亚微米颗粒在Sierpinski海绵模型中热泳沉积研究

Thermophoretic Deposition of Sub-micron Particles in Model of Sierpinski Sponge

亚微米颗粒由于其特殊的粒径尺度,具有很多不同于与传统细颗粒的物理和化学性质,同时极易吸入人体,对人体造成很大危害。谢尔宾斯基海绵模型作为一种理想化的结构模型,具有内比表面积大、多通道等特点。通过建立可工程应用的谢尔宾斯基海绵模型通道,并结合热泳沉积相关数学模型开展计算,可以发现:随着谢尔宾斯基海绵阶数的上升,内部通道的增加是引起亚微米颗粒热泳沉积率上升的主要因素;在海绵通道中运动的亚微米颗粒较之其他粒径的颗粒,更容易受到热泳沉积的影响;同时温差对其热泳沉积影响较为剧烈,呈现线性变化。建立具有工程特征的谢尔宾斯基海绵模型通道,可为研究亚微米颗粒沉积及脱除开辟一条新途径。

Due to the special size of sub-micron particles, there are a lot differences from traditional t-me particles with physical properties and chemical properties. The particles can easily be inhaled by human body, and causing great harm to the body. Sierpinski sponge model as an idealized structural model, with characteristics of large specific surface area and multi-channel, through establishment of Sierpinski sponge model channel which can be applied in the project, and combined with mathematical model of thermophoretic deposition, it can be found that as the order of Sierpinski sponge increased, main factors of sub-micron particle thermophoretic deposition rate were the ascension of internal channels. Compared with other size of the particles, moving in the sponge-channel sub-micron particles are more susceptible to thermophoretic deposition effects. Temperature difference has a great impact on thermophoretic deposition, and manifesting the characteristics of linear change. Establishment of Sierpinski sponge model channel with engineering features can open up a new way to study sub- micron particle deposition and desorption.