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A numerical investigation of the flow of nanofluids through a micro Tesla valve

纳米流体在微尺度特斯拉阀中流动的数值研究

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Abstract

In this study, Al2O3-water nanofluids flowing through a micro-scale T45-R type Tesla valve was investigated numerically. Both forward and reverse flows were investigated based on a verified numerical model. The effects of nanofluids flow rate, temperature, and nanoparticle volume fraction on fluid separation in the bifurcated section and the pressure drop characteristics were analyzed. It was found that most of the nanofluids flow into the straight channel of the bifurcated section when flowing forward, and into the arc channel when flowing reversely. The percentage of the main flow increases with flow rate, temperature, and nanoparticle volume fraction. Additionally, the jet flow from the arc channel leads to a larger pressure drop than forward flow. Finally, the diodicity was found most affected by flow rate, and a correlation used to predict the change in diodicity with the flow rate was proposed.

中文概要

目的

微通道以其效率高、体积小等特点在许多领域有 着越来越广泛的应用。特斯拉阀是一种没有运动 部件的止回阀,在微流动控制领域有着明显的优 势。大量研究表明,将纳米流体运用到微尺度通 道中可明显提高换热效率。本文将二者结合,研 究Al2O3-水纳米流体在微尺度特斯拉阀中的流动 特性,为微尺度特斯拉阀以及纳米流体的进一步 研究提供参考。

创新点

1. 将特斯拉阀应用于纳米流体的微流动控制中; 2. 研究不同的操作条件和不同的介质特性对纳 米流体在微尺度特斯拉阀中流动特性的影响; 3. 研究纳米流体在微尺度特斯拉阀中不同流动 方向的流体分布和压力情况,并根据特斯拉阀的 压降比(反向流动压降/正向流动压降)来分析特 斯拉阀对微流动的控制效果。

方法

1. 建立微尺度特斯拉阀的三维模型;2. 通过有效 性验证的数值方法,在不同操作条件和不同流动 介质特性的情况下,模拟纳米流体在微尺度特斯 拉阀中正反两个方向的流动;3. 根据流体在流动 过程中的分布以及压力的变化情况,分析温度、 流体流量和纳米颗粒体积分数对纳米流体在微 尺度特斯拉阀中流动特性的影响。

结论

1. 纳米流体在特斯拉阀中正向流动时,大部分流 体进入了分叉段中的直通道;而反向流动时,大 部分流体进入了分叉段中的弧形通道,并且随着 流量、温度和纳米颗粒体积分数的增加,主流量 的百分比增加。2. 当纳米流体反向流动时,在弧 形通道出口处的射流对压降的影响非常明显,这 是导致反向流动压降大于正向流动的重要原因。 3. 特斯拉阀的压降比受流量的影响最显著;在本 文的研究范围内,压降比随着流量的增加而线性 增加。

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Authors and Affiliations

  1. Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou, 310027, China

    Jin-yuan Qian, Min-rui Chen & Zhi-jiang Jin

  2. MOE Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, Tianjin, 300350, China

    Jin-yuan Qian & Xue-ling Liu

Authors
  1. Jin-yuan Qian
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  2. Min-rui Chen
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  3. Xue-ling Liu
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  4. Zhi-jiang Jin
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Correspondence to Zhi-jiang Jin.

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Project supported by the National Natural Science Foundation of China (No. 51805470), the Fundamental Research Funds for the Central Universities (No. 2018QNA4013), the Open Foundation of Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education of China (No. 201704-403)

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Qian, Jy., Chen, Mr., Liu, Xl. et al. A numerical investigation of the flow of nanofluids through a micro Tesla valve. J. Zhejiang Univ. Sci. A 20, 50–60 (2019). https://doi.org/10.1631/jzus.A1800431

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