Last Updated
：2025/11/20
Reynolds number
Noun
Japanese Meaning
レイノルズ数とは、流体力学における無次元数で、粘性流体の流れの特性（層流か乱流かなど）を決定するパラメータです。特に管内流においては、値が約2,000未満で層流、約3,000以上で乱流、これらの間は不安定な挙動を示すとされています。
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(physics) A dimensionless parameter that determines the behavior of viscous flow patterns. In pipe flow a value less than about 2,000 (known as the critical Reynolds number) produces laminar flow, one above about 3,000 produces turbulent flow (intermediate values produce unpredictable behavior).
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Reynolds number
When designing the pipeline, engineers checked the Reynolds number to ensure the flow remained laminar under expected operating conditions.
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When designing the pipeline, engineers checked the Reynolds number to ensure the flow remained laminar under expected operating conditions.
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