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Klasická nukleační teorie-Poznámky k parním turbinám
Němec, T. ; Maršík, František
The Classical Nucleation Theory (CNT) is modified to treat a special case of admixtures - electrolytes. Thermodynamic features of aqueous electrolytic solutions are described in a slightly different way from that for ordinary liquid mixtures. Namely, the excess Gibbs energy is expressed in terms of the osmotic coefficient and the mean stochiometric activity coefficient instead of the activity coefficients.
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Rozložení energie v kavitační bublině během jejího růstu a kolapsu
Müller, M. ; Maršík, František ; Garen, W.
Shock wave generation during the bubble growth and collapse and the corresponding energy separation were investigated experimentally. The calculation of the shock wave energy was based on the experimentally determined shock wave velocity profile. The possibility of using the similarity solution to determine the shock wave intensity is discussed. The velocity field around the collapsing bubble was visualized and compared with the numerical simulation using the commercial FLUENT code.
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Syntetizovaný proud - návrh generátoru a ověření jeho funkce
Trávníček, Zdeněk ; Vít, T. ; de Boer, P. ; Maršík, František
A zero-net-mass-flux actuator was designed, and a synthesis of an air jet was investigated. The operating parameters were suggested near the resonance frequency. The proper actuation was experimentally tested by smoke visualization and hot-wire anemometry. Two typical synthetic jets are presented, namely the so-called "long" and "short" extruded fluid column cases. The maxima of the centerline local and the time-mean velocities reached approximately 27 m/s and 8.7 m/s, respectively.
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