The variation of fouling resistance and frictional resistance coefficient of heat exchanger using connate Yangtze River water as cooling water is tested experimentally.

通过实验方法测试了以原生长江水为冷却水的换热器污垢热阻和摩阻系数的变化。

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The standard value of ventilation resistance and coefficient of frictional resistance is very significant to the ventilation management of the mine as the basic data.

标准风阻值和标准摩擦阻力系数值作为矿井通风技术管理的基本资料对矿井通风管理具有重要意义。

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The model of laminar flow in tubes in rolling motion is established. The dimensionless correlation of velocity is derived, and the correlation of frictional resistance coefficient is also obtained.

建立了摇摆条件下圆管内的层流流动模型，推导出无量纲化的速度表达式，得到摩擦阻力系数关系式。

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