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首页> 外文期刊>Journal of Heat Transfer >A Revision of the Classical Performance Extended Surfaces Assessment: Proposed New Coefficients
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A Revision of the Classical Performance Extended Surfaces Assessment: Proposed New Coefficients

机译：经典性能扩展曲面评估的修订：建议的新系数

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摘要

After a study of the conceptual and application characteristics of currently used extended surfaces indicators, in a general analysis of fin-wall systems, the characteristics that must be fulfilled by an ideal coefficient have been detailed. With these in mind, thermal reverse admittance, specific reverse admittance and relative reverse admittance are proposed as new performance indicators for the analysis of extended surfaces under any hypothesis, especially time-dependent processes. These new coefficients, for their generality and precision, outmatch the currently used performance coefficients; the last two are also linked to the concept of system optimization. Thermal reverse admittance, which allows us to know the dissipated heat once the temperature gradient between fluids is known, is an absolute scaling factor of fin-wall assemblies; specific reverse admittance is a measure of efficient use of material for heat transfer task; and relative reverse admittance provides information as to the margin of improvement in fin design. Finally, a straight fin-wall system has been analyzed as an example of how the new coefficients can be applied. Their superiority over other coefficients is demonstrated. Network Simulation Method is especially suitable for the direct and accurate numerical determination of the proposed coefficient without using special mathematical developments. Although initially developed for extended surfaces, the thermal reverse admittance and derived coefficients could be applied to the analysis of other thermal systems.
机译：在研究了当前使用的扩展表面指示器的概念和应用特性之后，在对翅片墙系统的一般分析中，详细说明了理想系数必须满足的特性。考虑到这些，提出了热反向导纳，比反向导纳和相对反向导纳，作为在任何假设（尤其是时间依赖的过程）下分析扩展表面的新性能指标。这些新系数，就其通用性和精确度而言，已经超过了当前使用的性能系数；最后两个也与系统优化的概念相关联。反向热导率是鳍壁组件的绝对比例系数，它使我们能够在已知流体之间的温度梯度后知道所散发的热量。特定的反向导纳是衡量材料有效用于传热任务的一种手段；相对反向导纳提供了有关鳍设计改进幅度的信息。最后，已经分析了直翅片壁系统作为如何应用新系数的示例。证明了它们相对于其他系数的优越性。网络仿真方法特别适合直接和准确地对所建议系数进行数值确定，而无需使用特殊的数学方法。尽管最初是为扩展表面而开发的，但热反向导纳和导出的系数可以应用于其他热系统的分析。

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