Arora Deepak, Deshpande Abhijit P, Chakravarthy S R
Department of Chemical Engineering, Indian Institute of Technology, Madras, Chennai 600036, India.
J Colloid Interface Sci. 2006 Jan 15;293(2):496-9. doi: 10.1016/j.jcis.2005.06.055. Epub 2005 Jul 27.
Study of spreading phenomena on porous substrates is important from theoretical as well as applications point of view. An example of such applications is composite processing, where operations involve displacement of air/volatiles by polymeric fluids through porous media composed of fibers. In this work, dynamics of drop spreading was investigated on fibrous porous substrates used in composite processing. These porous media are heterogeneous and anisotropic. Spreading front of silicon oil drops was tracked on borosilicate glass, quartz, and two different kinds of glass fiber mats: woven fabric and unidirectional. For the woven fabric, spreading front was observed to progress in steps of increasing and decreasing rate. For the unidirectional mat, the spreading front progressed with decreasing rate. The dynamics of spreading were fitted to power law in order to compare results with other porous substrates.
从理论和应用的角度来看，研究液滴在多孔基材上的铺展现象都很重要。此类应用的一个例子是复合材料加工，其中的操作涉及聚合物流体通过由纤维组成的多孔介质置换空气/挥发物。在这项工作中，研究了复合加工中使用的纤维多孔基材上液滴铺展的动力学。这些多孔介质是非均质且各向异性的。在硼硅酸盐玻璃、石英以及两种不同类型的玻璃纤维毡（机织物和单向毡）上跟踪了硅油滴的铺展前沿。对于机织物，观察到铺展前沿以速率增加和减小的步骤前进。对于单向毡，铺展前沿以速率减小的方式前进。为了将结果与其他多孔基材进行比较，将铺展动力学拟合为幂律。
