CO2-Driven diffusiophoresis and water cleaning: similarity solutions for predicting the exclusion zone in a channel flow.
CO2-Driven diffusiophoresis and water cleaning: similarity solutions for predicting the exclusion zone in a channel flow.
复制标题
二氧化碳驱动的扩散电泳和水净化：预测通道流中禁区的相似解决方案。
作者：
Suin Shim;M. Baskaran;Ethan H. Thai;H. Stone
我们研究实验和理论上的扩散电泳分离带负电荷的颗粒在矩形通道流，从一侧壁的CO2溶解驱动。由于带负电荷的粒子在引入CO2的边界附近创建了一个禁区，因此我们通过在二维配置中应用剪切流近似来模拟该问题。从方程的形式，我们定义了一个相似变量转换的反应扩散方程的CO2和离子和对流扩散方程的颗粒分布的常微分方程。相似性变量的定义表明了颗粒排除区的特征长度尺度。我们认为高度平均的矩形通道中的流动行为合理化，并连接我们的实验观察与模型，通过计算壁剪切速率作为通道尺寸的函数。我们的观察和理论模型提供了设计参数，如流速，通道尺寸和CO2压力的流入式水清洗系统。
We investigate experimentally and theoretically diffusiophoretic separation of negatively charged particles in a rectangular channel flow, driven by CO2 dissolution from one side-wall. Since the negatively charged particles create an exclusion zone near the boundary where CO2 is introduced, we model the problem by applying a shear flow approximation in a two-dimensional configuration. From the form of the equations we define a similarity variable to transform the reaction-diffusion equations for CO2 and ions and the advection-diffusion equation for the particle distribution to ordinary differential equations. The definition of the similarity variable suggests a characteristic length scale for the particle exclusion zone. We consider height-averaged flow behaviors in rectangular channels to rationalize and connect our experimental observations with the model, by calculating the wall shear rate as functions of channel dimensions. Our observations and the theoretical model provide the design parameters such as flow speed, channel dimensions and CO2 pressure for the in-flow water cleaning systems.
影响因子：
2.7
作者：
Gupta, Ankur;Rallabandi, Bhargav;Stone, Howard A.
通讯作者：
Stone, Howard A.