Particle dynamics in drying colloidal solution using discrete particle method

Abstract

We study particle dynamics in drying colloidal solutions using the numerical simulation with discrete particle method (DPM). Simulations of two different systems were conducted; the drying dynamics of monodispersed and binary mixture of colloidal solution, and compared with those from the previous studies. In the monodispersed colloidal solution, the time evolution of particle concentration profile for varying Péclet number was simulated with the same initial particle concentration. In the binary colloidal solution, when the particle size ratio α is 3, three different stratification modes were observed varying Péclet number and initial particle concentration. By comparison, our method was in a good agreement with the existing methods. Additionally, because of the mesh-based Eulerian approach in our model, other various multi-physical phenomena, such as effect of thermal Marangoni or chemical reaction, can be included in an easy way. From the results, we expect that this work can provide a physical insight for predicting the quality of colloidal drying in a complicated situation.

Control of the Drying Patterns for Complex Colloidal Solutions and Their Applications

“…Therefore, it is important to understand the dynamics of dispersed particles in an evaporating sessile droplet, to control the desired morphology. Many studies have demonstrated that the final pattern is influenced by the evaporation mechanism [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], flow dynamics inside the droplet [ 37 , 38 , 39 , 40 ] and multi-body interactions [ 41 , 42 , 43 , 44 , 45 , 46 ]. It was observed that a variety of patterns can be formed by controlling these effects, showing spider-web [ 47 , 48 ], multi-ring [ 49 , 50 , 51 ] and spot-like [ 52 , 53 ] deposits as well as homogeneous morphology.…”

Подавление Пилообразных Осцилляций При Использовании Разностной Схемы Для Моделирования Массопереноса В Высыхающей На Подложке Капле В Приближении Тонкого Слоя

“…Для улучшения этих моделей, алгоритмов и программ необходимо разрабатывать дополнительные модули, позволяющие учесть различные эффекты, влияющие на формирование осадков, в том числе и гидродинамику. В коммерческом пакете Comsol Multiphysics есть модули, позволяющие рассчитывать динамику частиц и гидродинамику [46], но цена на этот пакет относительно высокая. Это касается и дополнительных тулбоксов к Matlab [47].…”