Reynolds Number
Reynolds number in fluid mechanics is the ratio of "force by inertia" and "force by viscosity", quantitatively indicating the relative importance of these two forces in a given flow condition. Reynolds number is one of the most important dimensionless numbers in fluid dynamics and can be used with other dimensionless numbers to determine the dynamic similarity. When two flow patterns are geometrically superior, if the major dimensionless numbers of these two flows have the same value, they say that they have dynamic similarity, and the two flows are similar in shape. The Reynolds number is also used to predict whether the flow is laminar or turbulent. Laminar flow is dominated by viscous forces, characterized by low Reynolds numbers and a flat, constant flow. Turbulence, on the other hand, is characterized by high Reynolds number, arbitrary eddin vortices, and other flow fluctuations, which are dominated by inertial forces. Reynolds number was named after Osborne Reynolds who proposed it in 1883.