The Numerical Simulation of Bubble Dynamic on Inclined Plates with Hybrid Front Tracking Method under Microgravity Condition

In this paper, the hybrid front tracing method is used to simulate the rising of a single bubble in a quiescent liquid. This method is a new approach to capture of fluid interfaces in the constant grid and using a one field concept. A one field approximation is used, where one set of governing equations are only solved in the entire domain and different phases are treated as one fluid with variable physical properties. The interfacial effects are accounted for by adding appropriate source terms to the governing equations. The related unsteady incompressible full Naiver-Stokes equations were solved using a conventional finite volume method with a structured staggered grid. The interface was tracked explicitly in to connected marker points via hybrid front capturing and tracking method. A computer program was developed for numerical simulation of bubble movement in a viscous liquid in different gravity conditions, especially zero gravity conditions have been used. In addition to general studies of microgravity effects, the initiation of hydrodynamic Marangoni convection solely due to the variations of interface curvature (surface tension force) and thus generation of shearing forces at the interfaces was also studied. Recognizing this movement in the study of bubble dynamics problems, especially in the nucleate pool boiling in zero gravity is important. In this regard, the simulation results were obtained for different conditions and the role of the hydrodynamic Marangoni convection on bubble movement in the absence of buoyancy force was investigated in the obtained results. The simulation results on the inclined plate show that bubble behavior in according to a critical angle from sliding on the wall to departure from wall and finally fluctuate departure have a good agreement with experimental results.