Reynolds number - Reynolds number
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When an object of representative length L (for example, the diameter of a sphere) is in a flow with viscosity μ, density ρ, and velocity U, the Reynolds number R is defined as R = ρUL/μ. The Reynolds number is extremely important in characterizing flows. When the Reynolds number is small, the flow is orderly (laminar flow), but when the Reynolds number exceeds a critical value (called the critical Reynolds number), the flow transitions to an irregularly fluctuating turbulent flow. Source : Heibonsha Encyclopedia About MyPedia Information |
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代表的長さLの物体（たとえば球ならば直径）が粘性率μ，密度ρ，速度Uの流れの中にあるとき，レーノルズ数Rは，R＝ρUL/μで定義される。レーノルズ数は流れを特徴づけるうえできわめて重要。レーノルズ数が小さい間は整然とした流れ（層流）だが，レーノルズ数が臨界値（臨界レーノルズ数という）を超えると，不規則に変動する乱流に遷移する。
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