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Entransy expression of the second law of thermodynamics and its application to optimization in heat transfer process

机译：热力学第二定律的熵转化表达及其在传热过程优化中的应用

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摘要

Based on theories of thermodynamics, the energy equation in terms of entransy in heat transfer process is introduced, which not only describes the change of entransy, but also defines the entransy consumption rate. According to the regularity of entransy change in heat transfer process and the effect of entransy consumption rate on the irreversibility of heat transfer process, it can be found that entransy is a state variable, from which a new expression for the second law of thermodynamics is presented. Then by setting entransy consumption rate and power consumption rate as optimization objective and constraint condition for each other, the Lagrange conditional extremum principle is used to deduce momentum equation, constraint equation and boundary condition for optimizing flow field of convective heat transfer, which are applied to simulate convective heat transfer coupling with energy equation in an enclosed cavity. Through the numerical simulation, the optimized flow field under different constraint conditions is obtained, which shows that the principle of minimum entransy consumption is more suitable than the principle of minimum entropy generation for optimizing convective heat transfer process.
机译：在热力学理论的基础上，引入了传热过程中换能的能量方程，不仅描述了换能的变化，而且还定义了换热消耗率。根据传热过程中焓变的规律性和传热消耗率对传热过程不可逆性的影响，可以发现熵是一个状态变量，由此给出了热力学第二定律的新表达式。然后通过将传输消耗率和功耗率作为优化目标和约束条件，拉格朗日条件极值原理推导了动量方程，约束方程和边界条件，以优化对流换热流场，将其应用于在一个封闭的腔中用能量方程模拟对流换热。通过数值模拟，得到了在不同约束条件下的优化流场，表明对流传热过程的最小熵耗原理比最小熵产生原理更合适。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第14期|p.3049-3059|共11页
  • 作者

    W. Liu; Z.C. Liu; H. Jia; A.W. Fan; A. Nakayama;

  • 作者单位

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

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

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

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

    Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan;

  • 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

    entransy irreversibility convective heat transfer optimization;

    机译：换热不可逆对流换热优化;

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