Reynolds number

The Reynolds number (Re) is used to predict how liquids flow under different conditions. At low Re, liquids flow by “laminar” (sheet-like) while at high Re, liquid flows become turbulent. The Reynolds number has wide applications, ranging from liquid flow in a pipe to the passage of air over an aircraft wing. It is used to predict the transition from laminar to turbulent flow, and is used in the scaling of similar but different-sized flow situations, such as between an aircraft model in a wind tunnel and the full size version.

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