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- W1981612186 abstract "Porous mullite ceramics with unidirectionally oriented pores were prepared by an extrusion method using rayon fibers as the pore formers and the characteristics of microbubbles generated by these porous ceramics were investigated. The 1200 mm long ceramics were tubular and of thick or thin types of 20–30 mm inner diameter and 30–50 mm outer diameter, respectively. The thin and thick samples had porosities of 47 and 49% and average pore radii of 7.8 μm. The gas permeabilities of the thick and thin samples were 4.1 × 10−14 and 5.4 × 10−14 m2, respectively. Microbubbles were generated by introducing N2 gas through the ceramic tube by immersing it into water. The minimum pressure (bubble point pressure) for generation of microbubbles was 20 kPa, much lower than for other bubble-forming methods. The average microbubble radii ranged from about 70 to 105 μm at flow rates of 0.15–0.25 L/min in the thin sample and 0.3–0.7 L/min in the thick sample. These bubble sizes are much smaller than calculated for a Fritz-type bubble such as generally formed by bubbling from pores and/or orifices. However, the present bubble sizes agree well with the calculated value based on nanobubbles, indicating that bubble formation occurs by mixing the gas with water in small pores. Since microbubbles enhance the dissolution rate of a gas phase in water, they are potentially useful for improving water environments, especially oxygen-deficient water. The effectiveness of gas dissolution in water was confirmed by determining the dissolution behavior of CO2 gas using these porous ceramics." @default.
- W1981612186 created "2016-06-24" @default.
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- W1981612186 date "2010-04-01" @default.
- W1981612186 modified "2023-10-11" @default.
- W1981612186 title "Characteristics of microbubbles generated by porous mullite ceramics prepared by an extrusion method using organic fibers as the pore former" @default.
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- W1981612186 doi "https://doi.org/10.1016/j.jeurceramsoc.2009.11.003" @default.
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