Interphase mass transfers local coefficients

The gas-liquid simulations shown here were performed with software developed by Bakker (1992), which contains models for gas dispersion, bubble coalescence and breakup, and interphase mass transfer. The local gas volume fraction is shown on the left. The local mass transfer coefficient kia (with values multiplied by 3) is shown in the middle, and the local bubble size (with values multiplied by 30) is shown on the right. All figures share the same scale from 0 to 0.3 (which is why the mass transfer coefficient and local bubble size distributions are multiplied by a factor). The bubble size is smallest near the impellers and increases away from them, due to coalescence. The mass transfer coefficient is highest near the impellers, where the bubble size is smallest (leading to a large interfacial area) and where the turbulence intensity is highest (leading to fast surface renewal around the bubbles). The stair-stepped representation of the... 

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