How do you measure viscosity using a viscometer?
BACKGROUND
- Ostwald viscometer is use to determine viscosity of Newtonian fluid.
- η1 can be determine using following equation.
- η1=ʆ1t1/ ʆ2t2 X η2
- ʆ1=Density of unknown liquid.
- t1 =Time of flow of unknown liquid.
- ʆ2 =Density of standard liquid.
- t2 =Time of flow of standard liquid.
- η2=Viscosity of standard liquid.
What is the instrument used to measure viscosity?
viscometer
How do you measure the viscosity of a Brookfield viscometer?
A sample of 400 – 600ml in a suitable container is placed under the viscometer which is then lowered to dip the spindle into the sample up to an immersion mark on the spindle shaft. The dip-in spindle is suitable for comparative testing of the viscosity of free-flowing fluids.
What is the use of Brookfield viscometer?
The Brookfield Dial Reading Viscometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow.
How does a viscometer work?
The EMS viscometer measures the viscosity of liquids through observation of the rotation of a sphere driven by electromagnetic interaction: Two magnets attached to a rotor create a rotating magnetic field. The sample ③ to be measured is in a small test tube ②.
What are the types of viscometer?
6 Different Types of Viscometers & How They Work
- Orifice viscometers.
- Capillary viscometers.
- Falling piston viscometers.
- Rotational viscometers.
- Falling ball viscometers.
- Vibrational viscometers.
How is torque related to viscosity?
This is because the torque, which is typically measured with the reaction torque on the motor, correlates to the viscous drag on the immersed spindle and so the viscosity of the fluid.
How does viscosity affect speed?
To understand viscosity, one must understand laminar flow, when a gas or fluid flowing over a surface results in the molecules next to the surface having zero speed. As one gets farther from the surface, there is an increase in speed.
How do you measure viscosity?
Ways to Measure Viscosity
- Capillary Viscometer. The earliest methods for measuring viscosity were based on using capillary tubes and measuring the time it took for a volume of liquid to pass through the length of the tube.
- Zahn Cup.
- Falling Sphere Viscometer.
- Vibrational Viscometer.
- Rotational Viscometer.
What is viscous torque?
Viscous torque, the resistance that a fluid offers to rotational motion, was studied with air on a polished metallic sphere. Additional data taken with flags to increase torque suggests that for greater area, the viscous torque is actually proportional to the square of the angular velocity.
Why do we measure viscosity?
Why Should You Measure Viscosity? Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave in the real world. For example: if toothpaste does not have the correct viscosity, it can either be too difficult to pump out from the tube, or pump out too much.
What are the factors that affects viscosity?
What factors affect viscosity? Viscosity is resistance to flow. For liquids, typically the larger the intermolecular forces (IMF) the higher the viscosity. The other factors that affect viscosity are temperature and the shape of the molecule.
How is viscosity measured in liquids?
The viscosity of a liquid (see Viscosity) is measured using a viscometer, and the best viscometers are those which are able to create and control simple flow fields. Most modern viscometers are computer- or microprocessor-controlled and perform automatic calculations based on the particular geometry being used.
What is viscosity explain with example?
If I fill the same cup with water, for example, the cup will drain much more quickly. Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.
What is viscosity and its types?
Let’s define the different types of viscosity: Dynamic (absolute) viscosity: Dynamic viscosity is also known as absolute viscosity and most often relates to non-Newtonian fluids. Kinematic viscosity: Kinematic viscosity is a measure of the viscosity of a (usually Newtonian) fluid in motion.
What is another word for viscosity?
What is another word for viscosity?
| consistency | density |
|---|---|
| gumminess | stickiness |
| tackiness | texture |
| firmness | body |
| richness | solidity |
Does oil have a higher viscosity than water?
Viscosity can be defined as the term used to describe the property of a fluid which gives resistance to the motion of one layer over another adjacent layer of fluid. Density is important factor when measuring viscosity. More the density more the viscosity. So definitely oil has higher viscosity than water.
What happens if you use a higher viscosity oil?
Since thicker oils don’t transfer heat as well as thinner oils, operating temperatures will increase, too, possibly leading to accelerated chemical break down and harmful sludge and deposits.
What is an example of high viscosity?
Liquids which flow very slowly, like glycerin or honey, have high viscosities. Those like ether or gasoline which flow very readily have low viscosities. Viscosity is governed by the strength of intermolecular forces and especially by the shapes of the molecules of a liquid.