Horizontal drying fronts during solvent evaporation from latex films
Horizontal drying fronts during solvent evaporation from latex films
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DOI：
10.1002/aic.690440916
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发表时间：
1998-09-01
期刊：
影响因子：
3.7
通讯作者：
Russel, WB
中科院分区：
文献类型：
--
作者：
Routh, AF;Russel, WB
流延在基底上的胶乳膜通常不均匀地干燥，干燥前沿将流体域与穿过膜的固化区域分开。对于小于特征水平距离的初始膜厚度，分析预测表面张力驱动的水平流。在确保垂直均匀性的极限中，示出了紧密堆积的颗粒的前部如何形成和传播。施加毛细管压力的最大值导致溶剂前沿退回到膜中。这种衰退是最小的，但可以显着影响颗粒前沿的传播。整体质量平衡提供了无限毛细管压力的解决方案，从而说明了前沿传播的机制。预测无限域和有限域的前沿位置作为最大毛细压力的函数。选择性或非均匀蒸发产生最终的膜轮廓，而蒸发区域仍然可见。在对不同面积进行预测后，将最小面积与实验进行比较。
Latex films cast on a substrate often dry nonuniformly, with a drying front separating fluid domains from solidified regions passing across the film. For initial film thicknesses that are smaller than the characteristic horizontal distance, the analysis predicts surface-tension-driven horizontal flow. In a limit that ensures vertical homogeneity it is shown how a front Of close-packed particles forms and propagates. Imposing a maximum for the capillary pressure causes a solvent front to recede into the film. This recession is minimal, but can markedly affect the propagation of the particle front An overall mass balance offers a solution for infinite capillary pressure, thereby illustrating the mechanism for propagation of the front. The positions of the fronts are predicted for both infinite and finite domains as a function of the maximum capillary pressure. Selective or nonuniform evaporation produces final film profiles, while the evaporating regions are still visible. After predictions otter different size areas are made, the smallest area is compared with experiment.