Characteristics of microbubbles generated by porous mullite ceramics prepared by an extrusion method using organic fibers as the pore former

Generation of Two‐Phase Air‐Water Flow with Fine Microbubbles

“…According to [7], microbubbles are tiny bubbles with a diameter in the range of 10-50 μm (according to other definitions, the diameter is less than several hundred microns [15,20]). Such bubbles were successfully produced in different devices based on liquid-gas interaction (using a Venturi tube [21], a rotational plate [22], porous ceramics [23], gas supply to rotat-Inna Levitsky 1,2 Dorith Tavor 2 Vitaly Gitis 3 1 ing flow [24], etc.). Nevertheless, the generation of gas microbubbles in a really efficient way remains a major challenge.…”

Production of highly aligned porous alumina ceramics by extruding frozen alumina/camphene body

“…25 In other words, during freezing, the molten camphene grows dendritically and repels the alumina particles, which would lead to the formation of a bicontinuous structure comprised of three-dimensionally interconnected camphene dendrites and alumina particles. 26,27 This bicontinuous structure can be preserved during extrusion, whereas camphene dendrites can be deformed and elongated extensively, allowing the creation of highly aligned, interconnected pores.…”

Porous ceramics mimicking nature—preparation and properties of microstructures with unidirectionally oriented pores

“…The high permeability of these ceramics allows a minimum applied pressure for bubble generation to be as low as 0.02 MPa, such as produced by a domestic air pump; this gives these ceramic bubblers a considerable advantage over other bubblers which require much higher power and/or pressure. The effectiveness of these unidirectional porous ceramics as bubblers is confirmed by their 3-4 times faster dissolution rate constant for bubbling gas into the solution, compared with a commercial bubbler [86].…”

“…These are very promising results for a number of applications. The high permeability of unidirectional porous ceramics prepared by the EF method makes them ideal for filters and membranes, and also for a possible application as a ceramic bubble [86]. The bubbles obtained from this ceramic Bending strength and permeability of unidirectional porous ceramics prepared by the EF method and conventional porous ceramics ( : [84], : [70], ♦: [85]).…”