While two flows with approximately equal Re can behave quite differently in practice due to their chaotic nature in which even small differences in shape and surface roughness can produce very different flows, the Reynolds number is still a useful and widely used guide to flow similarity. Edgy currents, in turn, use up energy and may produce cavitation. Turbulence also leads to edgy currents in which different sub-flows intersect or even move counter to the overall flow direction. One interprets the Reynolds number as such: a low Reynolds number suggest the flow should be dominated by laminar (sheet-like) flow at high Reynolds numbers one expects significant turbulence due to the differences in the fluid's speed and direction. At larger scale it has uses in meteorology and climatology. In practical applications the ability to predict when a turbulent flow will appear is important in designing piping systems, airplane wings, aerodynamic vehicles, including for scaling from study models to actual aircraft/vehicle. It can also be used to study and predict hot gases as in a flame in air. The number sees uses in fluid mechanics where it is used to predict flow patterns in different fluid flow scenarios. Knowing Re one can anticipate the transition from laminar to turbulent flow which is the main utility of a Reynolds Number calculator. The Reynolds number (Re) is a dimensionless quantity for dynamic similarity and is calculated as the ratio of inertial forces to viscous forces of a flow of liquid. The Reynolds Number calculator will then apply the relevant equation and produce the Reynolds Number (Re) as result. compressible gases) and fluids of variable viscosity (non-Newtonian fluids). Special consideration should be taken for fluids of variable density (e.g. the inner diameter of a pipe, the diameter of a sphere moving in liquid, or the length of a plate over which the substance is flowing. Finally, enter the characteristic length, e.g. Then enter the velocity at which the substance is moving. m 2/s, Stokes and centiStokes for kinematic viscosity, imperial and metric/scientific units for density, velocity and length).įirst, select whether you know the substance's kinematic viscosity or the dynamic viscosity and density and then enter the quantities you know. It supports a wide range of input and output measurement units (e.g. A poise (P), named after Jean Léonard Marie Poiseuille, who also derived the Poiseuille's law equation, has a value equivalent to 0.1 pascals-second (Pa⋅s).With the help of this calculator you can compute the Reynolds Number of a liquid or gas. Now that we know the difference between the two types of viscosities, let's go back to the measurement units. By determining the viscosity of fuels in terms of kinematic viscosity, we get to model the speed fuel droplets that will be sprayed out of an injection nozzle due to applied pressure. One particular use of kinematic viscosity is for fuels. On the other hand, we use kinematic viscosity to describe the speed of the fluid due to an applied force. Learn more about squeezing pressure on a container with fluids by checking out our manometer calculator. That way, it won't be either too hard to squeeze the paste out of the tube or too runny that a lot of paste comes out, even with a little squeezing pressure. ![]() When formulating the mixture of, let's say, a paste in a tube, we want the paste to have a specific dynamic viscosity. ![]() ![]() The dynamic viscosity tells us how much force is required for a fluid to move at a particular speed. Viscosity, which describes a fluid's consistency or "thickness," comes in these two types for some distinct reasons. Poise is a unit of measurement used particularly for dynamic viscosity, while stokes is for kinematic viscosity. Poise and stokes are units of measure used to quantify viscosity.
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