464382 Mass Transfer Enhancement as a Function of the Oscillatory Baffled Reactor Design
Recently, oscillatory baffled column (OBC), has used for the same purpose, mass transfer, and presented a significant change in which has been increased up to sixfold comparing with a bubble column. This was due to the combanation effect of baffles and oscillatory motion that increase the radial mixing (diffusion). Also gas-holdup affected by the oscillation frequency and amplitude.
In this study, the volumetric mass transfer coefficient (kLa) in air-water system has been calculated and compared using three designs of OBRs, smooth periodic constrictions (SPC) design, helical baffled design, and single orifice design. This work was conducted over a wide range of oscillation condition and aeration rate, volumetric air flow rate. The SPC presented higher values of kLa than the single orifice baffled reactor and the helical baffled reactor. This indicates that SPC with oscillatory motion provide bigger interfacial contact area between air and water. In addition, the visualisation of bubbles movements inside the three designs of OBR has shown that the bubbles collision and breakage in SPC was more severe. Therefore the bubble size in SPC was smaller than those that achieved in the single orifice OBR then in the helical OBR.
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