![]() MORE INFO ABOUT VISCOMETER/VISCOSITY METER On the other hand, polymeric solutions, pastes, and paints are classified as non-Newtonian, as they have non-linear behaviors, that is, the applied shear stress does not depend on the resulting deformation speed. Newtonian fluids are gases and simple liquids, including liquid metals, which obey Newton’s law of viscosity. The greater the friction, the greater the force required to cause the movement thus, materials with high viscosity require greater strength to move than those with low viscosity. Whenever a fluid is moved or physically distributed, for example when it is spread or mixed, shear occurs, which is the force necessary to move the fluid layers. This resistance is the product caused by its molecular friction. Viscosity is a physical property that determines the resistance that a fluid has to flow. In this way, viscosity is measured by the angular velocity of a moving part separated from a fixed part by the liquid. It is the most suitable for measuring the viscosity of non-Newtonian fluids. The measurement is made quickly and simplified and is widely used in paint and lubricating oil factories. With an orifice viscometer/viscosity meter (ford cup), it is possible to measure viscosity by measuring the time it takes for a quantity of fluid to flow through a hole in the bottom of a given container. It is widely used to measure Newtonian fluids with low viscosity. It is not suitable for non-Newtonian fluids as it does not allow shear stress to varying. This instrument measures the viscosity through the flow rate of the liquid, using a glass capillary. Follow the reading and understand the types of viscometer/viscosity meter and their purposes.įind out now what types of viscometer/viscosity meter exist: ![]() In this context, fruit pulps, starch suspensions, and ketchup, for example, can be included.Īccording to the purpose of the measurement and the type of fluid, a suitable viscometer must be used. Non-Newtonians have their viscosity altered according to changes in sheer speed. As an example of these liquids, we can highlight water and simple hydrocarbons. ![]() This type of fluid has a constant viscosity, regardless of the applied sheer speed. The behavior of fluids, at different shear rates, can be classified into two categories: According to Newton, viscosity is calculated through the sheer force on the area to which the fluid is subjected and the speed gradient. The sheer force of a fluid occurs due to the forces of cohesion of the liquid with the walls of the container in which it is contained and between the fluid layers themselves. Therefore, water is less viscous than oil. While water has less resistance and higher speed during dumping, oil is more resistant and has a lower speed when poured. In this context, viscosity is linked to a property of the liquid.Īs an example, we can use water and oil. Viscosity is related to the resistance of a liquid and refers to its ability to move when it is poured. WHAT IS A LIQUID’S VISCOSITY AND HOW IS IT MEASURED? ![]() However, before talking more about the viscometer and its applications, it is necessary to define what a fluid’s viscosity is. It is useful equipment in several laboratories and serves mainly to assist in the quality control of raw materials or certain products produced for industrialization. The viscometer/viscosity meter is an instrument used to measure the viscosity of a given liquid.
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