Suzuki Akira, Maruyama Hideo
Laboratory of Bioresources Chemistry, Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University, Minato 3 1 1, Hakodate, 041-8611, Japan
J Colloid Interface Sci. 2001 Jun 1;238(1):54-61. doi: 10.1006/jcis.2001.7492.
The influence of the liquid properties and the operating variables on the intrinsic volumetric flow rate, q(0), of the droplets at the liquid-atmosphere interface in nonfoaming adsorptive bubble separation and that, W(f0), of the liquid in foam at the liquid-foam interface in foam separation was studied to estimate the enrichment ratio of surface-active substance in the two techniques. Each intrinsic flow rate was determined by the extrapolation method, which the authors proposed previously, and was mainly influenced by superficial gas velocity, liquid viscosity, and surface tension. Although the changes in the surface tension and the liquid viscosity were small, they greatly affected the intrinsic flow rates for both the droplets and the liquid in foam. The experimental results were applied to a dimensional analysis. Dimensionless volumetric flow rates, q(0)/Q and W(f0)/Q, were successfully correlated with a dimensionless number (Ohnesorge number, Z=&mgr;(L)/(rho(L)sigmad(b))(0.5)). q(0)/Q=6.66 Z(1.46) and W(f0)/Q=2.53Z(0.533) were obtained for the nonfoaming and the foaming regions within errors of 30 and 35%, respectively. The enrichment ratio of surface-active substance in the droplets and the liquid in foam to the bulk liquid was derived by using these correlations for the nonfoaming and the foaming regions, respectively. A good agreement of the experimental enrichment ratio and the calculated ones was obtained by using the correlations for nonfoaming and foaming. Copyright 2001 Academic Press.
研究了液体性质和操作变量对非发泡吸附气泡分离中液 - 气界面处液滴的本征体积流率(q(0))以及泡沫分离中液 - 泡沫界面处泡沫中液体的本征体积流率(W(f0))的影响，以估算这两种技术中表面活性物质的富集比。每种本征流率均通过作者先前提出的外推法确定，且主要受表观气体流速、液体粘度和表面张力影响。尽管表面张力和液体粘度的变化较小，但它们对液滴和泡沫中液体的本征流率有很大影响。实验结果应用于量纲分析。无量纲体积流率(q(0)/Q)和(W(f0)/Q)成功地与一个无量纲数（奥内佐格数，(Z = \mu(L)/(\rho(L)\sigma d(b))^{0.5})）相关联。对于非发泡区域和发泡区域，分别在(30%)和(35%)的误差范围内得到(q(0)/Q = 6.66Z^{1.46})和(W(f0)/Q = 2.53Z^{0.533})。分别利用非发泡区域和发泡区域的这些关联式，推导出液滴和泡沫中液体中表面活性物质相对于本体液体的富集比。通过使用非发泡和发泡的关联式，实验富集比与计算值取得了良好的一致性。版权所有2001年学术出版社。
