雷诺数
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定义
一个无量纲量，用于预测流体流动是层流还是湍流，定义为Re = ρvL/μ（密度 × 速度 × 特征长度 / 动力粘度）。
解释
Developed by Osborne Reynolds in 1883, it remains a cornerstone of fluid dynamics. Flow with Re below ~2,300 in a pipe is typically laminar and smooth; above ~4,000, it becomes turbulent and chaotic. Engineers use it to scale wind tunnel models: a small model at high velocity can replicate the same flow behavior as a full-sized aircraft.
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