2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 5: Starkey Intl. Symp. / Mineral Processing
| Editors: | Kongoli F, Kumar P, Senchenko A, Klein B, Silva A.C., Sun C, Mingan W |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 270 pages |
| ISBN: | 978-1-987820-44-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Directional collection in bubble fractionation by near-post meniscus
Shanpeng Li1; Jianlin Liu1;1CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao, China;
Type of Paper: Regular
Id Paper: 267
Topic: 5
Abstract:
Although the effect of interfacial tension of liquid is often negligible at the macroscale, it plays an essential role in such areas as superhydrophobicity on rough surfaces, water walking of aquatic creatures and self-assembly of small particles or droplets. In this study, we investigate the migration and assembly of bubbles near the meniscus produced by a slender post with various cross sections.This topic actually is a fundamental subject for bubble fractionation in chemical engineering£¬the oil displacement in the steam-foam process and collection of oils from emulsified oil wastes in petroleum engineering.
The results show that the bubble always migrates to the solid wall of the post, although the cross section shape, material and tilt angle of the post are different. Especially, the final position of the bubble is not located at the singular point of the cross section, which is beyond what we have imagined. We simulate the morphology of the triple contact line via Surface Evolver, and then address the mechanism of bubble¡¯s migration from the viewpoint of force analysis and energy calculation. The factors governing the final position of the bubble are analyzed according to the scaling law. These obtained results cast new light on modulating the assembly of bubbles and small droplets by varying the material, geometric shape and posture of the post in water. These findings also have important implications for oil collection and oil displacement in petroleum engineering, drug delivery, design of microfluidic devices and chemical sensors.