ARBNOR EMINI LAB REPORT VISCOSITY
Lab 3 Viscosity Measurement
Arbnor Emini B1, acjz758@city.ac.uk
Abstract
The flow rates of a series of dilutions of glycerol solutions (100% glycerol and 98% glycerol concentration) were measured using a viscometer. The intrinsic viscosity of the solution was found along with other quantities such as shear stress and shear rate for example. The objective of this laboratory experiment was to measure and determine the viscosities of glycerol/water solutions using a rotational viscometer.
Introduction
Viscosity is a significant property of materials, it is a measure of the resistance to deformation under shear stress. If one were to measure a material’s resistance to a change in motion under a specific force it can show how the material will behave in real life applications. For example in petroleum, viscosity measures the effectiveness of lubricating oil also, when making concrete, it is important to know the self-levelling and pumping behaviour of the mixture.
This experiment was held in an undergraduate laboratory at City University London. This report will be presenting an experiment on viscosity measurement of glycerol – water mixtures with a Bohlin Visco 88 rotational viscometer. Rotational viscometer provide ability to measure not only the viscosity of a fluid, but also shear rate and shear stress, torque, temperature and frequency of rotation.
Theory
These quantities were measured, recorded or calculated:
Viscosity is material’s ability to resist motion or flow. It arises from collisions of molecules in a fluid that hit each other due to different velocities of molecules. It is defined as a ratio of shear stress and shear rate. Units: Pas.
Shear stress is a measure of a load on specific area, however differently from tensile stress, shear stress acts coplanar to a material cross section instead of acting perpendicular to the cross section. It is defined as force per unit area just like tensile strength and has the same units. Units: Pa.
Shear rate is
Arbnor Emini B1, acjz758@city.ac.uk
Abstract
The flow rates of a series of dilutions of glycerol solutions (100% glycerol and 98% glycerol concentration) were measured using a viscometer. The intrinsic viscosity of the solution was found along with other quantities such as shear stress and shear rate for example. The objective of this laboratory experiment was to measure and determine the viscosities of glycerol/water solutions using a rotational viscometer.
Introduction
Viscosity is a significant property of materials, it is a measure of the resistance to deformation under shear stress. If one were to measure a material’s resistance to a change in motion under a specific force it can show how the material will behave in real life applications. For example in petroleum, viscosity measures the effectiveness of lubricating oil also, when making concrete, it is important to know the self-levelling and pumping behaviour of the mixture.
This experiment was held in an undergraduate laboratory at City University London. This report will be presenting an experiment on viscosity measurement of glycerol – water mixtures with a Bohlin Visco 88 rotational viscometer. Rotational viscometer provide ability to measure not only the viscosity of a fluid, but also shear rate and shear stress, torque, temperature and frequency of rotation.
Theory
These quantities were measured, recorded or calculated:
Viscosity is material’s ability to resist motion or flow. It arises from collisions of molecules in a fluid that hit each other due to different velocities of molecules. It is defined as a ratio of shear stress and shear rate. Units: Pas.
Shear stress is a measure of a load on specific area, however differently from tensile stress, shear stress acts coplanar to a material cross section instead of acting perpendicular to the cross section. It is defined as force per unit area just like tensile strength and has the same units. Units: Pa.
Shear rate is
References: i. Symon, Keith (1971). Mechanics (Third ed.). Addison-Wesley. ISBN 0-201-07392-7.