The dominant mode of bubble break-up in all the powders was found to be division from the rear, contrast to that observed with Group B powders at atmospheric pressure.
Additionally, the model makes it possible to explain some newly discovered properties of acoustic cavitation that occur at extremely high oscillatory velocities of the radiators, at which the mode of bubble oscillation changes and the bubble behavior approaches that of an empty Rayleigh cavity.
The effects of the gas velocity in the orifice (3 45 m s-1), the liquid cross-flow velocity (0.5 4 m s-1) and the blade configuration on the mode of bubble formation and the detached bubble size are investigated using high-speed flash photography.
It is shown, that many aspects of slow bubble formation, involving phenomena leading to various modes of the bubble release, as well as the maximum orifice diameter which sustains a bubble at equilibrium, can be explained on the basis of information on equilibrium shapes and conditions.
While the sizes of the modes of the bubbles preserved by ash fragments are markedly different for the basaltic versus the dacitic eruption, many complex ash particles preserve both a larger and smaller population of bubbles.
In this paper, we apply a variety of experimental techniques to investigate the influence of the counter-current mode on bubble column hydrodynamics.
The left panel of Figure 2a shows the modes of a single-bubble collapse near a boundary.
Furthermore, a comparative experimental test is carried out with the same operation condition and bed-materials when the gasifier is operated in the mode of single bubbling fluidised bed (BFB), in order to detect the internal regeneration of the catalytic bed materials in the DFB operation.
The influence of bubble column operation mode, sparger orientation, superficial gas velocity, and superficial liquid velocity on the time-dependent gas holdup variation are explained based on their effects on bubble size, bubble contacting frequency and mixing intensity.
