Reynolds number is a dimensionless number that can be used to characterize fluid flow conditions. Re= ρ VD/ μ， Among them, v ρ、μ They are the flow velocity, density, and viscosity coefficient of the fluid, with d being a characteristic length. For example, if fluid flows through a circular pipeline, d is the equivalent diameter of the pipeline. The Reynolds number can be used to distinguish whether the flow of a fluid is laminar or turbulent, and can also be used to determine the resistance that an object experiences when flowing in a fluid.

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