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中文摘要：
在微隧道的流动的三个维的洞的旋涡的性质，很重要，数字地被调查。结果证明在洞的旋涡的旋转方向取决于洞以及液体的粘性的尺寸和形状。与修理的洞的尺寸和形状，在那里存在批评入口速度。入口速度是什么时候不到临界数值，在洞的旋涡的旋转方向将变化。临界速度与液体的粘性直接成正比，并且与洞的厚度，长度和深度的平方相反地成正比。为长度的比率和到一个的洞平等者的深度，当 Re 是不到 Re_(cr ) 时，有批评尺寸更少 parameterRe_(cr ) ，旋涡的旋转方向也将变化， Re_(cr ) 近似等于 11.8。
英文摘要：
The vortical property in a three dimensional cavity of micro-channel flow, which is very important, was investigated numerically. The results show that the rotation direction of vortex in the cavity depends on the dimension and shape of the cavity as well as the viscosity of the fluid. With the dimension and shape of the cavity fixed, there exists a critical inlet velocity. When the inlet velocity is less than the critical value, the rotation direction of vortex in the cavity will change. The critical velocity is directly proportional to the vis- cosity of the fluid, and inversely proportional to square of the thickness, length and depth of cavity. For the ratio of length and depth of cavity equals to one, there is a critical dimensionless parameter Recr , when Recr＇ is less than Recr＇ , the rotation direction of vortex will change too. Recr＇ is equal to 11.8 approximately.
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