Abstract
If a gas volume is distributed into many microbubbles of a sub-millimetre size, the total gas/liquid surface becomes very large. This increases overall heat and/or mass transport across the sum of surfaces. The paper discusses several applications in which the use of microbubbles increases efficiency of various processes, especially in wastewater treatment and in growing microorganisms such as algae, yeast, bacteria, or primitive fungi. The problem of microbubble generation by percolation in aerator is their coalescence into larger bubbles, whatever small are the pores in the aerator in which the microbubbles are generated. The solution of this size discrepancy question was found in agitating the gas flow by a fluidic oscillator prior to its injection through the aerator. The oscillator is a no-moving-part device, simple, inexpensive, resistant to external effects like acceleration or heat, and with long maintenance-free working life.
Highlights
Fluidic oscillators having no were moving parts were invented in various alternative verFluidic oscillators having no moving parts invented in various alternative versions already in the years 1960–1965
One important use introduced a decade ago that pushed the oscillators again into the foreground was, introduced a decade ago that pushed the oscillators again into the foreof interest. It is the effect with many uses: Generation of small gas bubbles of a diameter ground of interest. It is the effect with many uses: Generation of small gas bubbles of a less than 1 mm by percolation through a large number of parallel pores in an aerator diameter less than 1 mm by percolation through a large number of parallel pores in an body
There used to be a problem of size discrepancy: Bubbles tended to be larger than aerator body
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. A change in this situation took place with the appearance of the patent [2] It introduced the novel method of microbubble generation, based on gas agitation by a nomoving-part fluidic oscillator prior to the injection of gas into the liquid through pores of an aerator—a body with many small passages. The new low energy approach requires no surfactant and minimises the lysis of organism cells by the bursting that takes place when, in their motion upwards, they reach the top surface of the liquid This novel approach to generation makes microbubbles an interesting and useful subject, bringing advantages applicable in many areas, in particular for reactors in biotechnology. It is centred mainly on the activities taking part at the University of Sheffield in the U.K., where the idea originated
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