화학공학소재연구정보센터
Minerals Engineering, Vol.13, No.4, 365-372, 2000
Gas dispersion properties: Bubble surface area flux and gas holdup
Bubble surface area flux has been related to flotation performance and advocated as a key "machine variable" Analysis of available data suggests that bubble surface area flux (S-b) and gas holdup (epsilon(g)) are related by Sr, approximate to 5.5 epsilon(g). This was the case for flotation columns;and mechanical cells, both laboratory and plant scale, over the approximate range Sb < 130s(-1) and epsilon(g) < 25%. A relationship is expected given their similar dependence on gas rate and bubble size (both increase as gas rate increases and bubble size decreases). Reasons that a relationship may be obscured, especially in full size units because of the difficulty in defining the overall S-b and epsilon(g), are discussed The possibility to replace S-b by epsilon(g) as the machine variable has the advantage that gas holdup is easier to measure. (C) 2000