A Description About The Viscometer

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A Description About The Viscometer

Posted On : Nov-12-2011 | seen (625) times | Article Word Count : 590 |

Viscometer (also called viscosimeter) is an instrument used to measure the viscosity of the fluid. Viscosity of the fluid flow conditions ranging from the instrument called a rheometer used. Viscometers only measure of an air flow.

In general, liquid or an object remains stationary and moving through it, or the object is stationary and the fluid moves past. The drag caused by the relative motion of the fluid and a surface is a measure of viscosity. Flow conditions must have a sufficiently small value of Reynolds number for laminar flow there.

The viscosity of water at 20.00 degrees of 1002 mPa · s, and its kinematic viscosity (ratio of the viscosity and density) is 1.0038 mm 2 / s. These values are used to calibrate the specific types of viscometer.

U-tube viscometers

These devices are also known as capillary viscometers Ostwald viscometer glass and the name of Wilhelm Ostwald. Another version is the Ubbelohde viscometer, which consists of a glass tube U-shaped upright in a temperature controlled bath. In one of the arms of the U is a vertical section of narrow gauge accuracy (capillaries). Above is a bulb with another bulb is lower in the other arm. In practice, the liquid is introduced into the upper bulb by suction and then allowed to flow through the capillaries in the bottom of the bulb. Two marks (one above and one below the upper bulb) indicate a known volume. The time required for the level of fluid to pass between the marks is proportional to the kinematic viscosity. Most business units are supplied with a conversion factor, or can be calibrated by a fluid of known properties.

The time required to test the fluid to flow through a capillary of known diameter by a factor of between two marked points are measured. By multiplying the time by the factor of the viscometer, the kinematic viscosity is obtained.

Viscometers which are also classified as direct or reverse flow stream. Backflow viscometers a reservoir above the markings and direct the stream of those who have a tank under the headings. Such classifications exists so that the level can be determined even in the case of opaque or colored liquids are measured, otherwise the liquid covers the markings, and impossible to measure the level of marking the passage of time. This also allows the viscometer is more than a set of signs immediately allows you to schedule time to get the third character, thus producing two times and allows the calculation of the next determinability to ensure accurate results.

falling ball viscometer

Creeping flow past the ball.

Stokes 'law' is based on belonging to the ball viscometer, where the fluid is stationary vertical glass tube. The ball is known for the size and density are allowed to fall through the liquid. If properly selected, it reaches a terminal velocity, which can be measured by the time it takes to pass two marks on the tube. Electronic identification can be used for opaque fluids. Knowing the terminal velocity, the size and density of the ball, and the density of the liquid, Stokes 'law' to calculate the viscosity of the fluid. Series of steel ball bearings of different diameter is normally used classic experiment to improve the accuracy of the calculation. The experiment uses glycerine as a medium school, and the technique is used industrially to control the viscosity of fluids used in processes. It contains a wide variety of oils and fluids such as polymer solutions.

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<h1>A Description About The Viscometer</h1> Author: <a href='http://www.articleseen.com/profile_Viscometer.aspx'>Viscometer</a> Viscometer (also called viscosimeter) is an instrument used to measure the viscosity of the fluid. Viscosity of the fluid flow conditions ranging from the instrument called a rheometer used. Viscometers only measure of an air flow.

In general, liquid or an object remains stationary and moving through it, or the object is stationary and the fluid moves past. The drag caused by the relative motion of the fluid and a surface is a measure of viscosity. Flow conditions must have a sufficiently small value of Reynolds number for laminar flow there.

The viscosity of water at 20.00 degrees of 1002 mPa · s, and its kinematic viscosity (ratio of the viscosity and density) is 1.0038 mm 2 / s. These values are used to calibrate the specific types of viscometer.

U-tube viscometers

These devices are also known as capillary viscometers Ostwald viscometer glass and the name of Wilhelm Ostwald. Another version is the Ubbelohde viscometer, which consists of a glass tube U-shaped upright in a temperature controlled bath. In one of the arms of the U is a vertical section of narrow gauge accuracy (capillaries). Above is a bulb with another bulb is lower in the other arm. In practice, the liquid is introduced into the upper bulb by suction and then allowed to flow through the capillaries in the bottom of the bulb. Two marks (one above and one below the upper bulb) indicate a known volume. The time required for the level of fluid to pass between the marks is proportional to the kinematic viscosity. Most business units are supplied with a conversion factor, or can be calibrated by a fluid of known properties.

The time required to test the fluid to flow through a capillary of known diameter by a factor of between two marked points are measured. By multiplying the time by the factor of the viscometer, the kinematic viscosity is obtained.

Viscometers which are also classified as direct or reverse flow stream. Backflow viscometers a reservoir above the markings and direct the stream of those who have a tank under the headings. Such classifications exists so that the level can be determined even in the case of opaque or colored liquids are measured, otherwise the liquid covers the markings, and impossible to measure the level of marking the passage of time. This also allows the viscometer is more than a set of signs immediately allows you to schedule time to get the third character, thus producing two times and allows the calculation of the next determinability to ensure accurate results.

falling ball viscometer

Creeping flow past the ball.

Stokes 'law' is based on belonging to the ball viscometer, where the fluid is stationary vertical glass tube. The ball is known for the size and density are allowed to fall through the liquid. If properly selected, it reaches a terminal velocity, which can be measured by the time it takes to pass two marks on the tube. Electronic identification can be used for opaque fluids. Knowing the terminal velocity, the size and density of the ball, and the density of the liquid, Stokes 'law' to calculate the viscosity of the fluid. Series of steel ball bearings of different diameter is normally used classic experiment to improve the accuracy of the calculation. The experiment uses glycerine as a medium school, and the technique is used industrially to control the viscosity of fluids used in processes. It contains a wide variety of oils and fluids such as polymer solutions.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_A-Description-About-The-Viscometer_103397.aspx'> http://www.articleseen.com/Article_A Description About The Viscometer_103397.aspx</a>

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