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首页> 外文期刊>International Journal of Heat and Mass Transfer >Correlations and shape optimization in a channel with aligned dimples and protrusions
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Correlations and shape optimization in a channel with aligned dimples and protrusions

机译：凹痕和突起对齐的通道中的相关性和形状优化

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摘要

In this study, the friction factor and Nusselt number in a plate heat exchanger with dimples and protrusions were investigated according to geometric and operating conditions. The numerical results of a steady-state laminar model for the laminar region and a steady-state SST (shear stress transport) k-ω turbulence model for the turbulent region were in good agreement with an unsteady analysis. For efficient analysis, a correlation for the critical Reynolds number was derived as a function of the geometric parameters. Based on these results, Nusselt number and friction factor correlations applicable to various geometric parameters and operating conditions (500 ≤ Re_H ≤ 15,000) were obtained. Multi-objective optimization was carried out, where the objective function was a function of the normalized Nusselt number and normalized friction factor. To investigate the variation of the optimal points according to weighting factors, a Pareto front was generated using a micro-genetic algorithm. When JF factor was used as a single-objective function, the performance of the optimal point was enhanced by 28% compared with that of the reference model. The optimal point was independent of the Reynolds number.
机译：在这项研究中，根据几何和工作条件研究了带有凹痕和凸起的板式换热器中的摩擦系数和Nusselt数。层流区域的稳态层流模型和湍流区域的稳态SST（剪切应力传递）k-ω湍流模型的数值结果与非稳态分析非常吻合。为了进行有效的分析，推导了临界雷诺数的相关性，作为几何参数的函数。基于这些结果，获得了适用于各种几何参数和操作条件（500≤Re_H≤15,000）的努塞尔数和摩擦系数的相关性。进行了多目标优化，其中目标函数是归一化的努塞尔数和归一化的摩擦系数的函数。为了研究最佳点根据加权因子的变化，使用微遗传算法生成了帕累托前沿。当JF因子用作单目标函数时，与参考模型相比，最佳点的性能提高了28％。最佳点与雷诺数无关。

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