"Topical Problems of Fluid Mechanics 2014" - Výsledky hledání - Digitální repozitář

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	Numerical Simulation of Turbulent Flows Through Turbine Cascade With Rough Blades Fürst, J. ; Louda, Petr ; Příhoda, Jaromír The article deals with numerical simulation of turbulent compressible flows through 2D model of a turbine with rough blades. The mathematical model is based on the Favre-averaged Navier-Stokes equations combined with several two-equations turbulence models. The wall roughness is modeled using an appropriate boundary condition for specific dissipation rate. The comparison with experimental data shows correct increase of energy losses in the case of increased wall roughness. Úplný záznam
	Topical Problems of Fluid Mechanics 2014 Šimurda, David ; Bodnár, Tomáš The aim of the conference is to publish and to discuss the latest results of research in fluid mechanics. Úplný záznam
	Preventing microbubble conjunctions by gas flow excited by a fluidic oscillator Tesař, Václav Recently demonstrated was efficient generation of desirable small-size microbubbles in liquids by applying oscillation to the air flow supplied into the aerator - preferably by means of a simple and inexpensive fluidic oscillator. It remained unexplained what the oscillation actually does with the bubbles. In this paper was established that microbubbles are produced in a process consisting of several discrete steps, in each growing in size. Oscillation of the gas flow can eliminate this growth and keep the resultant bubbles small. Two alternative mechanisms were identified than can suppress the growth. Úplný záznam
	Mechanism of Multiple Microbubble Conjunctions Tesař, Václav ; Šonský, Jiří In typical generation of microbubbles by blowing the gas through tiny holes in an aerator, the size of bubbles is much larger than hole exit diameter. Explanation for this discrepancy was found by analysing high-speed camera images of bubble generation. Primary microbubbles, of initial size corresponding to the aerator exits, tend to remain near the location of their formation at the aerator exit - and coalesce there with subsequently formed other primary microbubbles. Typically, this coalescence is repeated several times before the increased final size and position of the resultant larger bubble reaches the limit for separation and ascent. Úplný záznam

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