This document discusses different types of viscometers used to measure viscosity. It defines viscosity and explains that viscometers measure it under various flow conditions. The main types described are rotational, vibrational, oscillation, falling piston, falling sphere, and Saybolt viscometers. Rotational viscometers measure viscosity under different conditions for Newtonian and non-Newtonian fluids. Vibrational viscometers continuously measure viscosity in pipes and tanks, while oscillation viscometers adapt laboratory and high-pressure/temperature measurements. Falling piston viscometers use a piston-cylinder assembly to draw fluid through a gap. Falling sphere and Saybolt viscometers also measure viscosity based on fluid flow properties.

1. Viscometer

2. CONTENTS
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Viscosity
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Viscometer
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Types of viscometer

3. Viscosity
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The device used for measurement of viscosity is known
as viscometer .
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The viscosity of a fluid is a measure of its resistance to gradual
deformation by shear stress or tensile stress.
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The units of viscosity is poise and centipoise .
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specific viscosity is the ratio of the viscosity of fluid to the
viscosity of water at 20 degree Celsius. Since the water has a
viscosity of 1 cp at 20 degree Celsius.
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Kinematic viscosity is defined as ratio of dynamic viscosity to
the density of the fluid.

4. Viscometer
What Is Viscometer?
A Viscometer is an instrument used to measure the
viscosity of a fluid.
It is also known as Viscosimeter.
For liquids with viscosities which vary with flow
conditions, an instrument called a rheometer is used.
Viscometers only measure under one flow condition.

5. Types of Viscometer
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Rotational Viscometer
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Vibrational Viscometer
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Oscillation Viscometer
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Falling Piston Viscometers
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Falling Sphere Viscometer
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Saybolt Viscometer

6. Rotational Viscometer
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Rotational viscometer gathers data on a material’s
viscosity behavior under different conditions.
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Rotational viscometers can be used for the accurate
measurement of viscosity for both Newtonian and
non-Newtonian fluids.

7. Fig: Rotational Viscometer

8. Vibrational Viscometer
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A Vibrational Viscometer is used for continuous direct
measurement of viscosity in pipes and/or tanks.
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Vibratory Viscometers are better suited to measure
non-newtonian liquids.

9. Fig: Vibrational Viscometer

10. Oscillation Viscometer
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The oscillating piston viscometer technology has
been adapted for small sample viscosity and micro-
sample viscosity testing in laboratory applications.
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It has also been adapted to measure high pressure
viscosity and high temperature viscosity
measurements in both laboratory and process
environments.

11. Fig: Oscillation Viscometer

12. Falling Piston Viscometers
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The principle of viscosity measurement in this rugged and
sensitive industrial device is based on a piston and cylinder
assembly.
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The piston is periodically raised by an air lifting
mechanism, drawing the material being measured down
through the clearance (gap) between the piston and the
wall of the cylinder into the space which is formed below
the piston as it is raised.

13. Fig: Falling Piston Viscometer

14. Falling Sphere Viscometer
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The falling ball viscometer is based on Stokes’ Law.
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This type of viscometer consists of a circular cylinder
filled by the liquid under investigation.
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A standard ball is allowed to fall down this tube over a
calibrated distance of 100 mm.
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Stokes' law can be used to calculate the viscosity of the fluid.
A series of steel ball bearings of different diameter are
normally used in the classic experiment to improve the
accuracy of the calculation.

15. Fig:Falling Sphere Viscometer

16. Saybolt Viscometer
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A device used to measure the viscosity of a fluid. The saybolt
viscometer controls the heat of the fluid and the viscosity is
the time is takes the fluid to fill a container.
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Efflux cup viscometers are most commonly used for fieldwork
to measure the viscosity of oils, syrups, varnish, paints and
Bitumen emulsions.
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The saybolt viscometer, one of the efflux cup viscometers is
the standard instrument for testing petroleum products.
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The testing procedure is quite similar to the capillary-tube
viscometers

19. Prepared By:
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Darshan Talsaniya - 140570119108
•
Jagrut Joshi - 140570119044
•
Jatin Mandaliya - 140570119065
•
Nevil Gambhava - 140570119029

20. Thank you