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Spatial vapour density measurements inside laser induced cavitation bubbles
Hošek, Jan ; Garen, W. ; Shönig, H.
Cavitation bubbles have been studied and reported as an undesirable side effect in many of the medical application used of laser ablation like eye or cardio surgery in recent years. Our intention was to gain a physical information about processes inside the cavitation bubble. We develop a new technique for direct gas/vapour property measurements during the cavitation process in the bubble based on determination of bubble gas density.
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Analysis and development of comparatively simple algebraic equations of state
Bayer, Zdeněk
The survey of until now analysis of various types of simple equations of state (EOS) is given. A method was developed and used for consecutive testing of algebraic EOS, EOS with terms with fractional exponents, EOS with exponential and also theirs combination. Several new two-and three-constant cubic EOS of the van der Waals type was shown that should be more universal than the other EOS.
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Nucleation and dynamics of bubbles in binary water-gas solution
Zima, Patrik ; Maršík, František
The paper deals with nucleation and dynamics of bubbles in water with dissolved contaminant gas. The nucleation model assumes binary solution of water and pure gas. Some attention is paid to the study of the effect of the dissolved gas on the onset of nucleation (cavitation). In addition, the presence of the gas component is reflected in the Rayleigh-Plesset equation, which describes the subsequent growth (and dynamics) of a bubble in a liquid. The derived equation for bubble radius assumes mass transfer across the bubble boundary, which is in the contrary to the previous and widely used assumptions of boundary impermeability and which appears to provide more realistic insights into bubble behavior. The effect of mass transfer across the bubble boundary is studied analytically and numerically. The natural frequency of the bubble is also shown for the studied problem.
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