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	High-speed Imaging of Beer Foam Formation: Effect of Surfactants Novák, Pavel ; Baszczyňski, Martin ; Brányik, T. ; Zedníková, Mária ; Růžička, Marek ; Drahoš, Jiří In this experimental study we developed a visualization method based on the high-speed imaging technique. The method consists of application of high-speed digital camera and image analyzing software. The method is suitable for investigating the mechanism of bubble formation (nucleation) and collision of bubbles with liquid surface. The supression of bubble coalescence, whence foam formation, was tested on different samples of model liquids and beers differing in surfactant content. Detailed record
	Effect of Coalescence on Gas Holdup and Volumetric Mass Transfer Coefficient in Bubble Column Fialová, Marie ; Orvalho, Sandra ; Zedníková, Mária ; Růžička, Marek ; Drahoš, Jiří This contribution deals with effect of coalescence on gas holdup and volumetric mass transfer coefficient in bubble column. Detailed record
	Parametry ovlivňující proces usazování částic (2.část měření) Kulaviak, Lukáš ; Růžička, Marek ; Drahoš, Jiří ; Hladil, Jindřich The aim of our contribution is in estimating the effect of the particles properties on their settling behaviour in solid-liquid suspensions. Second campaign is especially aimed at mercury porosimetry and surface tension as measurement of contact angle. Surface texture is illustrated by AFM (Atomic Force Microscopy) images. The AFM topography is carried out in oscillating regime Detailed record
	Použití metody ideálního a neideálního tlakového skoku pro kLa měření a vliv přídavku elektrolytu na zádrž plynu a kLa v probublávané koloně Fialová, Marie ; Orvalho, Sandra ; Zedníková, Mária ; Růžička, Marek ; Drahoš, Jiří The dependences of the volumetric liquid-side mass transfer coefficient, kLa and the gas holdup on gas superficial velocities (0.01-0.20 m s-1) in coalescent and non-coalescent media are presented. The effect of coalescence on kLa values and gas holdup in heterogeneous bubbling regime is discussed. The empirical relations for limiting dependences of kLa and gas holdup values for electrolyte addition in bubble column obtained from experimental data are presented. Detailed record
	Validace optických sond-fikce a realita Večeř, Marek ; Vejražka, Jiří ; Sechet, P. ; Orvalho, Sandra ; Růžička, Marek ; Cartellier, A. ; Drahoš, Jiří This contribution deals with the dynamics of the penetration of the fine thin sharp tip of a optical fiber probe with the gas-liquid interface at a surface of a gas bubble freely moving in a liquid. Simple experiments were performed where the process under study was monitored with help of two independent sources of information, employed simultaneously. Detailed record
	Numerické modelování turbulentního výtoku tekutiny z kruhové trysky a jeho experimentální ověření Cvetinovič, C. ; Tihon, Jaroslav ; Vejražka, Jiří ; Drahoš, Jiří Subject of present work is a turbulent circular air free jet, which issues from a bell-shaped converging nozzle. The aim of the investigation is comparison of the different turbulent models proposed for the unsteady modelling of turbulent air jet issuing to the still surroundings and model validation by hot-wire anemometry velocity measurements. Detailed record
	Numerický model pro turbulentní neustálené impaktní proudění tekutiny a jeho experimentální ověření Cvetinovič, C. ; Tihon, Jaroslav ; Vejražka, Jiří ; Drahoš, Jiří Introduction subject of present work is submerged, round, unconfined impinging air jet, which issues from a bell-shaped converging nozzle. The aim of the investigation is comparison of the different turbulent models proposed for the unsteady modelling of turbulent impinging air jet and model validation by hot-wire anemometry velocity measurements. Detailed record
	Hydrodynamika bubliny narážející na stěnu. Experiment a modelování Zedníková, Mária ; Vejražka, Jiří ; Růžička, Marek ; Drahoš, Jiří The contribution deals with both experimental and theoretical investigation of collision of a bubble with a horizontal hydrophobic (glass) surface. The terminal bubble velocity, impact velocity, contact time of bubble with the wall and restitution coefficient (ratio of restitution and terminal velocity) are evaluated (by means of a high-speed camera) as a function of bubble size, which is ranging from 0.34 to 2.07 mm. The experimental results are compared with the models based on a balance of forces acting on a bubble during the interaction process. A good agreement is showed between the experimental data and theoretical predictions. Detailed record
	Aspekty koalescence dvojic bublin Orvalho, Sandra ; Martín, M. ; Zedníková, Mária ; Růžička, Marek ; Drahoš, Jiří The present work focus on one of the less understood problems controlling the bubble size distribution in this type of devices and, as a result, the contact area between phases and the mass transfer rate: the coalescence. Detailed record
	Experimentální sledování bublin stoupajících v linii Stanovský, Petr ; Zedníková, Mária ; Růžička, Marek ; Drahoš, Jiří ; Sanada, T. ; Shirota, M. ; Sato, A. ; Watanabe, A. Present contribution addresses some aspects of the behavior of a bubble chain composed of bubbles with Re in the range (based on the terminal velocity of single bubble). Bubble chains were created using bubble generator with oscillating needle or acoustic bubble generator. These devices enable to create bubble chains with different initial spacing and bubble diameter. Air bubbles were rising in various liquids as ultrapure water, silicon oils and ethanol. Detailed record

See also: similar author names
2	Drahoš, Jan
2	Drahoš, Jiří

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