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Numerical investigations of entropy generation to analyze and improve heat transfer processes in electric machines

机译：熵产生的数值研究，以分析和改善电机的传热过程

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摘要

A new, canonical configuration is proposed in this work, combining in a single setup the main features of external flows (flow around a cylinder) as well as of internal flows (flow between two concentric cylinders in rotation). This flexible configuration allows parametric investigations of combined transport processes involving both external (Re_∞) and internal (Re_0) flows, as they are found in many technical devices, for instance in electric machines. The present paper first describes and analyzes entropy generation in this canonical configuration numerically for a constant wall heat flux and fixed cylinder (Re_0 = 0), in order to check if the entropic concept can be used to assess and improve industrially relevant designs. A thermal optimization of the configuration is performed to compare the changes observed between initial and optimized design. Based on this, it is shown that the Second Law Analysis (SLA) can be used to find regions where heat transfer could be intensified. The irreversibility distribution φ comparing entropy generation due to dissipation and due to conduction is found to be a promising indicator to detect regions with a high potential for improving heat transfer in technical devices.
机译：在这项工作中，提出了一种新的规范配置，将单个外部流动（围绕圆柱体的流动）和内部流动（两个同心圆柱体之间的流动）的主要特征组合在一起。这种灵活的配置允许对涉及外部流（Re_∞）和内部流（Re_0）的组合运输过程进行参数研究，因为它们在许多技术设备（例如电机）中都可以找到。本文首先描述并分析了在恒定壁热通量和固定圆柱体（Re_0 = 0）下这种规范配置下的熵产生，以便检查熵概念是否可用于评估和改进与工业相关的设计。对配置进行热优化以比较初始设计和优化设计之间观察到的变化。基于此，可以证明第二定律分析（SLA）可用于查找传热可能加强的区域。已发现，比较由于耗散和传导引起的熵产生的不可逆分布φ是检测有潜力改善技术设备中热传递的区域的有希望的指标。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2016年第11期|1199-1208|共10页
  • 作者

    Toni Eger; Thomas Bol; Laszlo Daroczy; Gabor Janiga; Ruediger Schroth; Dominique Thevenin;

  • 作者单位

    Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg 'Otto von Guericke', Universitaetsplatz 2, 39106 Magdeburg, Germany,Robert Bosch SG GmbH, Robert-Bosch Strasse 2, 71701 Schwieberdingen, Germany;

    Robert Bosch SG GmbH, Robert-Bosch Strasse 2, 71701 Schwieberdingen, Germany;

    Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg 'Otto von Guericke', Universitaetsplatz 2, 39106 Magdeburg, Germany;

    Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg 'Otto von Guericke', Universitaetsplatz 2, 39106 Magdeburg, Germany;

    Robert Bosch SG GmbH, Robert-Bosch Strasse 2, 71701 Schwieberdingen, Germany;

    Laboratory of Fluid Dynamics and Technical Flows, University of Magdeburg 'Otto von Guericke', Universitaetsplatz 2, 39106 Magdeburg, Germany;

  • 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 Minimization; Second Law Analysis; Optimization; Irreversibility ratio; Electric machines;

    机译：熵产生最小化;第二定律分析;优化;不可逆比;电机;

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