なぜ孔板流量計のβ値が大きくなるほど、必要な直管区間が長くなるのでしょうか？
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孔板流量計の一次装置の上流にある抵抗要素が一定の場合、なぜβ値が大きくなるにつれて必要な直管部の長さが長くなるのでしょうか？
流量計自体の整流効果の違い
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