What is the Ostwald viscometer?
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Posted On :
Jan-12-2012
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Article Word Count :
526
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Ostwald viscometer, also known as the viscosimeter is a device used to measure the viscosity of the fluid by a single type of flow condition.
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Ostwald viscometer, also known as the viscosimeter is a device used to measure the viscosity of the fluid by a single type of flow condition. The fluid viscosity fluid flow resistance. It can be thought of as fluid friction, often referred to as internal friction or thickness.Instead of measuring fluid movement, when those other types of measuring movement of the object through a liquid, for example, falls in with the piston or the rising air bubbles. Use and accuracy of various types of viscometers may vary.
Ostwald viscometer is also known as the U-tube viscometer capillary viscometer or. The device uses a direct or inverse test fluid flow through the U-shaped tube to measure the viscosity of the fluid. Ostwald viscometer measurement is determined by noting the time required for fluid flow within a certain distance of a diameter concrete pipe.
Ostwald viscometer all sides of different size tubes. Lower half of the tubes are covered by a capillary tube. Direct-flow viscometer, the light is located on the top side of the capillary. A wider diameter side, slightly larger than the light is located toward the bottom.
Two brands are known the distance between the tubes. These characters are less light above and below. Reverse flow viscometers, the wider side of the bulb above the capillary side of the bulb.
Measurement of flow rate measurement or Ostwald, suction is used to draw the narrow tubes of liquid until it rises above the upper mark. Fluid is released, and measured the time required to transfer fluid between two points. Ostwald viscometer is used to calculate the flow of liquid viscosity using the Poiseuille equation.
In addition to Ostwald viscometer, there are several other types of viscometers use,. This includes decreasing the field of viscometers, viscometers fall of the piston, vibrational viscometers, viscometers, and rotating bubble viscometers. Instead of measuring fluid movement, when those other types of measuring movement of the object through a liquid, for example, falls in with the piston or the rising air bubbles. Use and accuracy of various types of viscometers may vary.
Non-Newtonian fluids is not defined by Sir Isaac Newton Fluid mechanics of the Law, and viscosity, higher shear rate decreases. This is called a thixotropic fluid, and its viscosity increases with shear rate decreased as well. They consist of the material is suspended in liquid. It is impossible to directly measure the absolute non-Newtonian fluid viscosity. Apparent viscosity must be determined by the shear rate and the initial measurement of the temperature of the liquid.
Absolute viscosity of oil gives an accurate oil film thickness. This value is important to investigate the oil field and production facilities. Standard based on the absolute viscosity of water at 68 ° F (about 20 ° C) was created in 1930, which made a lot easier to determine the viscosity of other liquids. This value is used to calibrate viscometers and oil samples, and is a very important measurement to predict the behavior of oils and their quality rating. Special laboratory and on-site instruments used to accurately assess the viscosity of the fluid, where it is most important.
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Article Source :
http://www.articleseen.com/Article_What is the Ostwald viscometer?_132792.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,
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