DYNAMICS AND KINEMATICS OF MOVEMENT OF THE MENISCUS OF LIQUID IN THE CAPILLARY

E. Bibik
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Abstract

The role of capillary pressure as a factor determining the dynamics and kinematics of the capillary flow is considered. The observed axial flow is considered as a consequence of the radial flow of the fluid bordering the surface of the meniscus. It is shown that the radial flow is due to the gradient of the superficial tension of the meniscus caused by the deformation of the meniscus surface by the forces of fluid adhesion to the capillary wall. An estimate of current velocities is given. Under typical conditions, the velocity of the radial flow is by a factor of ten greater than the flow velocity along the capillary axis when the volume velocities calculated from the values of the tension gradient and the capillary pressure, respectively, are equal. It is concluded that the observed movement of the meniscus is caused by the flow of fluid on the surface of the capillary, in which the axial component of the flow rate on the capillary wall is zero. This eliminates the contradiction between the apparent movement of the meniscus and the equation of the axial flow of fluid in the capillary, according to which the speed on the wall should be zero
毛细管中液体半月板运动的动力学和运动学
考虑了毛细管压力作为决定毛细管流动动力学和运动学的一个因素的作用。观察到的轴向流动被认为是半月板表面附近流体径向流动的结果。结果表明,径向流动是由于液体黏附于毛细管壁的力使半月板表面变形而引起的半月板表面张力梯度引起的。给出了流速的估计。在典型情况下,当分别由张力梯度和毛管压力计算的体积速度相等时,径向流动速度比沿毛管轴的流速大十倍。由此得出结论:观察到的半月板运动是由毛细管表面的流体流动引起的,其中毛细管壁上流速的轴向分量为零。这消除了半月板的明显运动与毛细管中流体轴向流动方程之间的矛盾,根据该方程,壁上的速度应该为零
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