Experimental studies and numerical model validation of overflowing 2D foam to test flotation cell crowder designs
Experimental studies and numerical model validation of overflowing 2D foam to test flotation cell crowder designs
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DOI：
10.1016/j.cherd.2012.05.009
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发表时间：
2012-12-01
影响因子：
3.9
通讯作者：
Cilliers, J. J.
中科院分区：
文献类型：
--
作者：
Cole, K. E.;Brito-Parada, P. R.;Cilliers, J. J.
泡沫运动的计算流体动力学模型已经被开发以评估不同的浮选槽设计。这项工作提出了一种实现的模型在一个二维的情况下，比较模拟的气泡速度分布和流线的实验发泡系统。该模型采用有限元法求解拉普拉斯方程的势函数，从该势函数可以得到泡沫速度。它需要空气回收率，或作为未破裂气泡溢出浮选槽的空气量，作为计算泡沫速度分布和气泡流线的输入参数。通过图像分析从Hele-Shaw柱中产生的垂直溢流单层泡沫（2D）获得空气回收，该柱模拟浮选泡沫的重要流动特性，如聚结。泡沫柱中包含了大量泡沫，以代表工业浮选槽的潜在Crowder设计。选择三种不同的设计来比较插入深度和形状的效果，包括矩形和三角形。从气泡流线和速度分布的视觉评估来看，插入物设计对溢出泡沫的影响是明显的，这与实验和模型都非常一致。(C)2012化学工程师学会。Elsevier B. V.出版，保留所有权利。
A computational fluid dynamics model of froth motion has been developed to assess different flotation cell designs. This work presents an implementation of the model in a 2D case, to compare the simulated bubble velocity distribution and streamlines to an experimental foaming system. The model uses finite elements to solve Laplace's equation for a potential function from which the foam velocity can be obtained. It requires the air recovery, or the amount of air that overflows a flotation cell as unburst bubbles, as an input parameter to calculate the foam velocity distribution and bubble streamlines. The air recovery was obtained by image analysis from a vertical, overflowing monolayer of foam (2D) created in a Hele-Shaw column, which mimicked important flowing properties of flotation froths such as coalescence. Inserts were included in the foam column to represent potential crowder designs for industrial flotation cells. Three different designs were chosen to compare the effect of insert depth and shape, including rectangles and a triangle. The effect of the insert design on the overflowing foam is obvious from visual assessment of the bubble streamlines and velocity distribution, which were closely agreed by both the experiment and model. (C) 2012 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.