Investigation of multiscale characteristics of fluid flows through the detail analysis of interfacial physical phenomena

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The following 4 points are achieved in this study.(1) Using the results of Molecular Dynamics simulation, a novel mathematical model for Dissipative Particle Dynamics simulation with coarse-grained particles was developed.(2) Drag and lift force acting on a bubble moving in 3-dimensioanl paths in surfactant aqueous solutions was modeled through the detail experiment.(3) Numerical simulation was conducted to investigate the surfactant effect on the bouncing back of two bubbles. It was shown that both Marangoni effect and surface deformation are important for a bubble to bounce back.(4) A novel shape micro channel was designed as a microbubble generation devic and bubbles of diameter were successfully generated. Through the development of a high-speed micro PIV system, we obtained the knowledge of generating smaller microbubbles. Furthermore, a channel for the surface coating bubbles with organic phase are newly designed and microbubbles with the surface coating are successfully generated.