively thin liquid, such as water, has lower viscosity than a thicker liquid, such as honey or oil. The measurement was discovered by French physicist Jean Léonard Marie Poiseuille.
What is the principle of viscometer?
These viscometers use the principle of ‘rotational viscometry’, i.e. their measurement of product viscosity is based upon immersing a specifically selected spindle within a sample of the product followed by measurement of the torque required to rotate the spindle at a set speed whilst immersed within the product sample …
How many types of viscometers are there?
Three main types of viscometer are used: capillary tube (e.g., Ostwald), coaxial cylinder (e.g., Brookfield, Couette) and falling sphere (e.g., Hoeppler). For research, a sophisticated controlled stress rheometer such as a Carrimed or Bohlin may be used.
What is Redwood number?
Viscosity, defined as rate of flow of oil from a Redwood viscometer.
Which oil is used in Redwood viscometer?
A redwood viscometer is used to measure the flow of eight different liquids including engine oil, sunflower oil, soybean oil, glycerol, thermic fluid (Hy- therm), coconut oil, water and ghee.
Why are fluids named Newtonian?
Newtonian fluids are the simplest mathematical models of fluids that account for viscosity. Newtonian fluids are named after Isaac Newton, who first used the differential equation to postulate the relation between the shear strain rate and shear stress for such fluids.
What is MacMichael viscometer?
The MacMichael viscometer is a Couette type viscometer. This comes under the category of cup and bob viscometers. This viscometer functions by rotating the cup and then there’s a viscous drag on the bob which is produced by the liquid that is to be measured.
Who invented Redwood Viscometer?
Notes. Sir Boverton Redwood, a consultant to the oil industry, designed this instrument in 1885. It was based on an earlier design by chemist C Rumble, an employee of Price’s Patent Candle Company of Battersea, London, UK.