Explain Types Of Viscometer

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Explain Types Of Viscometer

Posted On : Nov-12-2011 | seen (453) times | Article Word Count : 710 |

Also known as Norcross viscometer for the inventor, Austin Norcross. The principle of measuring viscosity harsh industrial and sensitive equipment is based on the piston and cylinder.

Viscometer piston fall

Also known as Norcross viscometer for the inventor, Austin Norcross. The principle of measuring viscosity harsh industrial and sensitive equipment is based on the piston and cylinder. The piston is made from time to time the air-lift device, drawing the material is measured to the clearance (GAP) space between the piston and cylinder wall, which consists of over piston as it presents itself. The assembly is then typically only a few seconds, then dropped by gravity, will launch the very way in which he has created a cutting effect of the liquid, which makes it particularly sensitive to the viscometer, and a good measure of some thixotropic fluids. Autumn is a time to measure the viscosity, where the game and the piston within a cylinder bore. Decrease in viscosity controller measures the time (Time-of-seconds to fall in the measurement of viscosity) and the result shows the value of viscosity. Controller can be calibrated for the second time value reduction cup (known efflux Cup), SSU or centipoise.

Industrial use is popular because of, easy repeatability, low maintenance and longevity. This type of measurement does not affect the flow or external vibrations. The principle of operation can be done a number of different conditions, so it is ideal for process control environments.

Oscillating piston viscometer

Sometimes called EMV electromagnetic viscometer viscometer, the viscosity was invented in Cambridge in 1986. The sensor (see figure below) includes a piston chamber and the magnetic influence. Measurements are taken in a sample is first introduced in the measuring chamber of controlled temperature, where the piston. Drive Electronics oscillating piston movement in the measuring chamber with a controlled magnetic field. Shear stress is imposed on the liquid (or gas), because the piston and the viscosity is determined by measuring the travel time of the piston. The design parameters for the annular space between the piston and the measuring chamber, the electromagnetic field intensity, and distance of movement of the piston is used to calculate the viscosity according to Newton's law of viscosity.

Vibrating viscometers

Vibrational viscometers date back to the 1950s Bendix instrument, which is a class that works by measuring the damping of oscillating electromechanical resonator immersed in a fluid whose viscosity is to be determined. The resonator generally oscillates in torsion or transverse (as a beam or tuning fork). The higher the viscosity, the greater the attenuation imposed resonator. The resonator is the attenuation can be measured by several methods:

1. Measuring the power necessary to maintain the input oscillator vibrates with constant amplitude. The higher the viscosity, the more power is needed to keep the oscillation amplitude.

Second measure the decay time of vibration when the excitation is turned off. The higher the viscosity, the faster the signal decays.

3. Measuring the frequency of the resonator as a function of phase angle between excitation waveforms and response. The higher the viscosity, the higher the frequency change for a given phase shift.

Vibrating tool also suffers from a lack of defined field of cutting, making it suitable for measuring the viscosity, the flow is not known in advance.

Viscometers rotational speed

Rotational viscometers use the idea that the torque required to rotate an object in a fluid is a function of the viscosity of the fluid. They measure the torque required to rotate a disk or bob in a liquid with a known rate.

"Cup and Bob Viscometers work in defining the exact number of samples, which is broken inside the testisolulle, the torque required to reach a certain speed is measured and tracked There are two classical geometries." Cup and bob "viscometers, which is known as a" couette "or" Searle "systems - if you keep a cup or bob rotates. Rotary Cup helped in some cases, because it reduces the onset of Taylor vortices, but it is difficult to measure accuracy.

"Cone and plate viscometers' using a very shallow angle cone in contact with a bare flat plate. With this system, the cutting speed is constant below the plate to a modest degree of precision and deconvolution of a flow curve , a graph of shear stress (torque) against shear rate (angular velocity) gives the viscosity directly.

