Gas-liquid mass transfer performance of dual impeller system employing rushtons, Concave-bladed Disc (CD-6) turbines and thier combination in stirred tank bioreactor.
Suhaili, Nurashikin and Mohamed, Mohd Shamzi and Mohamad, Rosfarizan and Ariff , Arbakariya (2010) Gas-liquid mass transfer performance of dual impeller system employing rushtons, Concave-bladed Disc (CD-6) turbines and thier combination in stirred tank bioreactor. Journal of Applied Sciences Research, 6 (3). pp. 234-244. ISSN 1816-157X
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The degree of oxygenation in stirred tank bioreactor is normally described and characterized L by the volumetric gas-liquid mass transfer coefficient (k a). Throughout this study, the gas liquid mass transfer performance of dual impeller stirring system employing either two Rushton turbines (RT), two Concave-bladed disc (CD-6) turbines or the combination of both was comparatively investigated in Newtonian and non-Newtonian fluid systems. Static gassing-out technique was applied in all experimental L k a determinations and subsequent modeling of mass transfer correlations for all configurations were g L developed by incorporating the effects of power number (N D ) and superficial 3 2 velocity (V ) on k a. Ultimately, the use of dual CD-6 stirrers on a mixing shaft improved the oxygen transfer rate (OTR) by about 5-50 % and 18-65 % higher than the conventional RT-RT system in Newtonian and non-Newtonian systems, respectively.
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