Transport properties in a nanoparticle-laden flow are of great importance for their practical use, such as in tubular reactor-based photocatalytic technologies. In our study, an experimental setup based on photocatalytic application was employed to investigate the nanoparticle transport characteristics in a flow reactor. An interesting periodical attenuated oscillation of the particle volume fraction and mean particle size with time was found in the nanoparticle-laden flow. We further analyzed the period of the attenuated oscillation curve by conducting a linear fitting, which shows that the period can be expressed as T = f(Q,L) in which the period is proportional to the length of the test section and inversely proportional to the flow rate. We found that the time 5T is a very important criterion for determining whether the particle suspension has reached the quasi-steady state and whether the nanoparticle has been well suspended. Our work is believed to be valuable, efficient, and effective in the study of transportation of nanoparticles in laminar flow with low energy consumption.

中文翻译：

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纳米级负载颗粒层流中的衰减周期振荡特性

载有纳米颗粒的流中的传输特性对其实际应用非常重要，例如在基于管式反应器的光催化技术中。在我们的研究中，采用基于光催化应用的实验装置来研究流式反应器中的纳米颗粒传输特性。在载有纳米颗粒的流中发现了有趣的周期性衰减的颗粒体积分数和平均粒径随时间的振荡。我们通过进行线性拟合进一步分析了衰减振荡曲线的周期，这表明该周期可以表示为T = f（Q，L），其中周期与测试部分的长度成正比，与流量成反比。我们发现时间5 T是确定粒子悬浮液是否已达到准稳态以及纳米粒子是否已良好悬浮的非常重要的标准。我们的工作被认为在研究低能耗的层流中纳米颗粒的运输方面是有价值，高效和有效的。