两种微混合器对高黏度流体乳化过程的适用性研究（英文）

Applicability of Two Kinds of Micromixers for High Viscosity Fluid Emulsification Process

微混合器以其独特的混合特性越来越受到重视,近年来人们开始将其应用于乳胶基质的制备中。利用两种微混合器分别进行乳胶基质的初乳和精乳,探讨了分离再结合型微混合器对高黏度流体的乳化原理并研究了微混合器微通道宽度,长度,以及流体流速等因素对乳化效果的影响。结果表明,不同类型的微混合器适合不同的乳化阶段。在流体总流量为40 mL·min^(-1)的条件下制备出了黏度为38000 cP,水相颗粒度平均值为1.895μm的乳胶基质。常温储存30天后硝酸铵(AN)的溶解损失率为0.2497%。分离再结合型微混合器对高黏度流体的乳化原理是流道壁对流体的剪切作用。微通道宽度显著影响乳化压力。微通道长度越长,流体流速越大,乳化质量越好。

More and more attention has been paid to the micromixer as its unique mixed features. In recent years, the micromixer has been applied to the preparation of the emulsion matrix. Two kinds of micromixers were used to complete separately the first emulsification and the second emulsifi- cation of emulsion matrix. Both of the emulsion principle of the split-recombine micromixer for high viscosity fluid and the influence of the width, length of the microchannel and fluid flow velocity on the emulsification effect were discussed. Results show that different types of micromixers are suitable for different stages of the emulsification. Under the conditions of the total fluid flow of 40 mL min-1 , a good quality emulsion matrix with viscosity of 38000 cP and average granularity of aqueous phase of 1. 895 μm is prepared by the micromixers. The dissolution loss rate of ammonium nitrate （AN） was 0. 2497% after 30 days storage at room temperature. The emulsification principle of the caterpillar split-recombine micromixer for high viscosity fluids is the shear effect of the microchannel to the fluids. The width of the microchannel affects the pressure of emulsification signifi- cantly. The longer the length of microchannel is, the larger the flow velocity of fluid is and the better the quality of emulsification is.