阻力係數(常表示為)是流體力學中的無因次量,用來表示物體在流體(例如水或是空氣)中的阻力。阻力係數會出現在阻力方程中,較小的阻力係數表示物體受到的風阻或流體阻力較小。阻力係數和物體的形狀及其表面特性有關[1]

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雷諾數為104流體中的阻力係數

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