Construction of ViscometerĪ viscometer is usually constructed in the shape of the English alphabet ‘U’. For this purpose, the fluids are typically made to flow through a capillary tube between two marked points and the time taken by the fluid to flow between the two points marked on the glass tube is noted with the help of a stopwatch. It typically makes use of the rate of flow of liquids through a capillary tube to determine the viscosity of the fluid. An Ostwald viscometer is also known as a capillary viscometer. Also, the viscous resistance value is inversely related to the fourth power of the radius of the tube.

The value of the viscous resistance varies directly with respect to the viscosity of the fluid and the length of the tube. As per Poiseuille’s law, in the case of the laminar flow of the fluids, the flow rate of the liquid can be denoted as the ratio of pressure difference with respect to the viscous resistance. Ostwald viscometer or viscometer is an instrument that works on the principle of Poiseuille’s law. They are also applicable while designing systems that make use of hydrodynamics and aerodynamics. Calculation of viscosity or the application of a viscometer can be observed easily in pharmaceutical, cosmetic, food processing, petrochemical, and various other industries. An Ostwald viscometer is generally preferred to measure the viscosity of Newtonian fluids or typically the fluids whose viscosity does not change with respect to the flow rate. Ostwald viscometer was named after a Baltic German chemist and philosopher, Wilhelm Ostwald. A viscometer is also known as a viscosimeter. There are a number of viscometers available in the market however, one of the most popular viscometer instruments is the Ostwald viscometer. Mathematically, viscosity can be defined as the ratio of shear stress to the velocity gradient of the fluid. Viscosity is nothing but the internal resistance of the fluids to the flow. Dilatant - also known as shear thickening - the viscosity increases with increased shear rate, such as suspensions of rice, corn starch or concentrated sugar solution.A viscometer is a measuring instrument that is mainly used to measure the viscosity and other flow-related characteristics of a fluid.Pseudoplastics - also known as shear thinning - the viscosity decreases with increased shear rate, such as blood, gelatin and clay.Rheopectic - substances where viscosity increases with duration of stress, such as some lubricants.Thixotropic - substances which are gel-like at rest but liquid when agitated, such as non-drip paints, tomato ketchup and most varieties of honey.There are several different categories and sub-categories of non-Newtonian fluids, they can be described as the following:

Non-Newtonian fluids, such as paints and ketchup, are fluids which change viscosity when a force is applied.

Newtonian fluids are generally measured with flow and dip viscosity cups. No matter how fast it is stirred or mixed, Newtonian fluids will always behave in the same manner.

Newtonian fluids, such as water and some oils, are fluids that continue to flow at a given temperature, regardless of the forces acting on it.

Viscosity Fluid Categorizationįluids are categorized as Newtonian or non-Newtonian. Due to this internal friction, energy is required to move the liquid and viscosity is the measure of the resistance to flow.

All fluids have an internal friction between molecules, which determines how well fluid flows. Viscosity is perceived as 'thickness' or resistance to pouring, but there is more to viscosity than this. Orders placed during the holiday will ship Sep.

Blast Hose, Nozzle Holders and Couplings.

Qualicoat Powder Coating Inspection Kit.

Cannon 6 v94 viscosity meter