2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal
| Editors: | Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 350 pages |
| ISBN: | 978-1-987820-50-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Experimental Investigation on Bubble Formation from Multi-Hole Nozzles
Hongjie Yan1; Junbing Xiao1; Zhiwen Hu2;1CENTRAL SOUTH UNIVERSITY, Changsha, China; 2, Changsha, China;
Type of Paper: Regular
Id Paper: 339
Topic: 6
Abstract:
Bubble formation is extensively studied by various operating conditions mostly investigated on single-hole nozzle or porous nozzle. However, few investigation is focused on bubble formation process generated from multi-hole nozzles. In present work, bubble formation was originally studied by injecting nitrogen with different gas flow rates through multi-hole nozzles submerged in quiescent water. Different nozzles with different number of holes were employed to investigate the influence of holes on bubble formation. The process of bubble formation was captured by a high speed camera and analyzed by a digital image processing algorithm. The bubbling regimes, bubble diameter and circularity were applied to quantitatively analyze the bubble formation. Drawing from the results, the bubble regimes were categorized into single bubbling with delayed release, double bubbling with delayed release and double bubbling without delayed release. Simultaneously, different stages of the formation process were divided to describe the bubble formation. Afterwards, bubble diameter and circularity were quantitatively analyzed to investigate bubble characteristics. An appropriate equation for prediction of bubble diameter was proposed by combining the opening ratio, inner diameter of nozzle and Reynold number. It was found that the bubble formation process from multi-hole nozzles was pretty regular and noticeably stable. As a result, the present work can not only benefit the research on bubble formation generated from multi-hole nozzles but also guide the application of multi-hole nozzles in practice.
Keywords:
Non-Ferrous; Smelting;Bubble formation; Multi-hole nozzle; Bubbling regime; Opening ratio.References:
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