Temat: surface coalescence

Skocz do pozycji: 1.

Tytuł:: Application of hydrophobic sintered polymers for dewatering of diesel fuel
Odwadnianie oleju napędowego z wykorzystaniem hydrofobizowanych spieków polimerowych
Autorzy:: Krasiński, A.
Wierzba, P.
Tematy:: odwadnianie paliw
filtracja
koalescencja powierzchniowa
hydrofobowość
fuel dewatering
filtration
surface coalescence
hydrophobicity; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2072782.pdf Link otwiera się w nowym oknie
Opis:: W pracy przedstawiono badania odwadniania oleju napędowego z wykorzystaniem mediów porowatych uzyskanych przez spiekanie granulatów polimerowych. Opracowano procedurę testowania ﬁltrów odwadniających w oparciu o istniejące metody standardowe. W celu uzyskania większej hydrofobowości spieków przeprowadzono próby modyﬁkacji powierzchni skutkujące powstaniem pokryć o odpowiednim składzie chemicznym i mikrochropowatości. Efekty tych działań zweryﬁkowano w obserwacjach mikroskopowych i doświadczalnie.
Dewatering of diesel fuel using sintered granular polymers is studied in the paper. A testing procedure was elaborated based on existing standard testing methods for fuel filters. To increase the hydrophobicity of polymer media a few types of surface modification, resulted in relevant chemical composition and morphology (roughness) of the surface, were performed. Effect of coating were verified experimentally and via SEM observations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A novel technique to investigate the bubble coalescence in the presence of surfactant (MIBC) and electrolytes (NaCl and CaCl2)
Autorzy:: Gungoren, C.
İslek, E.
Baktarhan, Y.
Kursun, I.
Ozdemir, O.
Tematy:: surface tension
salt
Bubble Coalescence Time Measurement; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110886.pdf Link otwiera się w nowym oknie
Opis:: An efficiency of flotation process is strongly dependent upon the collecting ability of air bubbles. On the other hand, the liquid film formed beetween two fully or partially mobile air/liquid interfaces being in contact has low stability, which leads to fast liquid drainage. Therefore, when they approach to each other, they tend to coalescence. Therefore, bubble coalescence is usually controlled with frothers in flotation process. Meanwhile, it is known that dissolved ions inhibit bubble coalescence. In this study, the bubble coalescence in the presence of MIBC was determined using a novel technique with a modified bubble-particle attachment timer. Additionally, the effect of NaCl and CaCl2 on bubble behavior was investigated along with surface tension and bubble coalescence time aspects. As a result of study, it is seen that the bubble coalescence time can be successfully determined with a bubble-bubble coalescence timer.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An investigation of air/water interface in mixed aqueous solutions of KCl, NaCl, and DAH
Autorzy:: Gungoren, Can
Tematy:: bubble coalescence
surface tension
KCl
NaCl
DAH; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110641.pdf Link otwiera się w nowym oknie
Opis:: Flotation of soluble salts such as borax, potash, and trona is carried out in their saturated solutions. The high ion concentration of the flotation suspension can affect the floatability of the minerals as well as the coalescence behaviors of the bubbles. The bubble coalescence can be inhibited in the presence of dissolved ions at high ion concentrations as well as with the use of surfactants. In this study, the effect of the mixtures of KCl, NaCl, and dodecyl amine hydrochloride (DAH) on air/water interface was investigated with surface tension and bubble coalescence time measurements for potash flotation. The surface tension measurements indicated that lower surface tension values obtained with mixed KCl and NaCl solutions than their single solutions. In addition, the surface tension of the mixed KCl and NaCl solutions increased with the NaCl and the ionic strength of the solution. The dynamic surface tension measurements indicated that while ion adsorption on air/water interface was so fast, DAH molecules required more time for adsorption probably related to the viscosity of the solution. In addition, the bubble coalescence time measurements showed that the bubble coalescence could be inhibited with the use of DAH in the absence and presence of KCl and NaCl. In the absence of DAH, the bubble coalescence time was determined as 100 ms, 270 ms, and 650 ms, respectively for 100% KCl, 100% NaCl, and 50%KCl+50% NaCl salt solutions. Therefore, the trend in the success of the salt solutions for the inhibition of bubble coalescence can be written as 100%KCl<50%KCl+50%NaCl<100% NaCl according to the bubble coalescence time. The results of this study indicated that there was no clear relationship between the surface tension and the inhibition of the bubble coalescence. However, the bubble coalescence time measurements showed that while the bubble coalescence time was 650 ms in the presence of Na⁺ ions, it was 100 ms in the presence of K⁺ ions 100 ms. It can be concluded from the results obtained from this study that the bubble coalescence phenomena may be managed by the specific ion pairing types in solutions which significantly affect the flotation recovery of minerals.
Dostawca treści:: Biblioteka Nauki

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