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. [1] Viscometers can measure only constant viscosity, that is, viscosity that does not change with flow conditions.

Viscometry or viscosity method was one of the first methods used for determining the MW of polymers. In this method, the viscosity of polymer solution is measured, and the simplest method used is capillary viscometry by using the Ubbelohde U-tube viscometer.

The specific field of viscometry covers ideally viscous fluids, and – considering certain restrictions – also viscoelastic liquids, i.e. viscous fluids that contain an elastic portion. Fluids which flow easily show a low resistance to deformation.

Find Viscosity-related information at AMETEK Brookfield Customer Learning Center. OVERVIEW Viscosity is a principal parameter when any flow measurements of fluids, such as liquids, semi-solids, gases and even solids are made.

c) Falling Ball viscometer. Capillary Viscometer. The most common viscometer among the few other capillary tube viscometer is the Ostwald viscometer, measuring the flow of the liquid through the tube.

Aug 28, 2022 · The equation governing this type of viscometry is the Pouisille law (Equation \ref{5} ), where Q is the overall flowrate, ΔP, the pressure difference, a, the internal radius of the tube, η, the dynamic viscosity, and l the path length of the fluid.

Rotational Viscometers. This type of viscometer is the most suitable for evaluating Non-Newtonian fluids. ‎ The rotational viscometer comprises a spindle, rotated by a motor while immersed in the sample fluid, whose viscosity is to be determined.

May 5, 2023 · Zambrano et al. compared viscosity measurements using vibration viscometry and a falling body viscometer to obtain reliable fluid viscosity measurements under high-pressure conditions. For decades, many surveys have been done in viscosity measurement.

Apr 4, 2020 · Viscometry is the experimental determination of the viscosity of liquids and gases with so-called viscometers. Definition of viscosity (Newton’s law of fluid friction) Viscosity describes the internal resistance to flow of a fluid (internal friction).

Nov 19, 2024 · Viscometers are essential tools in laboratories, enabling precise viscosity measurement to ensure product quality and process efficiency. By understanding viscometry principles and selecting the right instrument, laboratories can achieve consistent and reliable results across various industries.