なぜ円形の管の圧力損失は最も低いのでしょうか？！
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パイプが円形に近いほど、単位圧損は低くなる。 では、なぜ円形のパイプの圧力損失が最も低いのでしょうか？
1、同じ周長なら円の面積が最大 2、摩擦係数は比較的小さい
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