Bubble behavior in a vacuum fluidized bed

IF 1.9 4区工程技术 Q3 ENGINEERING, CHEMICAL

Chemical Engineering Communications Pub Date : 2023-09-27 DOI:10.1080/00986445.2023.2261100

Hengzhi Chen, Wangyang Zou

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Abstract

AbstractBubble behavior in a vacuum fluidized bed was investigated in this work. Experimental results showed that bubble diameter and rise velocity increased with declining the pressure, whereas bubble density decreased. The evolution of bubble density with bed height could be divided into three stages on the basis of the corresponding net-coalescence rates. The decrease in bubble density in the bottom region accelerated as the pressure decreased, whereas the increase in bubble density in the top region was gentle. Increasing the vacuum degree enlarged the variation in bubble size, resulting in the decline of operating stability in the fluidized bed. A new correlation that considered the effect of operating pressure on bubble behaviors exhibited accurate prediction in the vacuum fluidized bed. Bubble velocity was proportional to bubble diameter for small bubbles, and bed structure obviously affected the rise velocity of large bubbles. The distribution of the bubble aspect ratio was positively skewed and many bubbles had a tendency to become slender as the operating pressure decreased.Keywords: Bubble behaviorcoalescence ratedigital image processingvacuum fluidized bed Disclosure statementNo potential conflict of interest was reported by the authors.

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真空流化床中的气泡行为

摘要本文对真空流化床中的气泡行为进行了研究。实验结果表明，随着压力的降低，气泡直径和上升速度增大，气泡密度减小。根据净聚结速率，气泡密度随层高的演化可分为三个阶段。随着压力的减小，底部气泡密度的减小速度加快，而顶部气泡密度的增大较为平缓。真空度的增大增大了气泡尺寸的变化，导致流化床运行稳定性下降。在真空流化床中，考虑了操作压力对气泡行为的影响，建立了一个新的关系式，对气泡行为进行了准确的预测。小气泡的气泡速度与气泡直径成正比，床层结构对大气泡的上升速度影响明显。气泡长径比的分布呈正偏态，随着操作压力的降低，许多气泡有变细的趋势。关键词:气泡行为聚结率数字图像处理真空流化床披露声明作者未报告潜在利益冲突。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Communications 工程技术-工程：化工

CiteScore

5.50

自引率

4.00%

发文量

审稿时长

6 months

期刊介绍： Chemical Engineering Communications provides a forum for the publication of manuscripts reporting on results of both basic and applied research in all areas of chemical engineering. The journal''s audience includes researchers and practitioners in academia, industry, and government. Chemical Engineering Communications publishes full-length research articles dealing with completed research projects on subjects such as experimentation (both techniques and data) and new theoretical models. Critical review papers reporting on the current state of the art in topical areas of chemical engineering are also welcome; submission of these is strongly encouraged.