Research And Analysis Of A Spherical Particle Rising In The Liquid

Solid-liquid phase problems exist widely in nature as well as in engineering and technical fields.Just like the river and sea with silt,hydraulic handling and air conveying are widely used in the motion,chemical,mining,building engineering and so on,ore pulp,paper pulp,and colloid pulp's moving.The research on solid-liquid two phase flow is of great importance in our understanding of nature and in engineering technology.In this thesis,the behavior of the particle during rising process in a solution have been theoretically and experimentally studied,including measuring and analyzing the vertical and horizontal velocities and spin angle of the particle and summarizing the characteristics of motion of the particle.Theoretical model was established based on the analysis of previous researchers.And then the result was theoretically analyzed.In the research on the whole moving of the particle, photographic process of the experimental method was carried out,took a photograph of the particle in the whole process,observed and recorded the movement trajectories of the particle, and then analyzed the movement trajectories by the use of computer image processing techniques.After improving the experimental method,the accuracy of the result was greatly improved.The results show that the spherical particle acts a sinuous helical rising trajectory in the solution accompanied with wobbling rotation,which indicates that,in the case of different velocities of solid-liquid two phases,it's unaccepted to neglect the transverse force and movement of the solid particle while describing its movement.By the experiment of the different small wooden balls,it is found that both the vertical and horizontal velocities of different wooden balls reach stable maxima in a short time after the wooden ball begins rising, and keeps rising with this maxima.This agrees well with the theoretical analysis in the paper. These experiments obtained the value of Magnus force directly by measuring the vertical and horizontal and spin angle velocity of different wooden balls at the stable stage.