On the burning of gas in a bubble | |
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( Volume 1 Issue 2,August 2015 ) OPEN ACCESS | |
Author(s): | |
Voronin D.V. | |
Abstract: | |
The problem on dynamics of hot gas bubble in a cold liquid was numerically solved. The model is based on two-dimensional laws of conservation for mass, pulse and energy in case of axial symmetry. The effects of gas turbulence were considered in the model as well. Processes of viscosity, heat conductivity, diffusion of substance, evaporation of a liquid on interface border were taken into account in the paper. The gas in a bubble is assumed to be compressible. The heat flux from the bubble into surrounding cold water was described in the model. The formulated problem with the stated boundary conditions was solved numerically by method of individual particles , which is updating of a method Harlow of particles in cells. The non-uniform numerical grid with a condensation near to an axis of symmetry was used. The computation algorithm provided a condensation of the grid in areas with the large gradients of parameters. Number of particles in cells is variable. The numerical algorithm provides an opportunity of association and splitting of individual particles belonging to the same body, depending on the current parameters of the medium. The maximal number of particles in a cell is equal to seven. The non-stationary fields of the basic thermodynamic parameters of gas within a bubble have been computed. It was found, that the pressure of gas in the bubble has the expressed tendency to recession, though at the initial moments of time its short-term increase is possible. |
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