Correlations and shape optimization in a channel with aligned dimples and protrusions
Correlations and shape optimization in a channel with aligned dimples and protrusions
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DOI：
10.1016/j.ijheatmasstransfer.2013.04.055
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发表时间：
2013-09
影响因子：
5.2
通讯作者：
Jonghyeok Lee;Kwan-Soo Lee
中科院分区：
文献类型：
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作者：
Jonghyeok Lee;Kwan-Soo Lee
在这项研究中，摩擦系数和努塞尔数在板式换热器的凹坑和突起进行了调查，根据几何和操作条件。层流区采用定常层流模型，湍流区采用定常SST k-ω湍流模型，计算结果与非定常分析结果吻合较好。为了有效地分析，临界雷诺数的相关性推导出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 μ ReH ≤ 15，000）的努塞尔数和摩擦因数关联式。进行了多目标优化，其中目标函数是归一化努塞尔数和归一化摩擦因子的函数。为了研究最优点随权重因子的变化情况，采用微遗传算法生成Pareto前沿。当JF因子作为单目标函数时，最优点的性能比参考模型提高了28%。最佳点与雷诺数无关。
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–ωturbulence 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 ⩽ ReH⩽ 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. WhenJFfactor 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.