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Cavitation Phenomena Inside an Autoclave Containing a Chemically Active Bubbly Medium

Mitropetros K., Fomin P. A., Ruckelshausen A., Hieronymus H

Archivum Combustionis

2004

Vol. 24 nr 1-2

53-69

In this work, cavitation phenomena inside an autoclave that contains a chemically active bubbly medium were investigated. Such media are required to conduct processes, such as liquid-phase hydrocarbon oxidation. The liquid was cyclohexane and contained explosive gas bubbles of cyclohexane and oxygen. Rarefaction waves were created inside the medium by the impact of a detonation wave on its surface. High speed optical 100,000 fps) and pressure 1Mhz) measurements were applied. The behavior of the pre-existing explosive bubbles as well as of the cavitation bubbles during the propagation of a pressure wave with positive and negative phase was optically recorded. This behavior was simulated by calculation. The calculated results correlate reasonably well with the experimental observations. Additionally, the influence of the internal geometry of the liquid's vessel on the existence of cavitation phenomena is experimentally demonstrated. It was found that asymetries in the cylindrical volume of the liquid, vertical to the propagation direction of a rarefaction wave, disturb or eliminate this wave.

Shock induced ignitions of oxygen bubbles in cyclohexane under normal conditions

Mitropetros K., Hieronymus H, Steinbach J., Plewinsky B.

Archivum Combustionis

2002

Vol. 22 nr 1-2

55-70

The shock induced explosion behavior of oxygen bubbles in cyclohexane under normal conditions has been investigated. For the investigations a cylindrical autoclave containing a bubble generator was used. High speed optical and pressure measurements were carried out. In the present work the explosion behavior of bubbles was investigated not only in the first pulsations after the icident shock wave passage, as is the general practice in the literature, but also for many pulsations after it. Two types of bubble ignition were observed. One type of explosion is the well known bubble explosion occuring in the first bubble pulsation after the shock wave impact. The other type was previously unknown. It takes place after many bubble pulsations and has a significantly longer ignition delay. The behavior of a single bubble, which showed the second type of ignition is described. Furthermore it is shown by optical measurements that both types of bubble ignition can take place under the same conditions, i.e. during the same experiment.