Motion And Optical Properties Of Single Bubble

In fluid,the motion form and dynamic characteristics of bubbles are an important subject in many disciplines such as fluid mechanics,environmental engineering and ship engineering.By studying the mechanism of bubble movement and the light scattering characteristics of bubbles,the basic problems of gas-liquid two-phase flow are explored,which provides a research basis for particle and bubble adsorption,jacking phenomenon in environmental engineering and the reduction of navigation resistance through bubbles in ocean-going ships.In this paper,the development of bubble dynamics at home and abroad in recent years is reviewed from the perspectives of theoretical analysis and numerical simulation.In theoretical analysis,the equation of motion of a single bubble is established.By studying the light scattering properties of single bubbles,the Mie scattering theory is applied to the light scattering of bubbles;first,the light scattering,especially the Mie scattering,is theoretically studied,and then the optical scattering model of a single bubble is simulated by computer.The light scattering properties are closely related to bubble diameter and relative refractive index.In addition,using the Mie scattering principle,the scattering characteristics of fine particles in the medium are analyzed in relation to their particle size and relative refractive index.In scattered light detection,the scattered energy of bubbles is measured to obtain the regularity of its distribution.By studying the characteristics of bubble generation and rising movement in liquid,the influence of bubble generation in water under different pore diameters and gas flow rates was obtained,the size of bubbles when they were detached and the time it took to generate were calculated,and the movement of bubbles under different experimental conditions was obtained.speed and trajectory.The test results show that: under the same conditions,the size of the generated bubble increases with the increase of the inner diameter of the pore and the gas flow rate,and the rising speed of the bubble is not a fixed value,but fluctuates around a certain speed;With the increase of,its motion trajectory gradually changes from a "Z" shape to an irregular curve;the viscosity and surface tension of the external fluid have a great influence on the formation and movement of bubbles.The main manifestations are that the higher the viscosity of the liquid phase,the lower the rising speed of the bubbles,the closer the movement trajectory is to a straight line,the greater the surface tension of the liquid phase,the larger the volume of the generated bubbles,and the longer the detachment time.