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Coalescence Dynamics of a Droplet Impacting on a Rectangular Pixel for Inkjet Printing
Langmuir ( IF 3.7 ) Pub Date : 2022-12-08 , DOI: 10.1021/acs.langmuir.2c02793 Jinhua Hong 1 , Yifan Jin 1 , Yiwei Jin 2 , Jianfeng Chen 1 , Yulong Li 1 , Jiankui Chen 2
Langmuir ( IF 3.7 ) Pub Date : 2022-12-08 , DOI: 10.1021/acs.langmuir.2c02793 Jinhua Hong 1 , Yifan Jin 1 , Yiwei Jin 2 , Jianfeng Chen 1 , Yulong Li 1 , Jiankui Chen 2
Affiliation
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A droplet impacting on a rectangular pixel with an offset is prone to cause the liquid to spread out of the pixel and adhere to adjacent pixels in organic light-emitting diode (OLED) inkjet printing. Therefore, the coalescence of a droplet impacting on a rectangular pixel is crucial in understanding the reliable OLED inkjet printing. In this paper, an assumption is established that the rectangular coalescence process is divided into the fusion part and spread part. On this basis, a dynamics model is introduced to analyze the coalescence behavior of a droplet impacting on a rectangular pixel. According to the law of conservation of mass and energy, dynamic equations are developed to obtain the maximum spread length as a function of time. In addition, the volume of the fluid method is used to simulate coalescence dynamics of a droplet impacting on a rectangular pixel by using the software of FLUENT, and the analytical solutions are consistent with the simulation results. Furthermore, the effects of the positioning error and initial velocity on the coalescence dynamics are analyzed. The results show that small initial velocity and positioning error of the droplet are helpful for the reliable OLED inkjet printing.
中文翻译：
喷墨打印中液滴撞击矩形像素的聚结动力学
在有机发光二极管 (OLED) 喷墨打印中，撞击具有偏移的矩形像素的液滴容易导致液体扩散到像素外并粘附到相邻像素。因此，影响矩形像素的液滴的聚结对于理解可靠的 OLED 喷墨打印至关重要。本文建立了一个假设，将矩形聚结过程分为融合部分和扩散部分。在此基础上，引入动力学模型来分析液滴撞击矩形像素的聚结行为。根据质量和能量守恒定律，开发了动力学方程以获得作为时间函数的最大传播长度。此外，利用流体体积法，利用FLUENT软件模拟液滴撞击矩形像素的聚结动力学，解析解与模拟结果一致。此外，还分析了定位误差和初始速度对聚结动力学的影响。结果表明，较小的液滴初始速度和定位误差有助于实现可靠的 OLED 喷墨打印。
更新日期：2022-12-08
中文翻译：
喷墨打印中液滴撞击矩形像素的聚结动力学
在有机发光二极管 (OLED) 喷墨打印中，撞击具有偏移的矩形像素的液滴容易导致液体扩散到像素外并粘附到相邻像素。因此，影响矩形像素的液滴的聚结对于理解可靠的 OLED 喷墨打印至关重要。本文建立了一个假设，将矩形聚结过程分为融合部分和扩散部分。在此基础上，引入动力学模型来分析液滴撞击矩形像素的聚结行为。根据质量和能量守恒定律，开发了动力学方程以获得作为时间函数的最大传播长度。此外，利用流体体积法，利用FLUENT软件模拟液滴撞击矩形像素的聚结动力学，解析解与模拟结果一致。此外，还分析了定位误差和初始速度对聚结动力学的影响。结果表明，较小的液滴初始速度和定位误差有助于实现可靠的 OLED 喷墨打印。
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