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泡沫分离论文翻译
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| 这是由于形成的泡沫中的液膜两侧均与气相接触，两个气液界面上均吸附着表面活性分子，对于SDS是以十二烷基硫酸根的形式在气液界面上定向排列形成表面扩散双电层[17]，如图6所示。当两界面靠近到一定程度，带有相同电荷的粒子之间相互排斥，会阻止泡沫进一步变薄。根据第2节原理可以知道，泡沫在通过筛板时，气泡相互挤压加强泡沫的排液以及气泡的扩张都会导致液膜变薄。对于持液量比较大的泡沫，经筛板作用后仍然存在一定厚度的液膜来维持泡沫的稳定。对于持液量比较小的泡沫，本身液膜的厚度已经很薄，双电层作用导致自身排液困难，但是筛板仍会强制其排液，使液膜进一步变薄。因此经筛板作用，持液量越小的泡沫的液膜越薄，当与空气直接接触的气泡更容易受蒸发诱导而消泡；当在内部的气泡也因液膜太薄难以维持气泡的稳定而更容易聚并形成空穴，从而容易进行消泡。 |
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刘亚君880530: 金币+20, 翻译EPI+1, ★有帮助, 一般 2012-12-07 09:07:56
刘亚君880530: 金币+20, 翻译EPI+1, ★有帮助, 一般 2012-12-07 09:07:56
| This is due to the contact of the both sides of the formed foam’s liquid film with the gas phase, the surface active molecules are adsorbed in the two-liquid interface, the SDS which is in the form of lauryl sulfate directionally arranges forming the surface diffusion electric double layer in the gas-liquid interface[17],as shown in Figure 6. When the two interfaces is close to a certain extent, the particles with the same charge each other and it will prevent the foam further thinning. In accordance with the principles of the second section, we can know when the foam through the sieve, the enhancement of mutual squeeze between the foam, the liquid discharge and the expansion of the foam will case the thinner liquid film. For the foam with larger liquid holdup, there is a certain thickness of the liquid film to maintain the stability of the foam after the sieve effect. For the foam with smaller liquid holdup, the thickness of the liquid film of its own is very thin, the role of the electric double layer cause the difficulties of its own liquid discharge, but the sieve will still force its liquid discharge, the liquid film further thinned. Therefore，by the sieve effect, the foam with the smaller liquid holdup will get the thinner liquid film, the foam in the direct contract with the air is more susceptible to evaporation induced leading to defoam; The internal foam is easier aggregating and forming a hole since the liquid film is too thin to maintain air bubbles stable, and thus prone to defoaming. |
2楼2012-12-06 20:25:21
sklyer_123
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刘亚君880530: 金币+5 2012-12-26 08:48:12
刘亚君880530: 金币+5 2012-12-26 08:48:12
This is due to the formation of the bubble in the liquid film on both sides and gas phase exposure, two gas-liquid interface are adsorbed surfactant molecules, for SDS is twelve alkyl sulfate forms at the air-liquid interface are aligned along the formation of surface diffuse electric double layer [17], as shown in figure 6. When the two interface close to a certain extent, with the same charge between particles repel each other, will prevent further bubble thinning. According to the second principles can know, foam in through the sieve, bubble mutual extrusion reinforcing foam drainage and bubble expansion will lead to membrane thinning. The liquid holdup is large compared to the foam, the sieve effect still exists a certain thickness of liquid film to maintain the stability of foam. The liquid holdup is small compared to the foam, itself has very thin film thickness, the electric double layer lead to its discharge is difficult, but still enforce the discharge sieve plate, the film further thinning. Therefore, the sieve plate, liquid holdup smaller bubble liquid membrane is thin, when in direct contact with air bubbles are more easily influenced by evaporation induced and defoaming; when in the interior of the bubble by liquid membrane is too thin to maintain stable and easier bubble coalescence to form a hole, thereby easily defoaming. |
3楼2012-12-25 17:12:29
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