Viscosity, in simple terms, is a fluid’s resistance to flow. Following are the various methods used to measure the viscosity of a fluid: Capillary Viscometer- This method is based on using capillary tubes and the time it takes for a volume of liquid to pass through the length of the tube.
A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid.For liquids with viscosities which vary with flow conditions, an instrument called a rheometer is used. Thus, a rheometer can be considered as a special type of viscometer. Viscometers only measure under one flow condition.
Because molasses is more resistant to flow, it has a higher viscosity than water. While there are a number of methods from which to choose in deciding how to measure viscosity, perhaps the least complicated involves dropping a ball into a clear container of the liquid for which you are trying to determine viscosity.
There are several types of viscosity measurement devices. Viscometers measure viscosity of a fluid; this article explains how to measure viscosity. The different types of viscosity measurement devices are explained, such as portable viscosity testers, falling sphere viscometers, piston viscometers, and u tube viscometers. Rheometers are used for non-newtonian fluids.
Ways to Measure Viscosity. Way back in the 1800's, the first measurements of viscosity were made using capillary tube methods. The following is a brief summary of the different techniques and instruments that have since been developed, and are in use today.
The criticality of kinematic viscosity measurement prompted the petroleum industry to develop a very precise method, first published in 1937, ASTM D 445, Test Method for Kinematic Viscosity of Transparent and Opaque Liquids. The term “kinematic” simply means that the measurement is made while fluid is flowing under the force of gravity.
Many different types of viscometers and other viscosity measurement devices are used to measure viscosity for various types of fluids and units of measure. Here are six types of viscosity measurement devices to consider: Falling ball viscometers. A falling ball viscometer measures the viscosity of fluids and some units can also measure the ...
Viscosity Measurement 30.1 Shear Viscosity Newtonian and Non-Newtonian Fluids • Dimensions and Units of Viscosity • Viscometer Types • Capillary Viscometers • Falling Body Methods • Oscillating Method • Ultrasonic Methods 30.1Shear Viscosity An important mechanical property of ﬂuids is
There is a multitude of methods for measuring viscosity. Each method often has its own relative viscosity scale, which is good only for that particular method. For instance, two such units are Saybolt (SSU) or the Redwood scale. Viscosity can be absolute (dynamic) or kinematic.
Hence a single viscosity measurement is not sufficient to describe the viscosity of such materials and the viscosity should be measured over a range of shear rates or stresses, or at least at a shear rate relevant for the process or application of interest.