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Decreases in direct Replacement of Viscometer

Posted On : Jan-17-2012 | seen (416) times | Article Word Count : 911 |

These devices are also known as a glass capillary viscometers or Ostwald viscometers named after Wilhelm Ostwald.
These devices are also known as a glass capillary viscometers or Ostwald viscometers named after Wilhelm Ostwald. Ubbelohde viscometer in the next version, which consists of a U-shaped glass tube, held vertically in a temperature-controlled bath. On one hand u exactly narrow vertical hole section (capillaries). Above, the light is another light bulb to reduce the other hand. Used in the liquid is drawn into the upper bulb suction, and then allowed to flow through the capillary into the lower bulb. Two marks (one above and below the upper bulb) indicate a known volume. Liquid level to pass the time between these marks is proportional to the kinematic viscosity. Most commercial units conversion factor, or can be calibrated with the known properties of the liquid.

The time required for testing fluid flow through a number of factors between the two marked points of known diameter of the capillary is measured. The result is multiplied by a factor of time viscometer, the kinematic viscosity.

These viscometers are also classified as direct flow or reverse flow. Reverse flow viscometers markings over the reservoir and direct flow below the reservoir markings. Classifications exists so that it can be determined even if the paint or opaque liquids are measured, otherwise the liquid will cover the marking and it is impossible to assess the level passes a sign. It also allows the viscometer to have more than one character set to be immediately due course of time it takes to reach 3 digits, so gives 2 times and then allows the calculation of Determinability ensure accurate results.
Falling in viscometers
Creeping flow past the area.

Stokes' law of diminishing field viscometer, the liquid standing in a vertical glass tube. Of course, the size and density of the sphere allowed to descend through the liquid. If properly selected, it reaches terminal velocity, which can be measured from the time it takes to pass two marks on the pipe. Electronic sensing can be used for opaque fluids. Knowing the terminal velocity, size and density of the sphere and the density of the fluid, Stokes' law can be used to calculate the fluid viscosity. varying diameter steel ball bearings are commonly used in the classic series of experiments with the aim to improve the calculation accuracy. glyceryl school experiment uses as a liquid and technique is used industrially to check the viscosity of liquids used in the process. It includes many different oils, and polymer liquids such as solutions.

Decreasing piston viscometer

Also known as the inventor of the viscometer in Norcross, Norcross, Austin. This robust and sensitive industrial unit of viscosity measurement principle is based on the piston and cylinder assembly. Periodically raised air piston lift mechanism for drawing a measured clearance (GAP), an area which is formed under the push, as it raised between the piston and the cylinder walls. Assembly usually takes place a few seconds, then allowed to fall gravity, send a sample in the same way it entered, creating shear effects measured in the liquid, which makes this particularly sensitive to the viscometer, and a good measurement of thixotropic fluid. Fall time is a measure of viscosity, with the piston inside the cylinder and forming orifice payment. Viscosity control measures fall time (time to fall in seconds, measure the viscosity) and shows the viscosity value. The controller may be calibrated time to drop the value of a cup of seconds (of course, efflux cup), SSU or centipoise.
Industrial use is popular because of simplicity, repeatability, low maintenance and durability. This type of measurement does not affect the flow or external vibrations. The operating principle can be adopted for a variety of conditions, making it ideal for process control environment.
Oscillating piston viscometer

Sometimes, as EMC or electromagnetic viscometer viscometer, viscosity of Cambridge (formerly Cambridge Applied Systems) was invented in 1986. Sensor (see figure below) consists of the measuring chamber and the piston magnetically affected. Measurements, which sample is the first time in heat-controlled measuring chamber, which is home to the piston. Electronics to drive the piston in motion the fluctuation within the measurement chamber with a controlled magnetic field. Shear stress the liquid (or gas), the piston and the viscosity is determined by measuring the travel time, the plunger. Ring-shaped gaps between the piston and the measuring chamber, the electromagnetic field strength and the piston travel distance of the construction parameters are used to calculate the viscosity according to Newton's law of viscosity.

Oscillating piston viscometer technology has been applied to a small sample viscosity and micro-viscosity model of laboratory testing applications. It has also been adapted to measure the viscosity of the high pressure and high temperature viscosity measurements of both laboratory and process environments. Viscosity sensors have been scaled for a wide range of industrial applications, such as low-level viscometers used compressors and motors, flow viscometers by dip coating processes, the line viscometers for oil refineries and hundreds of other applications. Sensitivity of modern electronics development, to promote academic research laboratories in viscosity of the gas piston Oscillating viscometer popularity growth.
Vibrational viscometers

Vibrational viscometers dates back to 1950 BENDIX measure, which is a class, that is, to measure the vibrations of electromechanical resonator immersed in a liquid whose viscosity is to be the inhibition. , Resonator vibrates, torsion or transversely (cantilever beam or tuning fork). The higher the viscosity, the greater the inhibition found resonator. Resonator damping can be measured by several methods

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