Vera M U, Durian D J
UCLA Department of Physics & Astronomy, Los Angeles, California 90095-1547, USA.
Phys Rev Lett. 2002 Feb 25;88(8):088304. doi: 10.1103/PhysRevLett.88.088304. Epub 2002 Feb 11.
Experiments are presented elucidating how the evolution of foam microstructure by gas diffusion from high to low pressure bubbles can significantly speed up the rate of gravitational drainage, and vice versa. This includes detailed data on the liquid-fraction dependence of the coarsening rate, and on the liquid-fraction and the bubble-size profiles across a sample. These results can be described by a "coarsening equation" for the increase of bubble growth rate for drier foams. Spatial variation of the average bubble size and liquid fraction can also affect the growth and drainage rates.
本文展示了一些实验，阐明了通过气体从高压气泡向低压气泡扩散而导致的泡沫微观结构演变如何能够显著加快重力排水速率，反之亦然。这包括关于粗化速率对液体分数的依赖性，以及关于整个样品中液体分数和气泡尺寸分布的详细数据。这些结果可以用一个“粗化方程”来描述，该方程用于描述较干燥泡沫中气泡生长速率的增加。平均气泡尺寸和液体分数的空间变化也会影响生长和排水速率。
