期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 436, 期 -, 页码 1130-1139出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2013.08.051
关键词
Wet foam; Mixing; Fibre suspension; Macro-instability; Bubble size; Air content
资金
- Academy of Finland (project Fibre-Laden Foams)
- EffNet program of Finnish Bioeconomy Cluster (FIBIC)
- Graduate School at Technical Research Centre of Finland (VTT)
The air content and bubble size distribution in pure foams and in fibre foams were determined in axial mixing for varied rotation speed, liquid surface tension and wood fibre concentration. Onset of flow macro-instabilities was observed at high rotation speeds both with and without fibres. Before the instability, the bubble size decreased and air content increased with increasing rotation speed. After the instability, the air content was not only strongly affected by rotation speed but, interestingly, both the air content and bubble size increased with reduced surface tension. In both regions, the average bubble size could be explained based on the capillary number after the air content was explicitly included in the model. Added fibres reduced the bubble size in the stable mixing region and for low surface tension levels in the unstable mixing region. This was probably caused by increased shear forces due to inertia of fibres breaking up the large bubbles in the foam. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据