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<h1>Explain Types Of Viscometer</h1> Author: <a href='http://www.articleseen.com/profile_Viscometer.aspx'>Viscometer</a> Viscometer piston fall

Also known as Norcross viscometer for the inventor, Austin Norcross. The principle of measuring viscosity harsh industrial and sensitive equipment is based on the piston and cylinder. The piston is made from time to time the air-lift device, drawing the material is measured to the clearance (GAP) space between the piston and cylinder wall, which consists of over piston as it presents itself. The assembly is then typically only a few seconds, then dropped by gravity, will launch the very way in which he has created a cutting effect of the liquid, which makes it particularly sensitive to the viscometer, and a good measure of some thixotropic fluids. Autumn is a time to measure the viscosity, where the game and the piston within a cylinder bore. Decrease in viscosity controller measures the time (Time-of-seconds to fall in the measurement of viscosity) and the result shows the value of viscosity. Controller can be calibrated for the second time value reduction cup (known efflux Cup), SSU or centipoise.

Industrial use is popular because of, easy repeatability, low maintenance and longevity. This type of measurement does not affect the flow or external vibrations. The principle of operation can be done a number of different conditions, so it is ideal for process control environments.

Oscillating piston viscometer

Sometimes called EMV electromagnetic viscometer viscometer, the viscosity was invented in Cambridge in 1986. The sensor (see figure below) includes a piston chamber and the magnetic influence. Measurements are taken in a sample is first introduced in the measuring chamber of controlled temperature, where the piston. Drive Electronics oscillating piston movement in the measuring chamber with a controlled magnetic field. Shear stress is imposed on the liquid (or gas), because the piston and the viscosity is determined by measuring the travel time of the piston. The design parameters for the annular space between the piston and the measuring chamber, the electromagnetic field intensity, and distance of movement of the piston is used to calculate the viscosity according to Newton's law of viscosity.

Vibrating viscometers

Vibrational viscometers date back to the 1950s Bendix instrument, which is a class that works by measuring the damping of oscillating electromechanical resonator immersed in a fluid whose viscosity is to be determined. The resonator generally oscillates in torsion or transverse (as a beam or tuning fork). The higher the viscosity, the greater the attenuation imposed resonator. The resonator is the attenuation can be measured by several methods:

1. Measuring the power necessary to maintain the input oscillator vibrates with constant amplitude. The higher the viscosity, the more power is needed to keep the oscillation amplitude.

Second measure the decay time of vibration when the excitation is turned off. The higher the viscosity, the faster the signal decays.

3. Measuring the frequency of the resonator as a function of phase angle between excitation waveforms and response. The higher the viscosity, the higher the frequency change for a given phase shift.

Vibrating tool also suffers from a lack of defined field of cutting, making it suitable for measuring the viscosity, the flow is not known in advance.

Viscometers rotational speed

Rotational viscometers use the idea that the torque required to rotate an object in a fluid is a function of the viscosity of the fluid. They measure the torque required to rotate a disk or bob in a liquid with a known rate.

"Cup and Bob Viscometers work in defining the exact number of samples, which is broken inside the testisolulle, the torque required to reach a certain speed is measured and tracked There are two classical geometries." Cup and bob "viscometers, which is known as a" couette "or" Searle "systems - if you keep a cup or bob rotates. Rotary Cup helped in some cases, because it reduces the onset of Taylor vortices, but it is difficult to measure accuracy.

"Cone and plate viscometers' using a very shallow angle cone in contact with a bare flat plate. With this system, the cutting speed is constant below the plate to a modest degree of precision and deconvolution of a flow curve , a graph of shear stress (torque) against shear rate (angular velocity) gives the viscosity directly.About the Author: Visit viscometer.co for all types of <a rel="nofollow" href="http://www.viscometer.co/">viscometer</a> according to your need. Article Source: <a href='http://www.articleseen.com/Article_Explain-Types-Of-Viscometer_103398.aspx'> http://www.articleseen.com/Article_Explain Types Of Viscometer_103398.aspx</a>

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