Abstract
ABSTRACT Pure carbon dioxide was absorbed in a thin liquid sheet that was formed by the impingement of two individual sheets. The sheets were produced by an impingement-sheet mixing device that was previously shown to provide rapid micromixing of two liquids (a few milliseconds for low-viscosity liquids). Three different impingement-sheet mixing devices were tested at flow rates between 3 and 20 L/min and at device pressure drops up to 3·0 bar. Despite the short exposure times (4 to 40 milliseconds) of the mixed sheet, significant amounts of carbon dioxide were absorbed (48 to 92% of saturation) Carbon dioxide absorption was explained by a mathematical model of the diffusion within the sheet. Since the collision of the individual sheets produces turbulence within the impingement zone of the mixed sheet, the data were correlated assuming an overall effective diffusivity that was from 5 to 167 times the molecular diffusivity. The overall diffusivity enhancement factor was correlated with the component veloc...
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