![]() ![]() ![]() If the viscosity is very high, for instance in pitch, the fluid will appear to be a solid in the short term. where v kinematic viscosity, dynamic viscosity, p density. Otherwise all fluids have positive viscosity. The Saybolt Viscometer consists essentially of a cylin- drical brass cup in the bottom of which is an orifice of speci-. The kinematic viscosity equation is: v/p. ![]() Zero viscosity is observed only at very low temperatures, in superfluids. A fluid that has no resistance to shear stress is known as an ideal fluid or inviscid fluid. A liquid's viscosity depends on the size and shape of its particles and the attractions between the particles. For the same velocity pattern, the stress required is proportional to the fluid's viscosity. When the fluid is forced through a tube, the fluid generally moves faster near the axis and very slowly near the walls therefore, some stress is needed to overcome the friction between layers and keep the fluid moving. Measurements of absolute viscosity are conducted for the purposes of research for various fluids, including oils, for quality control, and to analyze the characteristics of grease for lubricating machinery. Viscosity is due to the friction between neighboring particles in a fluid that are moving at different velocities. Kinematic viscosity is calculated by dividing the absolute number by the density of the fluid. This method of determining viscosity was. The kinematic viscosity ( nu) is the dynamic viscosity of the medium divided by its density. The viscosity index is not defined and shall not be reported for oils with kinematic viscosity of less than. For example, honey has a much higher viscosity than water. The kinematic viscosity can be converted to dynamic (absolute) viscosity by multiplying by the density of the fluid. For liquids, it corresponds to the informal notion of "thickness". Viscosity The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |