Stormer Viscometer Rotating Tool
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Posted On :
Jan-09-2012
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Article Word Count :
519
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Rotational viscometers use the idea that the torque needed to rotate the object in the liquid, you can specify that the fluid viscosity.
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Rotational viscometers use the idea that the torque needed to rotate the object in the liquid, you can specify that the fluid viscosity.
Brookfield-type viscometer provides the necessary torque of the rotating disk or Bob the speed of liquid.
Cup and bob "viscometers are working with a precise amount of sample to the test room must be sheared through, it is necessary to achieve a certain speed measured torque and plotted. There are two classic" cup and bob 'viscometers geometry, known as the "duvet" or " Searle "systems vary according to whether a cup or bob rotates. Levitating Cup a priority in some cases, because it reduces turbulence at the beginning of Taylor's, but it is difficult to accurately thermostat.
Cone and Plate viscometers use a very shallow angle cone bore a contact plate. With this system, the shear rate after the plate is constant modest degree of precision and deconvolution flow curve, shear stress in the graph (torque) against shear rate (angular velocity) viscosity of a simple way.
Changing the classic "duvet rotational viscometer, the kinematic viscosity is similar to the accuracy achieved. Internal cylinder viscometer Stabinger hollow and specifically lighter than the sample, the sample is floating freely, center the centrifugal forces. The former is inevitable bearing friction, and therefore entirely preventable. Speed ??and torque measurement implemented without direct contact, rotating magnetic field and eddy current brake. This allows unprecedented torque resolution of 50 PNM and a very large measurement range from 0.2 to 20,000 mPa.s to a measurement system. Built-in density measurements with the oscillating U-tube principle allows to determine the kinematic viscosity measured by the dynamic viscosity ratio has
Various types of viscometer
Other viscometer types of bubbles, balls or other objects. Viscometers that can characterize non-Newtonian fluid behavior, which are commonly called rheometers or plastometers. Search of the bubble, the free dictionary. ... Rheometers are viscometers, which can measure the visco-elastic properties of materials, but only as a viscosity. ... Plastometer is a tool used to determine the flow properties of plastic materials. ...
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:
First Measurements can be regarded as a constant amplitude oscillator vibrating. The higher the viscosity, the more power is needed to maintain the oscillation amplitude.
The second Vibration measurement of decay time of the excitation is turned off. The higher the viscosity, the faster the signal decays.
The third Measuring the phase angle between excitation and response signals function resonator frequency. The higher the viscosity, the higher the frequency of change of phase change.
Vibrational instrument also suffers from the shear field, so it is not suitable for measuring liquid viscosity, the flow behavior is of course up to half are missing.
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Article Source :
http://www.articleseen.com/Article_Stormer Viscometer Rotating Tool_130746.aspx
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Author Resource :
Visit viscometer.co for all types of viscometer according to your need.
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Keywords :
viscometer, digital viscometer,
Category :
Business
:
Business
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