Prediction of surface area in polydisperse gas-suspension systems with variable apparent surface tension, viscosity and density

Folia Microbiologica - Tập 18 - Trang 248-256 - 1973
J. Kloud1, Z. Štěrbáček1, M. Šáchová1
1Institute of Microbiology, Czechoslovak Academy of Sciences, Prague 4

Tóm tắt

Bubble size distribution was found to be represented by a modified log-normal distribution with 3 parameters. The parameters are simple functions of suspension properties,viz. surface tension, viscosity and density, and a function of superficial gas rate. Correlations are presented, enabling the prediction of the distribution constants (and thus of the bubble size distribution) from the system properties and gas rate. Model translucent systems can be used, having identical apparent system properties as real suspensions in experimental work. A computer algorithm is presented for (i) prediction of bubble size distribution, defining the region of formation of spherical bubbles, (ii) converting particle size distribution into volume distribution, (iii) determining the actual gas volume from a hold-up correlation, and (iv) giving the surface area of the system of a given predicted distribution.

Tài liệu tham khảo

Kloud J., Štěrbáček Z., Rudiš M.: Bubble residence time distributions in bubble columns operating with microbial suspensions I. Distribution of bubble sizes in simulated translucent systems. Proc. AME’71 Symposium, Mariánské Lázně 1972, J. Wiley & Sons, New York 1973. Maier C. G., Production of small bubbles at orifices.U.S. Bureau of Mines Bull. No.260, 62 (1927). Mugele R. A., Evans H. D.: Drop size distributions in liquid-liquid systems.Ind. Eng. Chem. 43, 1317 (1961). Štěrbáček Z., Šáchová M., The prediction of bubble shapes and volumes of single bubbles formed at submerged orifices in yeast suspensions. Biotechnol. Bioeng., in press. Valentin F. H. H.: Absorption in gas liquid dispersions. E. & F. N. Spon Ltd., London 1967, 212 pp.