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首页> 外文期刊>Journal of Imaging Science and Technology >Deposition of Molten Ink Droplets on a Solid Surface
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Deposition of Molten Ink Droplets on a Solid Surface

机译：在固态表面上沉积熔融的墨滴

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摘要

An experimental study on the deposition of micro-size droplets (～ 39 μm in diameter) of molten wax ink on an aluminum surface is presented. Effects of initial temperature of droplets, substrate temperature and distance from printhead to substrate on the deposited droplet shape and textures were investigated. Depending on impact conditions, droplets may have either smooth or irregular edges, and the final shape may be either regular or two tiered. Analysis was conducted to compare the time scales for solidification, viscous damping and oscillation. A simple heat transfer model was developed, and temperature dependences of viscosity and surface tension were taken into account. The Ohnesorge number of droplets was investigated as a function of time to compare the transient effects of viscous damping and oscillation of the droplets after impact. The number of oscillations completed before the Ohnesorge number reaches unity agrees with the number of tiers formed. The height of the first tier was related to the value of the Ohnesorge number during the first oscillation. The thermal capillary effect was evaluated by defining and examining two Marangoni numbers for the spreading and post-spreading phases of the droplet impact. Splashing of droplets occurred and produced fingers around the droplet peripheries, which was mainly determined by local solidification and spreading dynamics in the vicinity of contact line.
机译：提出了在铝表面上沉积熔融蜡墨水的微小液滴（直径约39μm）的实验研究。研究了液滴的初始温度，基底温度以及打印头到基底的距离对沉积的液滴形状和纹理的影响。根据冲击条件，液滴可能具有光滑或不规则的边缘，最终形状可能是规则的或两层的。进行分析以比较凝固，粘性阻尼和振荡的时间尺度。建立了一个简单的传热模型，并考虑了粘度和表面张力的温度依赖性。研究了液滴的Ohnesorge数作为时间的函数，以比较粘性阻尼的瞬时效应和冲击后液滴的振荡。在Ohnesorge数达到1之前完成的振荡次数与形成的层数一致。第一层的高度与第一次振荡期间的欧姆尼斯堡数的值有关。通过定义和检查两个Marangoni数来评估液滴冲击的扩散和扩散后阶段，从而评估热毛细管效应。液滴飞溅发生并在液滴周围产生手指，这主要由接触线附近的局部凝固和扩散动力学决定。

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