Bubble Motion Properties At The Liquid-liquid Interface Of Immiscible Fluids

Oxygen-enriched bottom blowing smelting is a typical multiphase flow phenomenon,and the amount of flue gas generated during the smelting process has a very important effect on the slag layer and matte layer.Therefore,this paper takes the bubble as the research object,and in-depth study of bubble size,initial shape,rising trajectory,bubble and bubble interaction,bubble and liquid interaction on the fluid flow behavior.According to the smelting situation of oxygen-enriched bottom blowing furnace,a mathematical model of the bubble movement process in immiscible fluid is established,and an experimental platform is built to conduct experimental verification on the established model.Firstly,the volume of fluid method(VOF)is used to numerically simulate the free rising process of a single bubble in a static stratified liquid.The results show that when the initial height of the bubble is the same,the rising speed,deformation degree and mass transfer effect of the bubble increase with the increase of the bubble radius.When the maximum vortex intensity is mainly concentrated on the top of the bubble,above the left and right sides,and below the left and right sides,the bubble shapes are spherical,elliptical,and spherical cap-shaped,respectively.Under the condition of the same radius and different initial height,the shape,motion behavior and internal vortex distribution of the bubble are the same.However,due to the different initial heights,the trajectories of bubbles are linear,spiral and C-type,respectively,and the relationship between the aspect ratio of the bubbles of different radius and the height of the liquid carrying the lower layer is predicted.Secondly,simulate the rising process of double bubbles/random multiple bubbles in static immiscible fluids.The results show that when the radius of two bubbles is the same(3mm)and the spacing is different,the smaller the spacing is,the smaller the bubble rising velocity is.The larger the spacing,the longer it takes for the bubble to completely separate from the lower liquid;and when the spacing is 1/2R,the vortex intensity inside the bubble is the largest.When the spacing between the two bubbles is the same(1/2R)and the radius is different,the two bubbles with a radius of 1mm fuse,and the two bubbles with a radius of 3mm rise in a "V" shape,double bubbles with a radius of 5 mm rise first in a "V" shape,then against the wall,and finally in a “inverse V” shape.As the radius of the bubble increases,the vortex intensity inside the bubble also increases.MATLAB programming was used to generate ten bubbles of random size and coordinates for the study of random multiple bubble motion in immiscible fluids.