Incipient motion of solid grain in solid-liquid two \ | phase flow is often concerned in many petroleum technologies, such as horizontal drilling, gravel-packing and sand washing.

水平井钻井、砾石充填及冲砂等作业都涉及到固液两相流动的固体颗粒起动问题。

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When flow velocity decreases below the corresponding incipient motion condition, no sediment movement occurs.

当水流速度小于相应的起始运动时，将无泥沙运动。

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Test results show:for the same grain size groups the flow velocity relating incipient motion of these granite sand grains decreases as the bed slope increases;

实验结果表明，同一粒径组的非粘性花岗岩风化砂粒随底坡坡度的增加其起动流速变小；

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Test results show:for the same grain size groups the flow velocity relating incipient motion of these granite sand grains decreases as the bed slope increases;

实验结果表明，同一粒径组的非粘性花岗岩风化砂粒随底坡坡度的增加其起动流速变小；

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