These viscometers use the principle of ‘ rotational viscometry ‘, i.e. their measurement of product viscosity is based upon immersing a specifically selected spindle within a sample of the product followed by measurement of the torque required to rotate the spindle at a set speed whilst immersed within the product sample ...
What is the purpose of viscometer?
A viscometer is an instrument used to measure fluid viscosity and the flow properties of liquids . Let’s discuss the various styles of viscometers, their internal characteristics and factors that go into performing a precise and repeatable viscosity measurement.
What is the principle of viscosity measurement?
The principle of viscosity is stated here: When a layer of liquid is subjected to move upon a surface or another layer of the same liquid, the fluid particles tend to oppose such movement ; this resisting force developed by a liquid is called viscosity.
What is viscosity class 9?
Viscosity is defined as the measure of the resistance of a fluid to gradual deformation by shear or tensile stress. In other words, viscosity describes a fluid’s resistance to flow .
What is SI unit of viscosity?
Dynamic viscosity: The SI physical unit of dynamic viscosity (μ) is the Pascal-second (Pa s) , which is identical to 1 kg m − 1 s − 1 . The physical unit for dynamic viscosity in the centimeter gram second system of units (cgs) is the poise (P), named after Jean Poiseuille. ... 1 centipoise = 1 mPa s.
What are the factors that affects viscosity?
Viscosity is influenced by the composition of the crude oil, the temperature, dissolved gas content, and the pressure . As temperature increases, the viscosity will decrease. As a result, viscosity measurements are always reported with the temperature at which the measurement is made.
What causes thixotropy?
Thixotropy arises because particles or structured solutes require time to organize . ... Some fluids are anti-thixotropic: constant shear stress for a time causes an increase in viscosity or even solidification. Fluids which exhibit this property are sometimes called rheopectic.
How does a Stabinger viscometer work?
A measuring rotor with a built-in magnet floats freely in the sample. The sample’s shear forces drive the rotor while magnetic effects retard its rotation. Shortly after the measurement start, the rotor reaches equilibrium speed. This speed is a measure of the fluid’s viscosity.
How is viscosity calculated?
There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v) , where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.
What is viscosity and its types?
Viscosity is a measure of a fluids propensity to flow. There are two kinds of viscosity commonly reported, kinematic and dynamic . Dynamic viscosity is the relationship between the shear stress and the shear rate in a fluid. The Kinematic viscosity is the relationship between viscous and inertial forces in a fluid.
What is viscosity class 11?
Viscosity. Viscosity refers to the resistance to the flow of liquid arising as a result of the internal friction within the layers as they pass over other layer . Viscosity arises due to the strong intermolecular forces between the molecules that holds them together and resist the passing of layers over other.
What is the SI unit of viscosity poiseuille?
Pascal-second (symbol: Pa·s) This is the SI unit of viscosity, equivalent to newton-second per square metre (N·s m–2). It is sometimes referred to as the “poiseuille” (Pl). One poise is exactly 0.1 Pa·s. One poiseuille is 10 poise or 1000 cP, while 1 cP = 1 mPa·s (one millipascal-second).
What is the SI unit of viscosity * 1 point?
The SI unit for dynamic viscosity η is the Pascal-second (Pa-s) , which corresponds to the force (N) per unit area (m 2 ) divided by the rate of shear (s – 1 ). Just as in the definition of viscosity!
What is the SI unit of input?
In the International System of Units (SI), the unit of power is the watt (W) , which is equal to one joule per second.
What are 3 factors that affect viscosity?
The viscosity of liquids generally depends upon the size, shape and chemical nature of their molecules . It is greater with larger than with smaller molecules; with elongated than with spherical molecules.
What are the two major factors that affect viscosity Brainly?
Temperature, pressure (at very high value) and concentration are the factors on which viscosity of a fluid depends.
