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Particle Transport in Microchannels

机译：微通道中的粒子传输

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In this article, the author describes a set of models of particle transport in microchannels that has been recently developed at FUJIFILM Dimatix for design and optimization inkjet print heads. The models are used to estimate the modes of particle transport in horizontal channels, the times for particles to settle at the bottom of a channel, and the fluidization flow velocity. The Rouse number is commonly used to estimate the mode of sediment transport in horizontal turbulent flow with large Reynolds number. However, in microchannels such as in modern inkjet systems, the liquid flows are usually laminar. In this article, the author uses a modified Rouse number that is expanded to the case of weakly turbulent and laminar flows. To illustrate the applicability of the modified Rouse number, he applies it to the transport of pigment particles in a horizontal channel in the FUJIFILM inkjet print head and compares theoretical results with experimental observations. In the article, he also constructs a model to estimate two settling times in rectangular channels: the time of formation of a monolayer of particles at the bottom of a channel and the required time for all particles to settle at the channel bottom. In design and optimization of a print jet head, it is also important to know the critical fluidization flow velocity of the ink to prevent sedimentation of ink pigment particles in vertical channels. In this article, the author constructs a simple model to estimate the maximum fluidization flow velocity as well. The modified Rouse number constructed in this article, as well as presented models, can be used in other applications as well. (C) 2018 Society for Imaging Science and Technology.
机译：在本文中，作者介绍了FUJIFILM Dimatix最近开发的用于微通道中颗粒传输的一组模型，用于设计和优化喷墨打印头。该模型用于估计水平通道中颗粒的运输方式，颗粒在通道底部沉降的时间以及流化流速。劳斯数通常用于估计雷诺数大的水平湍流中的泥沙运移模式。但是，在诸如现代喷墨系统的微通道中，液体流通常是层流的。在本文中，作者使用修改后的Rouse数，将其扩展为弱湍流和层流的情况。为了说明修改后的Rouse编号的适用性，他将其应用于FUJIFILM喷墨打印头中水平通道中颜料颗粒的运输，并将理论结果与实验观察结果进行了比较。在文章中，他还构建了一个模型来估算矩形通道中的两个沉降时间：在通道底部形成颗粒单层的时间以及所有颗粒沉降在通道底部所需的时间。在设计和优化打印喷头时，了解墨水的临界流化流速以防止墨水颜料颗粒在垂直通道中沉降也很重要。在本文中，作者构建了一个简单的模型来估算最大流化流速。本文构造的经过修改的Rouse编号以及提供的模型也可以在其他应用程序中使用。 （C）2018年影像科学与技术学会。

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