Gruy F, Cugniet P
Ecole des Mines de Saint-Etienne, 158, cours Fauriel, 42023 Saint-Etienne Cedex 2, France.
J Colloid Interface Sci. 2004 Apr 15;272(2):465-71. doi: 10.1016/j.jcis.2003.11.026.
The drag coefficient and hydrodynamic radius of particles are important parameters needed in crystallization science. Small aggregates of micrometric primary particles are mainly produced in stirred crystallizers. We present experimental results on the drag coefficient of macroscopic aggregates consisting of glass beads in the number range [2,100]. The drag coefficient is calculated from settling measurements in glycerol in order to preserve the Stokesian nature of typical flow around particles in a crystallizer. We show that the hydrodynamic radius of these aggregates is almost the radius based on the average projected area over all orientations. This result is extended to larger and more porous aggregates.
颗粒的曳力系数和流体动力学半径是结晶科学中所需的重要参数。微米级初级颗粒的小聚集体主要在搅拌结晶器中产生。我们给出了由数量范围在[2,100]的玻璃珠组成的宏观聚集体的曳力系数的实验结果。为了保持结晶器中颗粒周围典型流动的斯托克斯性质，通过在甘油中的沉降测量来计算曳力系数。我们表明，这些聚集体的流体动力学半径几乎是基于所有取向的平均投影面积的半径。这一结果扩展到了更大且孔隙更多的聚集体。
