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首页> 外文期刊>International Journal of Heat and Mass Transfer >Convective heat transfer optimization in a circular tube based on local exergy destruction minimization
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Convective heat transfer optimization in a circular tube based on local exergy destruction minimization

机译：基于局部能级破坏最小化的圆管对流换热优化

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摘要

In this study, the equilibrium equation of available potential, which reveals the relation of available potential and local exergy destruction rate, is determined, and the expressions of available potential and local exergy destruction rate are given. To improve heat transfer enhancement and reduce increase amplitude of flow resistance, a method termed as fluid-based heat transfer enhancement is proposed relative to surface-based heat transfer enhancement. An optimal mathematical model by constructing Lagrange function with exergy destruction corresponding to irreversibility loss of heat transfer process and fluid power consumption to flow loss of fluid is adopted to validate this method. To obtain the optimal flow structure in a tube, the tube flow is divided into two parts: core flow and boundary flow. For reducing the irreversibility loss in the core flow, we take fluid exergy destruction as optimization objective with prescribed fluid power consumption. For reducing the flow resistance in the boundary flow, we take fluid power consumption as optimization objective with prescribed fluid exergy destruction. The optimization equations for the convective heat transfer in laminar flow are derived, which are solved numerically. The longitudinal swirling flows in the tube are found at different parameters. In the optimized flow, heat transfer is enhanced greatly while accompanied with a little increase of flow resistance. Comprehensive performance, the ratio of increases in heat transfer and flow resistance, reaches at 3.65 after optimization.
机译：本研究确定了有效势平衡方程，揭示了可用势与局部能级破坏率的关系，并给出了可用势与局部能级破坏率的表达式。为了改善热传递增强并减小流动阻力的增加幅度，相对于基于表面的热传递增强，提出了一种称为基于流体的热传递增强的方法。该方法是通过构造一个拉格朗日函数的最优数学模型来进行验证的，该拉格朗日函数具有与传热过程的不可逆损失以及流体功率消耗对流体的流动损失相对应的火用破坏。为了在管道中获得最佳的流动结构，将管道流动分为两部分：岩心流动和边界流动。为了减少岩心流的不可逆性损失，我们以流体火用破坏为优化目标，并按规定消耗了流体功率。为了减小边界流中的流动阻力，我们将流体功率消耗作为优化目标，并规定了对流体的火用破坏。推导了层流对流换热的优化方程，对其进行了数值求解。管中的纵向旋流在不同的参数下发现。在优化的流动中，传热得到大大增强，同时流动阻力略有增加。优化后，综合性能（传热和流阻增加的比率）达到3.65。

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  • 来源
  • 作者

    Junbo Wang; Zhichun Liu; Fang Yuan; Wei Liu; Gang Chen;

  • 作者单位

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China;

  • 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

    Convective heat transfer; Optimization; Available potential; Local exergy destruction rate;

    机译：对流换热;优化;可用潜力;局部火用破坏率;

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