微尺度下速度滑移对油墨流动特性的影响

为了了解微尺度下速度滑移对油墨流动特性的影响,以便提高印刷质量,首先从理论方面分析了速度滑移对流体流动特性的影响.运用专业流体仿真软件FLUENT对微尺度下油墨在墨辊间的流动进行了流体计算模拟,分析了无滑移和有滑移2种情况下油墨在传递过程中流动速度与压力的特性,同时提取墨层有效厚度,并进行对比.通过分析可以得出:当滑移速度与油墨流速方向相同时,随着速度滑移程度的提高,在油墨通道的各个位置处油墨的速度都有增大的趋势,压力有减小的趋势,墨层厚度有变大的趋势;当滑移速度与油墨流速方向相反时,随着滑移程度的增强,油墨的速度有减小的趋势,压力有增大的趋势,墨层厚度有变小的趋势.

Influence of Slip Velocity on Ink Flow Characteristics in Microscale

To research the influence of slip velocity ink flow characteristics in microscale on improving printing quality, this paper first theoretically analyzed it. Then, ink flowing among ink rollers were simulated by using FLUENT that is professional flow simulate software. The ink velocity and pressure were analyzed from two aspects:non-slip and slip. Meanwhile, the ink effective thickness was extracted. Finally, the characteristic data was comparatively analyzed. Result shows that the ink velocity increases, the pressure will be reduced and the thickness will increase as the degree of slip increases when the direction of slip velocity is as same as the velocity of ink. The ink velocity decreases, the pressure will increase, and the ink thickness will be reduced as the degree of slip increases when the direction of slip velocity is as opposite as the velocity of ink.