In Laminar or streamline flow, the velocity of the discharge of a liquid is low and all the layers of liquid move parallel to each other. The main types of fluid flow may include, The resistance that one part of a fluid flowing with one velocity offers to another part of a fluid flowing with different velocities is known as viscosity. Therefore, there is a velocity gradient, (dv/dx) of the flowing liquid.Įach layer of the liquid surface flowing with a higher velocity experience a retarding effect due to the internal friction of the two layers.

The velocity of the successive layers from the wall of the pipe increases and remains maximum for the central layer. A thin layer immediately in contact with the wall of the pipe remains almost stationary. When the fluid flows within the pipe, all the parts of the fluid do not move with equal velocity. Recently it was used in the determination of the molecular weight of polymers. It is also used to deal with various problems solve in fluid mechanics, especially in the paint, ink, colloids, rubber, textiles, etc. The measurement of viscosity data of fluids is important in the study of biology, chemistry, and physiology. It is defined as kinematic viscosity = viscosity coefficient (η)/ density (ρ) and expressed or calculate in the Stoke unit in the honor of the scientist Stoke. Kinematic viscosity in physics sometimes is used in engineering studies to compare the following property of the different liquids. The reciprocal of viscosity is called fluidity which measures the flowing tendency of the liquid for learning chemistry and physics. The former liquids are called high viscous liquids while the latter liquids are called low viscous liquids. The flow of some liquids is slower than the others due to this property.įor example, glycerol, ester, and oil flow slowly while water, ether, and alcohol flow rapidly on the solid surface due to viscosity. Viscosity of liquids in chemistry is the resistance to flow exhibited by fluids (liquids or gases) like glycerol, ester, oils, water, alcohol, and ether.

Nytimes news quiz july 5th 2019