Compared to other methodologies, it’s a more complex measurement. This is otherwise known as microrheology. The energy loss in the resonating frequency is directly proportional to the viscosity of the fluid being tested. Some amounts of energy will be dissipated. You can apply oscillations to the sample and then measure the resonance. Subjecting a sample fluid to motion in order to measure the viscosity as it moves can also be done through vibrations. You must know the fluid’s density and the exact diameter of the tubes. This method is used to measure the kinematic viscosity of a fluid. The viscosity can be calculated based on the time it takes for the fluid to flow through the tubes. Fluid flows into the tube with the aid of capillary action. Here are five measurement methods that you can use:Īlso known as capillary viscometers, these are vertical U-shaped tubes with a narrow passageway for the fluid. Choosing which one to use will depend on the type of fluid and your purpose of measuring. Various types of techniques and instruments can be used to measure either the dynamic (absolute) or the kinematic viscosity of a fluid. For example, the IUPAC standard conditions for liquids and gases are defined as: 273.15 K (0 ☌) and 100 kPa (roughly 1 atm). The conventional or standard temperature and pressure, however, may actually vary they’ll depend on what you want to measure and the international convention that you want to use. Therefore, viscosity is technically a measure of the speed of the flow of fluids under a given set of standard conditions.Įxternal factors, such as pressure and temperature, must be maintained at a constant to have an accurate and standardised measurement of viscosity. Since the resistance force of the fluid cannot easily be measured in a direct manner, flow rate can be used as a surrogate. Viscosity is the resistance of fluids to flow or deform at a given rate. The unit of measure for kinematic viscosity is square metre per second (m 2/s) The measurement is dependent on the density of a fluid. It’s basically how a fluid resists the pull of gravity. Kinematic viscosity : This is measured against the force of gravity. The unit of measure for absolute viscosity is millipascal seconds (mPa-s). It’s the ratio between the shear stress applied and the area of the sample fluid.
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