There are several types of viscometers available, some for use in laboratories and others used as portable viscosity testers. U-Tube Viscometers. These viscometers are often used in laboratory settings. Falling Sphere Viscometers. Falling Piston Viscometers. Rotational Viscometers. Bubble Viscometers. Rheometers. The various viscometers used for determining the viscosity of different systems can be broadly divided into the following types: 1). method. Curiously, two communities work on vibrating-wire viscometers: one of .. The falling sinker-type viscometer is often used for precision high pressure.
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Viscosity can be thought of as a resistance to flow, with highly viscous fluids being more resistant to flow. Understanding the role of viscosity, and types of viscometers it, is key to correctly analyzing many engineering situations.
Using lubricating fluids that become types of viscometers viscous at high temperatures, for example, could be disastrous in a car engine. It is therefore sometimes important to be able to measure viscosity.
Engineers can do this by using viscosity measurement devices.
- Types of Viscosity Measurement Devices: Viscometers and Rheometers
- Viscometer - Wikipedia
- Viscosity Measurement Equipment
The most commonly used devices are viscometers and rheometers. This article explains the differences between the two devices and when each one is used.
They work for fluids whose viscosity does not change under varying flow conditions; rheometers must be used when the viscosity does change with flow conditions.
Viscometers usually work by comparing a stationary object and a fluid types of viscometers, or vice versa. Either the cone or the plate can rotate while the other part is held stationary. Photograph copyright of Chemical Engineering Department, University of Michigan, Ann Arbor, MI Usage Examples Rotational viscometers are used to measure the viscosity of a wide range of fluids from different industries.
Some specific examples include sauces, lotions, shampoos, and paints, as shown below. Rotational viscometers are also types of viscometers to measure the viscosity of liquid-like raw materials used in the chemical industry.
Visual Encyclopedia of Chemical Engineering
Copyright of Zenith Pumps, Monroe, NC There are many possible uses of rotational viscometers because of the various different configurations. A lower fluid viscosity results in less resistance to flow, which corresponds to a faster velocity of the moving object.
A falling ball viscometer is shown types of viscometers. The fluid is placed in a types of viscometers, such as a graduated cylinder. The motion of a ball, bubble, plate, needle, or rod through the fluid is monitored.
The viscosity controller measures the time of fall time-of-fall seconds being the measure of viscosity and displays the resulting viscosity value.
The controller can calibrate the time-of-fall value to cup seconds known as efflux cupSaybolt universal second SUS or centipoise. Industrial use is popular due to simplicity, repeatability, low maintenance and longevity.
This type of measurement is not affected by flow rate or external vibrations. The principle of operation can be adapted for many different conditions, making it ideal types of viscometers process control environments.
What are the different types of viscometer? What purpose do they serve? - Quora
types of viscometers Oscillating piston viscometer[ edit ] Sometimes referred to as electromagnetic viscometer or EMV viscometer, was invented at Cambridge Viscosity Formally Cambridge Applied Systems in The sensor see figure below comprises a measurement chamber and magnetically influenced piston.
Measurements are taken whereby a sample is first introduced into the thermally controlled measurement chamber where the piston resides. Electronics drive the piston into oscillatory motion within the measurement chamber types of viscometers a controlled magnetic field.
A shear stress is imposed on the liquid or gas due to the piston travel and the viscosity is determined by measuring the travel time of the piston. The oscillating piston viscometer technology has been adapted for small sample viscosity and micro-sample viscosity testing in laboratory applications.
It has also been adapted to measure high pressure viscosity and high temperature viscosity measurements in both laboratory and process environments. The viscosity sensors have types of viscometers scaled for a wide range of industrial applications such as small size viscometers for use in compressors and engines, flow-through viscometers for dip coating processes, in-line viscometers for use in refineries, and hundreds of other applications.
Improvements in sensitivity from modern electronics, is stimulating a growth in types of viscometers piston viscometer popularity with academic laboratories exploring gas viscosity. Vibrational viscometers[ edit ] Vibrational viscometers date back types of viscometers the s Bendix instrument, which is of a class that operates by measuring the damping of an oscillating electromechanical resonator immersed in a fluid whose viscosity is to be determined.
These viscometers are most often used for resins or varnishes. These viscometers are fast, and very useful for measuring viscosity in the field.