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[求助]
泡沫分離論文翻譯
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| 這是由于形成的泡沫中的液膜兩側均與氣相接觸，兩個氣液界面上均吸附著表面活性分子，對于SDS是以十二烷基硫酸根的形式在氣液界面上定向排列形成表面擴散雙電層[17]，如圖6所示。當兩界面靠近到一定程度，帶有相同電荷的粒子之間相互排斥，會阻止泡沫進一步變薄。根據(jù)第2節(jié)原理可以知道，泡沫在通過篩板時，氣泡相互擠壓加強泡沫的排液以及氣泡的擴張都會導致液膜變薄。對于持液量比較大的泡沫，經(jīng)篩板作用后仍然存在一定厚度的液膜來維持泡沫的穩(wěn)定。對于持液量比較小的泡沫，本身液膜的厚度已經(jīng)很薄，雙電層作用導致自身排液困難，但是篩板仍會強制其排液，使液膜進一步變薄。因此經(jīng)篩板作用，持液量越小的泡沫的液膜越薄，當與空氣直接接觸的氣泡更容易受蒸發(fā)誘導而消泡；當在內部的氣泡也因液膜太薄難以維持氣泡的穩(wěn)定而更容易聚并形成空穴，從而容易進行消泡。 |
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sklyer_123
銀蟲 (小有名氣)
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劉亞君880530: 金幣+5 2012-12-26 08:48:12
劉亞君880530: 金幣+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樓2012-12-25 17:12:29
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劉亞君880530: 金幣+20, 翻譯EPI+1, ★有幫助, 一般 2012-12-07 09:07:56
劉亞君880530: 金幣+20, 翻譯EPI+1, ★有幫助, 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樓2012-12-06 20:25:21
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