Numerical Simulation of Hydrodynamic Cavitation Bubble Dynamics in Chitosan Solution
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Abstract:
Based on equation of Gilmore, the dynamics of cavitation bubble in chitosan solution was investigated with the cavitation reactor of orifice. By numerical simulation the effect of solution concentration, solution temperature, pipeline diameter of downstream, gular diameter, inlet pressure, outlet pressure and initial bubble radius on the motion of cavitation bubble were discussed. The results showed that with the increase of concentration, the amplitude of cavitation bubble decreased, and Rmax/R0 was only 8 when the concentration was 1%. The amplitude of cavitation bubble increased when increasing of temperature and pipeline diameter of downstream, Rmax/R0 reached 215 at 60 ℃ and 335 with 100 mm pipeline diameter, respectively. Moreover, with the decreasing of gular diameter, the amplitude of cavitation bubble increased，while the gular diameter was 2 mm, and Rmax/R0 was 290. It was found that with higher inlet pressure and lower outlet pressure the amplitude of cavitation bubble increased. The investigation also indicated that smaller initial bubble radius improved the effect of cavitation in chitosan solution, and Rmax/R0 was 275 with radius of 5 μm.
