3D打印过程微流道尺度效应建模与数值模拟  

Modeling and Numerical Simulation of Micro-tube Scale Effects in 3DP Process

作　　者：陈从平[1] 王小云[1] 黄杰光[1] 李波[1] 

机构地区：[1]三峡大学机械与动力学院,湖北宜昌443002

出　　处：《系统仿真学报》2017年第6期1359-1365,1373,共8页Journal of System Simulation

基　　金：国家自然科学基金(51475266;51005134);三峡大学研究生科研创新基金(2014CX027)

摘　　要：3D打印微流道尺度效应主要表现为壁面滑移和粘性耗散,它们影响熔体的流动特性和热物理特性,进而影响打印质量。针对上述两种效应,分别建立了理论模型,并运用流体仿真软件Polyflow对丙烯腈-丁二烯-苯乙烯共聚物(Acrylonitrile butadiene styrene,ABS)熔体在不同长径比的微流道中的壁面滑移和粘性耗散效应及其相互影响进行了研究。结果表明,壁面滑移程度随滑移系数减小而增大,熔体流速分布随管径增大而整体减小;粘性耗散程度随着微喷管入口温度升高和管径增大而减小;考虑壁面滑移时熔体的粘性耗散程度降低;粘性耗散和壁面滑移随着入口温度升高而同时减弱。Wall slip and viscous dissipation are two main scale effects in 3DP （Three dimensional printing） process, which has influences on the material＇s flow properties and thermophysical properties and the printing quality. According to the two phenomena above, theoretic models of wall slip and viscous dissipation were established, respectively, and the software Polyflow was used to study the two scale effects and their interactions with molten ABS in micro-tubes of different radius. Simulation results show that wall slip level increases with the slip coefficient decreasing, and material＇s velocity decreases with the increase of tube radius; Viscous dissipation level decreases with inlet temperature rising and tube radius decreasing. Furthermore, material＇s temperature in wall considering wall slip is lower than that without wall slip, and both wall slip and viscous dissipation level decrease when the inlet temperature rises.

关 键 词：3D打印 壁面滑移 粘性耗散 建模 数值模拟 

分 类 号：O351.2[理学—流体力学]