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LIQUID BRIDGE ERUPTION FOR MESOSCALE GRAVURE PRINTING USING MULTI-BODY DISSIPATIVE PARTICLE DYNAMICS

Mohsen Torabi
School of Engineering, University of California, Merced, CA 95343, USA

Ahmed A. Hemeda
Mechical Engineering Deprtament, University of California, Merced, California 95343, United States

Anupam Mishra
School of Engineering, University of California, Merced, CA 95343, USA

Ting Liu
School of Engineering, University of California, Merced, CA 95343, USA

Yanbao Ma
Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, USA

DOI: 10.1615/TFEC2019.nmf.028350
pages 1525-1535


KEY WORDS: Liquid-bridge, Printing, Surface characterization, Mesoscale simulation, Fluid flow visualization.

Abstract

Gravure is an important high quality and throughput printing technique, which has various modern applications such as coating and printed electronics. Although it has been used for centuries, the liquid transfer regime has not been thoroughly understood. Current computational methods have restrictions on various aspects of these types of investigations such as limited spatial and temporal scales. In addition, due to the singularity of the bridge neck, the printing process has been treated into two stages: pre- and post-breakup. In this investigation, free interface and pinned geometries in connection with gravure printing process for liquid transfer, have been assumed. Multi-body dissipative particle dynamics (MDPD) has been used as an effective tool to simulate this dynamic process. Effects of various specifications of the printing process such as surfaces wettability and capillary number have been examined on the printing outcomes such as transfer ratio and maximum height of the bridge. It has been observed that the maximum free interface bridge height happens while the contact angle of the liquid on the surface is around 150 degree. This investigation opens the door for mesoscale printing simulations while there is no other simulation technique to visualize fluid flow in this scale.

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