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[求助]
求翻譯一段,英翻中,和消泡劑有關(guān),翻譯好的追分
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If a thin oil layer covers the air–water surface and many small, hydrophobic solid particles are present at the surfaces of the antifoam oil drops and are able to enter the air–water surface, they showed that capillary effects cause the oil layer at the surface to form an oil collar around the portion of the particle projecting outward from the drop (Fig. 2). If the equilibrium contact angle αSO between the oil–water interface and the solid surface (measured through the water) exceeds 90°, inspection of Fig. 2 reveals that as oil is drawn into the collar, the contact line at the bottom of the collar advances until it meets the contact line where the solid emerges from the oil drop. At this point the collar coalesces with the drop, allowing the drop to enter the air–water surface. On the other hand, if there is no oil layer on the air–water surface, the criterion for oil to enter the surface following entry by a solid particle is more restrictive [1]: A+B>180° with A the equilibrium contact angle (measured through the water) where an air–water interface meets the solid. Thus, when solid particles are present at the oil–water interface, an oil drop can enter the air–water surface in some cases in the presence of but not in the absence of an oil layer on the surface. [ Last edited by lsyfdcg on 2012-3-5 at 14:40 ] |
木蟲(chóng) (小有名氣)
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如果薄油層覆蓋在空氣與水接觸的表面,許多小的疏水固體顆粒就會(huì)出現(xiàn)在消泡劑的油滴表面,從而作用于空氣與水的接觸面,有人發(fā)現(xiàn)毛細(xì)管效應(yīng)可以使表面油層在部分粒子周?chē)纬蓮囊旱蜗蛲馔渡涞挠腿Γ▓D2)。如果油與水接觸面與固相表面(測(cè)量水所得)平衡接觸角αSO超過(guò)90度,從圖2可知,一旦油滴變成油圈,在油圈底部的接觸線就會(huì)向前移動(dòng),直到它到達(dá)從油滴出現(xiàn)固相的接觸線為止,在這一點(diǎn)上,油圈可以與油滴合并在一起,從而使油滴進(jìn)入空氣與水的接觸面。另外一方面,如果在空氣與水的接觸面上沒(méi)有油層,對(duì)于油滴進(jìn)入表面再進(jìn)入固體顆粒的標(biāo)準(zhǔn)是更加嚴(yán)格的【1】:A+B>180°。A為空氣-水接觸面與固體(相)接觸的平衡接觸角(測(cè)量水所得)因此,當(dāng)固體顆粒出現(xiàn)在油-水接觸面時(shí),在某些情況下,油滴是可以進(jìn)入空氣與水接觸面的,在...存在下,在表面就不會(huì)出現(xiàn)油層。 PS:最后一句語(yǔ)法不對(duì),可能是漏詞了。只能這么翻譯了。 下回能給出圖來(lái),就更好理解了。 |
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