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	Modeling the Effects of Cavitation in Pumps Zima, Patrik ; Sedlář, M. ; Maršík, František Results of numerical modeling of erosion damage caused by cavitation bubbles on the blade surface of a water pump impeller. Comparison with a picture of real cavitation damage on the pump after long operation. Detailed record
	Some possibilities of analytical description of strong non-adiabatic gas compression Bayer, Zdeněk Paper deals with modelling of the gas state- and thermodynamic behaviour in cavitation bubbles. After recent presentation of model M3 based on the more realistic idea of the heat transfer in the course of bubble compression, introduces its advanced version M4. The comparison of the polytropic and M4 model of process shows the results for high volume compression ratios may differ in tenths of percent. In a like range lies the discrepancy caused by using more accurate state equation and temperature dependence of the heat capacity. Detailed record
	Numerical investigation of flow phenomena in radial-flow pump at low NPSH value Sedlář, M. ; Maršík, František ; Šafařík, Pavel ; Zima, Patrik Cavitating flow in the impeller of a single-stage radial-flow pump at optimal flow rate and different values of NPSH (Net Positive Suction Head) is analyzed numerically using the VOF model of CFX-TASCflow. The size and the shape of the cavitation regions near NPSH3 agree well with the cavitation visualization inside the impeller at similar flow conditions. Detailed record
	Bubble nucleation, preliminary cavitation experiments in water and mass transport modeling in the Rayleigh-Plesset equation Zima, Patrik ; Maršík, František Theoretical and experimental results validating the modified bubble nucleation theory. Detailed record
	Abrasive and cavitation deterioration of thin layers of EUCOR ceramics Pešlová, F. ; Janíček, P. ; Filípek, J. ; Fuis, Vladimír The authors present the results of measuring the abrasive and cavitation deterioration of EUCOR ceramics plasmatic coating. Three methods were used for determination of the resistance against abrasive deterioration: method of rotating sample in rotating abrasive, method of abrasive cloth and method of rotating sample in rotating abrasive in cylindrical grinding container. Detailed record
	Some remarks on collapse-models of cavitation bubbles Bayer, Zdeněk The paper refers to the Rayleighs models of cavitation bubble dynamics. For the latter one the influence of the state of water, water vapor, air and of theirs physical properties as well as their constants is checked up. Detailed record
	The effects of mass transfer in Rayleigh-Plesset bubble dynamics and cavitation modeling in a convergent-divergent nozzle Zima, Patrik ; Maršík, František The paper studies the relative importance of the mass transfer term in the modified R-P equation and proposes an experimental cavitation modeling design based on a convergent-divergent nozzle. Detailed record
	Dynamics of a bubble in variable pressure and temperature fields of a liquid Zima, Patrik ; Maršík, František A study of nucleation and growth of bubbles in a liquid by means of a method based on the nucleation pulse in a shock tube is proposed. The nucleation of bubbles in the shock tube is initiated by a sudden depressurization due to the expansion of the liquid. It is assumed that the nucleation is homogeneous and the nucleation rate and the growth of bubbles can be evaluated using the light scattering method. Description of the experimental setup and analytical solution of the expansion of water in a shock tube are given. The theory of radial dynamics of a spherical vapor/gas bubble in a liquid is then employed in the form of the Rayleigh-Plesset equation and some aspects of inertially controlled bubble growth are discussed. The governing equation and conditions for mass transfer across the bubble boundary due to diffusion of the contaminant gas are given. Detailed record
	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. Detailed record
	Modelling of cavitated flows in hydraulic machinery using viscous flow computation and bubble dynamics model Sedlář, M. ; Maršík, František ; Šafařík, Pavel Numerical solution of the 3D Reynolds averaged Navier-Stokes equation is based on FEM. The turbulence is modelled through the high Reynolds number k-epsilon model. The cavitation region is modelled as a region of the lower density . The local radius of cavitating bubbles is obtained as a solution of Rayleigh-Plesset equation. The flow past the blades of an axial flow mixer is calculated. Detailed record

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