マイクロ流路内における均一乳化液滴生成範囲の予測(流体工学,流体機械)

概要

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To simulate the emulsification process in a micro-channel, a computational fluid dynamics (CFD) technique, called the volume of fluid (VOF) method, was used. To improve computational accuracy, the mesh of the simulation model was divided finely enough and a parallel computation for a large-scale CFD simulation was executed to calculate the emulsified droplet generation process in a micro-channel. As a result, it was confirmed that the length of droplet position determined by the VOF method agrees well with the experimentally measured within an error of 5%. In accordance with that agreement between calculation and experiment, a map of the generation of uniform emulsified droplets was constructed by using the VOF method. The map is defined by two dimensionless parameters: Reynolds number (Re) and Capillary number (Ca). It is clear from the map that the generation of droplets peaks at Re of 3.0 to 4.0 and Ca of 10.0×10^<-3>. The map makes it possible to generate emulsified droplets experimentally within a coefficient of variation (C_v) of 5.0%.
2009-12-25