The Study On Bubble Formation And Dynamic Behaviors Of Submerged Micro-pore

Bubble formation from submerged micro-crop is an important problem in the field of complex gas liquid two phase flow, and exists in chemistry, chemical industry, energy, aerospace and other fields. In recent years, as the work of waste water treatment, the gas-liquid two phases qualitative research process in biological hydrogen production and methanol fuel cell flow channel are gradually developed, the research of bubble formation from submerged micro-crop is attracting more and more attentions. In practical applications, bubble formation may occur in various environments, and it will have different dynamic behaviors with various boundary conditions, so it’s necessary to have the corresponding research and analysis the impacts of corresponding boundary conditions.In this paper, the research of bubble formation is carried out through the method of experiment and numerical simulation. The work and research in this paper mainly includes:(1)Building a set of experiment platform, which includes the tank and bracket, high-speed camera, mass flow controller, air compressor, connecting lines to make bubble formation visualization.(2)Changing the inlet gas flow rate according to the mass flow controller, and we can observe that bubble formation experiences single cycle, double cycle, three cycle and chaotic mechanism with the increase of inlet gas flow rate.(3)The research of bubble formation from millimeters orifice are carried out through the method of numerical simulation. On the basis of the agreement with the existing experimental results, inlet gas flow rate, the static contact angle of bubble bottom, the surface tension coefficient between gas and liquid, liquid density are changed to observe the changes of bubble dynamic behaviors in numerical simulation. Comparing and analysis calculation data, and we have a conclusion of the corresponding change rules after numerical simulations for multiple conditions.(4)The research of bubble formation from micron orifice are carried out through the same method, and the impacts of the boundary conditions are obtained, and we can have a comparison with the results of(3).This paper acts as the basis of the study of millimeter orifice bubble formation, and the effects of boundary conditions on bubble dynamic behaviors are carried out through the method of experiment and numerical simulation. At last, the numerical simulation results consistent with the relative data of bubble formation from micron orifice in existing literatures, and the impacts of various boundary conditions are concluded, which will lay the foundation of a deeper understanding of bubble formation and subsequent research work.