内管自转及公转对非牛顿流体在偏心环空中流动的影响规律研究

Research on Influence of Rotation and Revolution of the Inner Tube on Non-Newtonian Fluid Flow in Eccentric Annulus

应用非牛顿流体在内管自转且公转的环空中流动的数学模型,对仅有内管自转的偏心环空螺旋流和流体在内管自转且公转的环空中的流动分别进行了模拟计算。结果表明:内管公转使流体周向运动区域更大,流体有阻止内管公转并将内管向环空内侧推回的趋势,环空内湍流高粘度区发生与内管自转方向相同的旋转偏移,内管自转与公转转向相反会使得流体周向速度受到削弱并形成涡流,二次流区域将变大。

The mathematical model of non-Newtonian fluid flow in the annulus whose inner tube rotates and revolves simultaneously was established. Eccentric annulus flow while inner tube only rotates and eccentric annulus flow while inner tube rotates and revolves simultaneously were simulated. The results show that： the revolution of inner tube can make fluid motion area greater, the fluid prevent the inner tube from revolving and push the inner tube back to inside of the annulus. Area of high turbulent viscosity moves rotationally at the same direction as the rotation of the inner tube. If the directions of rotation and revolution of inner tube are opposite, velocity of fluid would decrease ,and vortex would appear, the area of secondary flow would increase, too.