Cycle water should be fresh and there is no sediment in the tube.

必须确保循环水必须是清洁的，而且管子中没有沉积物。

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The flow with sediment trapped by the slit of the vortex tube can form vortex inside the tube and exclude efficiently the coarse sediment near the bed layer in front of the tube.

进入涡管槽口的挟沙水流会形成强有力的螺旋流沿涡管流动，能有效地排除底部推移质泥沙。

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