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Number of Employees Upto 10 People. Annual Turnover Upto Rs. Standard ASTM D establishes that this viscometer determines kinematic viscosity with accuracy equal to traditional gravimetric capillaries.
Instead of a rotating cup, it employs a small-size tube containing the sample, whereas the original bob is replaced by a hollow, freely floating rotor.
The entire system is located in a temperature-controlled copper block, which ensures stable conditions. A motor turns the tube at constant speed.
As the sample moves with the encircling tube, the viscous forces of the sample drive the floating rotor. A combination of hydrodynamic lubrication [16] and centrifugal forces pushes the rotor to the center of the sample.
The rotor holds a small permanent magnet that generates a rotating magnetic field. Any alternating magnetic field in an electrically conductive material such as copper induces eddy currents opposing their origin.
This effect slows the rotor down, while the sample forces accelerate it. Once the rotor attains an equilibrium speed, this speed is an indicator for dynamic viscosity.
The magnet inside the rotor further serves to measure the rotor speed: A Hall-effect sensor counts the frequency of the rotating magnetic field.
The non-contact sensor technology along with the rotor that is free from friction are the basis for the flexible measuring range from 0. Many applications, e.
From simultaneously measured density and dynamic viscosity, the instrument calculates kinematic viscosity. Mathematically put, dynamic viscosity is inversely proportional to the speed difference between tube n 2 and rotor n 1.
Equation 6: Dynamic viscosity is inversely proportional to the speed difference between tube and rotor.
MD … driving torque of the rotor MR … retarding torque of the rotor n1 … rotor speed n2 … tube speed K1, K2, K … constants; K is determined during adjustment.
Equations 7 to Equilibrium between driving torque related to viscosity and retarding torque electromagnetic forces. We use cookies on our website.
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Home Wiki How to measure viscosity. How to measure viscosity The principles introduced in this section represent a cross-section from traditional to technically advanced methods.
Gravimetric capillaries and flow cups True to their name, gravimetric capillaries — as well as flow cups — rely on gravitational force as the drive.
How the gravimetric flow principle works Take a capillary with precisely specified dimensions inner diameter, length and an equally precise distance given by two marks.
Types of available glass capillaries Generally, gravimetric capillaries are made of glass. Typical representatives of glass capillaries.
Figure 2: Established types of glass capillaries: Ostwald capillary named after Wilhelm Ostwald, — , German chemist [2] Ubbelohde capillary named after Leo Ubbelohde, — , German chemist [3] Cannon-Fenske capillary a modified Ostwald capillary, designed by Dr.
Michael R. Cannon, American scientist, inventor, and educator, and Merrell Robert Fenske, — [4] Houillon capillary Standard ASTM D describes measurement using this capillary type.
Manual gravimetric capillaries With traditional glass capillary viscometers, the flow time is taken manually utilizing a stop watch, which demands full concentration and exact work from the operator.
Automatic gravimetric capillary viscometer To save working time and material resources, automatic varieties of gravimetric capillary viscometers were developed.
Types of flow cups Flow cups are used for testing all kinds of coatings, but also ceramic suspensions, drilling fluids, and even hot bitumen.
Pressurized capillary viscometers Apart from capillary viscometers driven by gravity, there are also pressurized devices in use.
Capillary viscometers utilizing a weight Figure 4. Low-pressure capillary viscometer utilizing a weight and gravity. Weight Steel piston Steel cylinder Heating and insulation Polymer melt Die Extrudate.
Falling-ball and Rolling-ball viscometers Figure 5. How the rolling-ball principle works A ball of known dimensions rolls or falls through a closed capillary, which contains the sample liquid.
These three principal forces determine the viscosity equation:. Rolling-ball microviscometer The rolling-ball microviscometer implements a further development of the Hoeppler principle.
Generally, a microviscometer is best suited for measuring liquids in the low-viscosity range. Rotational viscometers Rotational viscometers push the upper limit of the potential measuring range further than gravity-based devices.
Depending on which part is driven, there are two principles: the Couette principle the Searle principle.
Couette principle The motor drives the cup while the bob is stationary. Physics of the Searle principle The motor turns a measuring bob or spindle in a container filled with sample fluid.
Types of rotational viscometers Besides the two varieties of the rotational measuring principle, there are manifold designs of measuring bobs. Spring instruments Spring instruments feature a two-part axis connected via a spiral spring and a pivot.
Servo motor instruments This instrument type is equipped with a servo motor and a high-resolution digital encoder. Measuring bobs for rotational viscometers An extensive quantity of different measuring bobs serves to test various types of substances.
Figure Disc spindles used with rotational viscometers. Figure Cylindrical spindles used with rotational viscometers.
Figure Specially shaped spindles used with rotational viscometers. T-bar spindle for paste-like substances Krebs spindle, used in the paint and coatings industry [11] Paste spindle Vane spindle for gel structures that are extremely shear-sensitive e.
Coaxial cylinder systems Coaxial or concentric cylinder systems are absolute measuring systems, which also conform to DIN and ISO. Equation 4: Shear rate in coaxial cylinder systems.
Further, the lower temperature and solidification time are thought to be a direct result of the supercooling that is achievable through the influx of kinetic energy via shearing, which is used to modify the solidification process.
The knowledge of the rheology of the alloy during cooling and in the semi-solid temperature range is critical for optimization of the thixocasting and rheocasting processes.
Both of these processes require the alloy to be considered a quite complex fluid, which necessitates the employment of rheology to be fully understood.
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Roopa gives birth to a baby. During Roopa's pregnancy, her younger sister Gunja Sadhana Singh comes to live with her.
While there, she falls in love with Omkar's younger brother Chandan Sachin. Learning of their love, Roopa promises to help them marry.
But, she dies in an accident; and nobody else knows about the love affair. The farmer and the Vaidya decide that Gunja should marry the widower Omkar, to take care of her sister's baby.
But moments before the wedding rituals are completed, Chandan and Gunja's love affair is revealed. He is allowed to marry Gunja with everyone's consent.
The rural culture and languages of Uttar Pradesh are portrayed authentically in the film. The movie is based on the first half of the novel.
It changes the partners in the second marriage, as the novel had the proposed marriage between Gunja and Omkar taking place.
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