A Numerical Simulation Method Of Bubble Formation By Solving Motion Equations Of Particles

ABSTRACT:The phenomenon of bubble formation and detachment exist ubiquitous inmany industrial applications, especially in chemistry, pharmaceutical industry and energyfields. The bubble behavior affectstheheat andmasstransfer. Understanding the related laws of bubble behavior makes sense to design and optimization of industrial equipment. The deformation of bubble is a very complex process of the formation and movement of phase interface. The current main study methods of bubble behavior are experimental method and CFD method. This paper proposes a new numerical modeling method by solvingequations of motion of particles. Papers main contents include as follows.The growth and departure of bubble visualization experimental system is founded and the parameters such as bubble shape, departure frequency and departure diameters, of growth and departure of bubble in different diameter pore size and different flux conditions are taken through this experimental system, the result provide accurate data for the numerical results. Then a new numerical method of application in the growth and departure of bubble is obtained through calculating movement locus of particles, including using particle-motion theory, the bubble deformation equal to the process of motion of particles is driven by pressure. A numerical model is established based on solving equations of motion of particles. At last, with the method proposed, the growth and departure of bubble with different aperture is investigated numerically.The growth and detachment of bubble with different aperture is investigated numerically. The result of the visualization experiment shows that different driving forces cause two different detachment of bubble models, the internal pressure in growth process of bubble can be significantly influenced by the diameter pore size, which result in bubble shape and detachment model changes. Fluid pressure, gas pressure surface tension and movement resistance acting on particles of at the interfaces of gas-liquid mathematical expression are fully considered in the bubble growth model, wall contact angle algorithms is imported in the bubble growth model to get precise wall attachment bubble shape. The calculating results showed that, the gas pressure is even when using bigger pore size, the liquid pressure is the static pressure, in this case The simulation results agree well with the experimental data. The velocity distributions of phase interface are studied, they reveals the trait of bubble deformation and the impact of the necking phenomenon on bubble detachment.