Numerical Investigation and Machine Learning-Based Prediction of the Effect of Using Ring Turbulators on Heat Transfer Characteristics in a Counterflow Heat Exchanger

Özgür Solmaz, Eşref Baysal, M. Ökten
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Abstract

Pipe-type heat exchangers are commonly used in industrial applications to facilitate heat transfer between two fluids at different temperatures without mixing them. In this study, turbulators were employed in a counterflow concentric pipe-type heat exchanger. Water at a flow rate of 50 l/h and a temperature of 298.14 K, and air at a temperature of 350 K were directed through the inner pipe. The different stages of circular turbulators placed inside the inner pipe were numerically investigated using the feasible κ-ε turbulence model. Heat transfer characteristics were examined for a turbulator-free heat exchanger and for turbulator-heat exchanger models with helical turbulators of 25, 50, 75, and 100 mm pitch at Reynolds numbers ranging from 4000 to 26000. The governing equations for three-dimensional and turbulent flow conditions in a steady state were solved using a computational fluid dynamics program based on the finite volume method. Temperature distributions and velocity contours in the heat exchanger were generated using the data obtained from numerical analysis. Additionally, predictions were made using artificial neural networks. The results revealed that the highest enhancement in heat transfer, amounting to 233.08% compared to the empty tube case, was achieved with the 25 mm pitch turbulator. The predictions made using artificial neural networks were in good agreement with the numerical analysis results. The designed turbulators for the heat exchanger model promoted turbulent flow, increased the heat transfer area, and led to an improvement in heat transfer.
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使用环形涡轮对逆流换热器传热特性影响的数值研究和基于机器学习的预测
管式热交换器通常用于工业领域,以促进温度不同的两种流体之间的热传递,而无需混合。本研究在逆流同心管式热交换器中使用了涡轮。流量为 50 升/小时、温度为 298.14 K 的水和温度为 350 K 的空气通过内管。使用可行的 κ-ε 湍流模型对放置在内管中的不同阶段的圆形湍流器进行了数值研究。在雷诺数为 4000 到 26000 之间的条件下,研究了无湍流器热交换器和带有 25、50、75 和 100 毫米间距螺旋湍流器的湍流器热交换器模型的传热特性。使用基于有限体积法的计算流体动力学程序求解了稳定状态下三维和湍流条件下的控制方程。利用数值分析获得的数据生成了热交换器中的温度分布和速度等值线。此外,还利用人工神经网络进行了预测。结果显示,与空管情况相比,25 毫米间距的涡轮器实现了最高的热传递增强,达到 233.08%。人工神经网络的预测结果与数值分析结果十分吻合。为热交换器模型设计的涡轮促进了湍流,增加了传热面积,从而改善了传热效果。
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