喷射打印用纳米银浆流变特性数值模拟研究

为探究纳米银浆在影响参数下经过喷射打印通道的流变特性,文中以纳米银浆的喷射打印过程为背景建立二维轴对称的几何模型,设定层流和静电物理场,选择动力粘度、表面张力、横向电场以及介电常数为影响参数,利用 COMSOL 软件对纳米银浆在不同条件作用下形成滴液的过程进行了数值模拟。结果表明:随着动力粘度增大,纳米银浆的最大速度增加,且其宽度与长度维度均变化明显;表面张力系数对纳米银浆的最大速度具有显著影响,而介电常数和电场强度对纳米银浆的流变特性的影响并不明显。由此可见,动力粘度及张力系数对纳米银浆流变特性的影响更为重要。

Numerical Simulation of Rheological Properties of Nano-meter Silver for Jet Printing

In order to study the rheological characteristics of nano-meter silver passing through the jet printing channel under influence parameters, the numerical simulation for dropping process of nano-meter silver under different conditions is carried out by COMSOL software in this paper. A two-dimension axisymmetric geometric model is established based on the spraying and printing process of nano-meter silver , the laminar flow and electrostatic physical fields are set, and the dynamic viscosity, surface tension, transverse electric field and dielectric constant are selected as influencing parameters. The results show that with increase of dynamic viscosity, the maximum speed of nano-meter silver increases and its width & length dimensions change obviously; that surface tension coefficient has significant effect on the maximum velocity of nano-meter silver, while the influence of dielectric constant and electric field strength on the rheological characteristics of nano-meter silver is not obvious. Therefore, dynamic viscosity and tension coefficient are more important to the rheological proper- ties of nano-meter silver.