水力直径hydraulic diameter是在管内流动internal pipe flow中引入的其目的是为了给非圆管流动取一个合适的特征长度来计算其雷诺数 四倍的湿横截面面积与湿圆周长度之商
流量系数随矩形节流槽截面深宽比增大而增大，并随截面水力直径增大而有所增大。
The Cd increased with the depth-width ratio of notch cross-section, and increased to some extent with the hydraulic diameter of notch cross-section.
对影响同一柱体直径浑水水力分离清水装置分离性能的因素进行了试验研究。
This paper carried on experimental a research of the factor which influences the same column diameter of the turbid water hydraulic power separation device.
两相流流型分类的直观物理几何意义在于气泡空间尺度（相对于流道水力学当量直径）及其分布。
The flow regime of two-phase flow is straightly and physically charaterized by the size of gas bubbles relating to pipe diameter and the distribution of gas bubbles.
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