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Hydrodynamic and Thermal Performance of Microchannels With Different Staggered Arrangements of Cylindrical Micro Pin Fins

机译：圆柱形微针鳍交错排列的微通道的水动力和热性能

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摘要

This study focuses on microheat sinks with different staggered arrangements of micro pin fins (MPFs). A rectangular microchannel with the dimensions of 5000 x 7500 x 100 µm~3 (l' x w' x h' ) was considered for all the configurations while different MPF diameters, height over diameter ratio (HID), and longitudinal and transversal pitch ratios (S_L/D and S_T/D) were considered in different arrangements. Using the ANSYS FLUENT 14.5 commercial software, the simulations were done for different Reynolds numbers between 20 and 160. A constant heat flux of 30 W/cm~2 was applied through the bottom heating section. The performances of the microheat sinks were evaluated using design parameters, namely pressure drop, friction factor, Nusselt number, and thermal-hydraulic performance index (TPI). The effect of each geometrical parameter as well as wake-pin fin interaction patterns were carefully studied using the streamline patterns and temperature profiles of each configuration. The results reveal a great dependency of trends in pressure drops and Nusselt numbers on the wake region lengths as well as the local velocity and pressure gradients. Moreover, the wake region lengths mostly contribute to the increase in obtained pressure drop and Nusselt number with Reynolds number. Although an increase in the HID and S_L/D ratios results in an increase and a decrease in pressure drop, respectively, the effect on the Nusselt number depends on other geometrical parameters and Reynolds number. A larger S_T/D ratio generally results in a decrease in the pressure drop and Nusselt number. Finally, while the friction factor decreases with Reynolds number, two different trends are seen for the TPI values of configurations with the HID ratio of 1 and 2 (D = 100 and 50 pm). While the trend in the TPIs is increasing for Reynolds numbers between 20 and 40, it reverses for higher Reynolds numbers with a steeper slope in the configurations with the S_T/D ratio of 1.5.
机译：这项研究的重点是具有不同交错排列的微型针状鳍片（MPF）的微型散热器。考虑了所有配置的尺寸为5000 x 7500 x 100 µm〜3（l'xw'xh'）的矩形微通道，同时具有不同的MPF直径，高径比（HID）以及纵向和横向螺距比（S_L / D和S_T / D）以不同的方式考虑。使用ANSYS FLUENT 14.5商业软件，对20至160之间的不同雷诺数进行了仿真。通过底部加热部分施加了30 W / cm〜2的恒定热通量。使用设计参数（即压降，摩擦系数，Nusselt数和热工液压性能指标（TPI））评估微散热器的性能。使用每个配置的流线型态和温度曲线，仔细研究了每个几何参数以及尾流鳍鳍相互作用模式的影响。结果表明，压降和努塞尔特数趋势对尾流区域长度以及局部速度和压力梯度的依赖性很大。此外，尾流区长度主要有助于增加获得的压降和具有雷诺数的努塞尔特数。尽管HID和S_L / D比的增加分别导致压降的增加和减少，但是对Nusselt数的影响取决于其他几何参数和雷诺数。较大的S_T / D比通常会导致压降和Nusselt数的减少。最后，尽管摩擦系数随雷诺数的增加而减小，但对于HID比为1和2（D = 100和50 pm）的TPI值，可以看到两个不同的趋势。当雷诺数在20到40之间时，TPI的趋势在增加，而在S_T / D比为1.5的配置中，斜率更陡的高雷诺数则相反。

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  • 来源
    《Journal of Heat Transfer》 |2017年第6期|062402.1-062402.14|共14页
  • 作者

    Ali Mohammadi; Ali Koşar;

  • 作者单位

    Faculty of Engineering and Natural Sciences (FENS), Sabanci University, Orhanli, Tuzla 34956, Istanbul, Turkey;

    Professor Faculty of Engineering and Natural Sciences (FENS), Sabanci University, Orhanli, Tuzla 34956, Istanbul, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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