open access

https://hdl.handle.net/2115/8525

Influence of Liquid Properties and Operating Variables on Enrichment Ratio in Nonfoaming and Foaming Adsorptive Bubble Separation Techniques

英語

Ohnesorge number

2001-06-01

Academic Press (Elsevier)

Journal of Colloid and Interface Science

238(1)

54-61

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 both 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. Despite of small change in the surface tension and the liquid viscosity, they greatly affected to the intrinsic flow rate 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 = μ_L /(ρ_L σ d_b)^0.5). q_0/Q = 6.66 Z ^1.46 and W_f0/Q = 2.53 Z ^0.533 were obtained for the nonfoaming and the foaming regions within errors 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 from 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.

学術雑誌論文

Accepted Manuscript

0021-9797

1095-7103