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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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Finite volume method development for solution of 2D viscous fluid flow
Zúňiga, G. ; Maršík, František ; Kozel, Karel
A two-dimensional Finite Volume Method for solving the stationary incompressible non-dimensionalized Navier-Stokes equations is developed and employed to investigate the velocity and pressure fields in a non-orthogonal grid configuration. The method is tested on NACA0012 and Double Arc Airfoils. Numerical results are compared with the experiments of IT CAS for velocity and law Reynolds number (Re = 400) to the agreement rather good.
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Coupling of the electrochemical and heart activity
Převorovská, Světlana ; Maršík, František
In the paper the numerical model of the electrochemical and mechanical heart activity which has been developed at the IT CAS is described. The generation of the cardiac action potentials and the ions transport through cardiac myocytes is modelled by the Beeler-Reuter equations. For the pressures generation in the heart the relation derived from the energy balance is used. The paper includes some results of the numerical simulation.
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