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Small bubbles oxygenation membrane

机译：小气泡氧化膜

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Large bubbles emerge from porous membranes with small pores because the emerging bubbles spread on the membrane surface before they detache from the surface. If the sessile bubble contact angle (theta) is less than 45degrees, no spreading occurs, and the bubble size is determined by the size of hole. Even in this case, the equivalent diameter (of spherical bubble) is significantly larger than the pore diameter due to the bubble formation mechanism. If theta > 45degrees, the spreading of the emerging bubble on the surface occurs, and the bubble size is determined by the size of base of a sessile bubble, which depends on the value of theta, and is independent of the pore size. The equivalent diameter of a bubble could be greater in order of magnitude than the pore diameter. The same principle applies to the bubble formation from an inclined surface; however, the bubble formation is more complicated because of drifting of a developing bubble out of the orifice and the merging of sliding bubbles. In order to create small bubbles, it is necessary to create small orifices on a hydrophilic surface, of which theta < 45&DEG;, and two orifices should be separated beyond the maximum diameter of emerging bubble. A horizontal flat surface is the best for the creation of small-sized bubbles. (C) 2003 Wiley Periodicals, Inc. [References: 16]
机译：大气泡从具有小孔的多孔膜中冒出，因为出现的气泡在它们从表面分离之前就在膜表面扩散。如果无泡气泡接触角（θ）小于45度，则不会发生扩散，气泡大小由孔的大小决定。即使在这种情况下，由于气泡形成机理，（球形气泡）的当量直径也显着大于孔径。如果θ> 45度，则会出现气泡在表面的扩散，气泡的大小取决于无泡气泡的底部大小，该大小取决于θ的值，并且与孔径无关。气泡的等效直径可以在数量级上大于孔径。相同的原理适用于从倾斜表面形成气泡。然而，由于正在形成的气泡从孔中漂移出来以及滑动气泡的合并，气泡的形成更加复杂。为了产生小气泡，有必要在亲水表面上形成小孔，其θ＜45°，并且两个孔应该分开，以超过出现的气泡的最大直径。水平的平面最适合产生小尺寸的气泡。 （C）2003 Wiley Periodicals，Inc. [参考：16]

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