微尺度下黏度对油墨流动特性的影响

Influence of Viscosity on Ink Flow Characteristics in Microscale

为了研究油墨黏度对印刷过程中微尺度下油墨流动特性的影响,首先从理论方面分析黏度对油墨流动特性的影响,然后运用专业流体仿真软件FLUENT分别在有/无滑移2种条件下分析黏度对油墨流动特性的影响.结果表明:2种条件下,油墨最大压应力都随黏度增大而增大;无滑移时,黏度对油墨流动速度无影响,而有滑移情况下,随黏度增大,油墨流动速度先增大后减小,之后基本保持不变.通过2种条件的对比分析,考虑滑移与否,对油墨最大速度影响较大,因此在分析黏度对油墨流动特性的影响时必须考虑滑移.

To research the influence of the ink viscosity on the ink flow characteristics in microscale during the printing process,the ink viscosity on the ink flow characteristics was first analyzed in theory.Then,the effect of the viscosity on the ink flow characteristics was simulated in conditions of slip and no slip using FLUENT that is professional fluid simulation software.Results show that under two conditions,the maximum pressure increases with the increase of the viscosity.Under no slip condition,the viscosity has no effect on the ink velocity.However,under the slip condition,with the increase of the viscosity,the ink velocity increases first and then decreases,however,remains unchanged fianlly.By contrast,considering the slip or not,it has great influence on the maximum velocity of ink.Therefore,it is necessary to consider the slip when analyzing the influence of the viscosity on the ink flow characteristics.