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首页> 外文期刊>Energy Conversion & Management >Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance
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Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance

机译：带有尖端间隙的针翅结构交错排列的微通道中层流对流换热和流体流动的熵产生和优化

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摘要

Entropy generation rate accounting for heat transfer and flow friction is presented for the flow in microchannel with staggered pin fin arrays, clearance existing between the pin fin tip and the shroud plate. Within the scope of the present work, entropy generation rate due to heat transfer is levels of magnitude higher than that from flow friction, which is nonetheless not negligible considering its scaling effect on the pumping power consumption, for all cases under investigation. For the pin fin structure with high aspect ratio (height-to-diameter), the effect of tip clearance was found more pronounced with a conductive nature competing with the convective. When this ratio is low, the convective effect dominates the variation of entropy generation by heat transfer and flow friction, the effect of the clearance gap favored by higher aspect ratio. The entropy minimization method is applied to seek for an optimal combination of all impact factors under investigation. The Pareto frontier along with its corresponding solution sets are obtained by Multiobjective Optimization Genetic Algorithm. The solution sets acquired for the scenario with high-aspect-ratio pin fin fall within the region of lower pin fin density where the trade off between the convective and the conductive effects is identified. On the other hand, dominated by the convective nature, the solution sets for cases with lower aspect ratio are in principle located at the upper bounds.
机译：提出了考虑到传热和流动摩擦的熵产生率，该信息是对于交错排列的针状翅片阵列，存在于针状翅片尖端和护板之间的间隙的微通道中的流动。在本研究的范围内，由于热传递而产生的熵的发生率要比由于流动摩擦而产生的熵的发生率高，但是考虑到它对泵送功率消耗的比例影响，在所有研究中，这都是可以忽略的。对于具有高深宽比（高径比）的针翅结构，发现尖端间隙的影响更加明显，其导电特性与对流竞争。当该比率低时，对流效应将主导由传热和流动摩擦产生的熵的变化，而间隙效应则受较高的纵横比的影响。熵最小化方法被用来寻找正在研究的所有影响因素的最佳组合。通过多目标优化遗传算法获得帕累托边界及其对应的解集。针对具有高纵横比的引脚鳍的情况而获得的解决方案集落在较低引脚鳍密度的区域内，在该区域中确定了对流效应和导电效应之间的权衡。另一方面，以对流性质为主导，长宽比较低的情况下的解集原则上位于上限。

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  • 来源
    《Energy Conversion & Management》 |2015年第4期|493-504|共12页
  • 作者

    Zhongyuan Shi; Tao Dong;

  • 作者单位

    Institute of Applied Micro-Nano Science and Technology, Chongqing Technology and Business University, 19 Xuefu Ave., Nan'an District, Chongqing, China,Chongqing Engineering Laboratory for Detection, Control and Integrated System, Chongqing Technology and Business University, 19 Xuefu Ave., Nan'an District, Chongqing, China;

    Department of Micro and Nano Systems Technology (IMST), Faculty of Technology and Maritime Sciences (TekMar), Buskerud and Vestfold University College (HBV), Raveien 215, 3184 Borre, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Entropy generation; Heat transfer; Flow friction; Pin fin; Tip clearance; Multiobjective optimization;

    机译：熵产生;传播热量;流动摩擦;针鳍;尖端间隙;多目标优化;

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