What is the principle behind viscometer experiment?
The principle of the viscometer is to determine the falling time of a sphere with known density and diameter within a fluid filled inside glass tube. The viscosity of the fluid sample is related to the time taken by the sphere to pass between two specified lines on the cylindrical tube.
How does a glass capillary viscometer work?
Capillary viscometers utilize a U-shaped glass tube with bulbs at either end—one higher than the other. The fluid’s viscometry is related to how long a defined quantity of fluid takes to pass a defined distance through the tube (of a defined diameter).
What are the different types of viscometer?
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 difference between Ostwald and Ubbelohde viscometer?
Ostwald Viscometer and Ubbelohde viscometer are two such instruments. The key difference between Ostwald and Ubbelohde viscometers is that Ostwald Viscometer is suitable for the measurement of low to moderate viscosity of liquids whereas Ubbelohde viscometer is suitable for the measurement of high viscosity of liquids.
What type of material can be determined using the capillary viscometer?
A capillary viscometer is an instrument used to measure the viscosity, or thickness, of a liquid by measuring how long it takes the liquid to flow through a small-diameter tube, or capillary.
What is a uubbelohde viscometer?
Ubbelohde Viscometers are used to determine kinematic viscosity of transparent Newtonian liquids. Sample volume: aprox. 15 ml. Precision: ±0.2%. *Fungilab offers many types of glass capillary viscometers that are not listed in our catalog. We can also manufacture glass capillary viscometers with customer-specified constants.
What does the cannon-Ubbelohde viscometer measure?
The Cannon-Ubbelohde Viscometer, with a more rugged design than standard Ubbelohde viscometers, measures kinematic viscosity of transparent Newtonian liquids according to ASTM D445 and ISO 3104. Minimum sample volume is 11 mL. Minimum bath depth is 254 mm (10 in) but it must be submerged to 220 mm (8.5 in).
Does fungilab offer other types of glass capillary viscometers?
*Fungilab offers many types of glass capillary viscometers that are not listed in our catalog. We can also manufacture glass capillary viscometers with customer-specified constants. Viscometers with special constants, added temps, and before/after data are available by special order. For further information contact Fungilab.
Which viscometer should I use for kinematic viscosity determinations?
Primarily because no single capillary viscometer is ideally suited for all kinematic viscosity determinations. Individual analysts also have their own preferences. The brief descriptions on the following page may assist you in determining which viscometer is most appropriate for your particular application.