Bubble Sizes in Electrolyte and Alcohol Solutions in a Turbulent Stirred Vessel

摘要: Bubble size distributions have been measured by a new video technique at 3 points near the wall in vessel of 150 mm diameter air-sparged ∼1 vvm agitated Rushton turbine an energy dissipation rate ∼1Wkg-1. Water and solutions electrolytes alcohols were used. These solutes give surface tensions less than water (alcohols) greater (electrolytes) concentrations chosen to produce which, based on work bubble columns coalescence cells, can be considered partially-coalescing non-coalescing. Regardless tension, sizes non-coalescing approximately same much water, whilst those partiallycoalescing case where tension was equal that gave intermediate sizes. Thus, Weber number cannot correlate such results. On other hand, concept being controlled coalescence-inhibitionafter initial break-up works well. In all cases, bubbles as small 40 μm found even some 40% below 300 μm, smallest practicably measurable capillary technique. Surprisingly, decreased with height possible reasons for this are discussed.