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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Parametric analysis of entropy generation due to laminar developing mixed convection between differentially heated isothermal vertical parallel plates
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Parametric analysis of entropy generation due to laminar developing mixed convection between differentially heated isothermal vertical parallel plates

机译：分层加热等温垂直平行板之间的层流发展混合对流产生的熵的参数分析

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Purpose - The aim of this article is to present the results of a parametric analysis of the entropy generation due to mixed convection in the entry-developing region between two differentially heated isothermal vertical plates. Design/methodology/approach - The entropy generation was estimated via a numerical solution of the mass, momentum and energy conservation equations governing the flow and heat transfer in the vertical channel between the two parallel plates. The resultant temperature and velocity profiles were used to estimate the entropy generation and other heat transfer parameters over a wide range of the operating parameters. The investigated parameters include the buoyancy parameter (Gr/Re), Eckert number (Ec), Reynolds number (Re), Prandtl number (Pr) and the ratio of the dimensionless temperature of the two plates (θ_T). Findings - The optimum values of the buoyancy parameter (Gr/Re) optimum at which the entropy generation assumes its minimum for the problem under consideration have been obtained numerically and presented over a wide range of the other operating parameters. The effect of the other operating parameters on the entropy generation is presented and discussed as well. Research limitations/implications - The results of this investigation are limited to the geometry of vertical channel parallel plates under isothermal boundary conditions. However, the concept of minimization of entropy generation via controlling the buoyancy parameter is applicable for any other geometry under any other thermal boundary conditions. Practical implications - The results presented in this paper can be used for optimum designs of heat transfer equipment based on the principle of entropy generation minimization with particular focus on the optimum design of plate and frame heat exchanger and the optimization of electronic packages and stacked packaging of laminar-convection-cooled printed circuits. Originality/value - This paper introduces the entropy generation minimization via controlling the operating parameters and clearly identifies the optimum buoyancy parameter (GrIRe) at which entropy generation assumes its minimum under different operating conditions.
机译：目的-本文的目的是提出参数熵分析的结果，该参数是由于两个不同加热的等温垂直板之间的入口-发育区域中混合对流引起的熵产生的结果。设计/方法/方法-通过质量，动量和能量守恒方程的数值解来估计熵的产生，该方程控制着两个平行板之间垂直通道中的流动和热传递。所得的温度和速度曲线用于估计在广泛的运行参数范围内的熵产生和其他传热参数。研究的参数包括浮力参数（Gr / Re），埃克特数（Ec），雷诺数（Re），普朗特数（Pr）和两块板的无量纲温度之比（θ_T）。研究结果-通过数值获得了浮力参数（Gr / Re）的最优值，在该最优值下，熵的产生使所考虑的问题最小化，并在其他各种运行参数中得到了体现。还介绍和讨论了其他操作参数对熵生成的影响。研究的局限性/意义-该研究的结果仅限于等温边界条件下垂直通道平行板的几何形状。然而，通过控制浮力参数来最小化熵产生的概念适用于在任何其他热边界条件下的任何其他几何形状。实际意义-基于熵最小化原理，本文中提出的结果可用于传热设备的优化设计，尤其侧重于板框式换热器的优化设计以及电子封装和堆叠式封装的优化层流对流冷却的印刷电路。原创性/价值-本文通过控制运行参数介绍了将熵产生最小化的方法，并清楚地确定了最佳浮力参数（GrIRe），在该参数下，在不同的运行条件下，熵产生取最小值。

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