Vertical Falling Ball viscometer viscosity measurement
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Posted On :
Dec-29-2011
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Article Word Count :
536
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The methods used to measure fluid viscosity. This is usually based on one of the three events in a moving surface in contact with liquid, the object moves through a fluid, the fluid flows through the resistive component.
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The methods used to measure fluid viscosity. This is usually based on one of the three events in a moving surface in contact with liquid, the object moves through a fluid, the fluid flows through the resistive component. These events are used for three major industrial viscometers, ie rotating viscometer - a falling-ball viscometer and a capillary viscometer. Falling ball viscometer usually means Newtonian liquid and gas viscosity. Newton's method is used for movement by the right balance between power, area with the ball when it reaches terminal velocity. Newton's laws of motion with the ball, there is a buoyancy force, gravity and drag force, and these three forces to achieve the net force is zero. Drag force can be obtained from Stokes' law, which is valid for Reynolds numbers less than 1.1 to 3
Strike the ball viscometer is well suited to measure the viscosity of the fluid and the method was defined in the international standards.4, 5 international standards, the approach is different from the principle described in refs. 1-3. Standards tend to describe the tube method, in which a tube with a ball was inclined 10 ° from the vertical. In addition, six balls have been used with varying diameters of various dynamic viscosity measurement ranges and suitable ball can be chosen in the autumn when the ball is at times less than the minimum fall times of test procedure. The ball rolling and sliding movement of the liquid sample times inclined cylindrical measuring tube. Sample viscosity is correlated with the time the ball drop a distance, and the test results as the dynamic viscosity.
Brizard et al.6 developed an absolute, with the ball viscometer and can cover a wide range of viscosity, while maintaining low uncertainty. This method is considered the edge of inertia and so on, and adjusted to relative measurement uncertainty of 0.001 procedures. Capper Ltd (Stoke-on-Trent, Staffordshire, United Kingdom) has developed an improved viscosity measurement instruments (patent no. GB1491865). Instrument in the first and second coils of different known locations around the dip tube, to record a time in order to avoid human error. Nevertheless, the machine is only an application for a stainless steel ball.
Although the method which the ball was well developed and submitted to international standards, it is a bit awkward to operate this type of viscometer. For example, the viscometer must be six different diameter balls evaluate different viscosity range, and the user must run the test, choose the right ball. In addition, it is difficult to determine when the ball enters the terminal fall velocity, ie, whether there is sufficient distance between the beginning of the entry line and enter the position. In addition, the inclined-tube viscometer at 10 ° vertical, so drop the ball is not only falling, but also rolling. This phenomenon is different from the conditions under which the ball when a method.1-3 The objective of this study was to establish a new method based on the traditional method with the ball as regards the dynamic equations describing the behavior of the ball with a vertical pipe. Because this type of viscometer vertically in the ground, he will be here as a vertical with the ball viscometer.
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Article Source :
http://www.articleseen.com/Article_Vertical Falling Ball viscometer viscosity measurement_126203.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
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Business
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