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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical simulation of cooling performance of an exhaust gas recirculation (EGR) cooler using nano-fluids
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Numerical simulation of cooling performance of an exhaust gas recirculation (EGR) cooler using nano-fluids

机译：使用纳米流体的废气再循环（EGR）冷却器冷却性能的数值模拟

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摘要

A numerical model is developed to predict the performance of an exhaust gas recirculation (EGR) cooler using nanofluid as the coolant. The model accounts for turbulent flow of coolant and hot smokes on an integrated computational domain. Thermal and hydrodynamic behavior of four nanofluids comprising water as the base fluid and SiO2, TiO2, Al2O3 and Cu nanoparticles, were compared over a wide range of Reynolds numbers and various particle concentrations. The accuracy of predictions was verified by experimental' data available in the literature. The Al2O3 - ater nanofluid was found to provide the greatest heat transfer enhancement. Quantitatively, Al2O3 - water nanofluid with a volume fraction of 5% and Reynolds number of 5000 improves the heat transfer coefficient by about 16% compared to pure water. However, it was found that the heat transfer enhancement was achieved at the expense of increased pressure drop due to greater viscosity of nanofluids compared to the base fluid. It was also found that the effectiveness of nanofluids in improving the heat transfer rate decreases as the Reynolds number increase. (C) 2016 Elsevier Ltd. All rights reserved.
机译：建立了一个数值模型来预测使用纳米流体作为冷却剂的废气再循环（EGR）冷却器的性能。该模型在集成的计算域中考虑了冷却剂和热烟的湍流。在宽范围的雷诺数和各种颗粒浓度下，比较了四种纳米流体的热和流体力学行为，这些流体包括水作为基础流体以及SiO2，TiO2，Al2O3和Cu纳米颗粒。通过文献中提供的实验数据验证了预测的准确性。发现Al 2 O 3-埃特纳米流体提供最大的传热增强。从数量上看，Al2O3-水纳米流体的体积分数为5％，雷诺数为5000，与纯水相比，传热系数提高了约16％。然而，发现与纳米流体相比，由于纳米流体的粘度更高，因此以增加的压降为代价实现了传热的增强。还发现随着雷诺数的增加，纳米流体改善传热速率的有效性降低。 （C）2016 Elsevier Ltd.保留所有权利。

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