Gas holdup and volumetric liquid-phase mass transfer coefficient in a gel-particle suspended bubble column with draught tube.

Overall volumetric mass transfer coefficient in a modified reversed flow jet loop bioreactor with low density particles

“…It was observed that KLa increased with increased gas flow rate for a given energy dissipation rate per unit volume, (E/V)L. This was due to the increase in the gas holdup and the interfacia] area at higher gas flow rates. Similar trends have been reported in the literature for jet loop reactors with two-phase system [2,5,10] and for bubble column reactor with three-phase system [13], and also for three-phase fluidized bed reactor [11].…”

“…Particles for use in bioreactors consist of enzymes or microorganisms immobilized on support particles, where the densities of the particles normally are of the order of 1000-1300 kgm -3 and diameter of 1-3 mm. The effect of such low-density particles on the hydrodynamics and mass transfer has been reported in the literature on threephase fluidized beds [11,12] and on bubble columns [13].…”

D-arabitol production from lactose by Kluyveromyces lactis at different aerobic conditions

“…The ratio of k L a to (k L a) 0 , estimated by our previous correlation, 24 is from 1.0 to 0.993, if dry cell mass concentration X ranges from 0.004 g L −1 to 10.2 g L −1 . Hence, an assumption can be made that k L a in K. lactis NBRC 1903 suspension is in the neighborhood of (k L a) 0 .…”

“…The k L a of oxygen decreases with increasing suspended solids concentration, 24 hence the k L a during batch growth of K. lactis NBRC 1903 appears to decrease with time from (k L a) 0 . The ratio of k L a to (k L a) 0 , estimated by our previous correlation, 24 is from 1.0 to 0.993, if dry cell mass concentration X ranges from 0.004 g L −1 to 10.2 g L −1 .…”

Effects of Swirl Bubble Injection on Mass Transfer and Hydrodynamics for Bubbly Flow Reactors: A Concept Paper

“…From the literature, gas void fraction is linear with the gas flow rate and the superficial gas velocity. As the gas velocity increases, the amount of gas introduced per unit time increases, this leads to an increase in gas void fraction [16][17] [13]. Interfacial area between gas and liquid also increases, with increase in gas void fraction [11].…”