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首页> 外文期刊>Journal of enhanced heat transfer >EXPERIMENTAL STUDY OF THE THERMOHYDRAULIC PERFORMANCE OF WATER/ETHYLENE GLYCOL-BASED GRAPHITE NANOCOOLANT IN VEHICLE RADIATORS
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EXPERIMENTAL STUDY OF THE THERMOHYDRAULIC PERFORMANCE OF WATER/ETHYLENE GLYCOL-BASED GRAPHITE NANOCOOLANT IN VEHICLE RADIATORS

机译：水/乙烯乙二醇基石墨纳米冷却剂在汽车散热器中热力学性能的实验研究

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摘要

Water/ethylene glycol (W/EG) mixture is a common heat transfer fluid in vehicle radiators that exhibits poor thermal performance. It can be substituted by nanocoolants (nanofluids as coolant) to enhance the overall heat transfer performance of radiators. However, addition of nanoparticles to enhance heat transport may be accompanied by a simultaneous increase in pumping power. In the present study, an experimental evaluation of thermohydraulic performance of graphite nanocoolant (W/EG-based graphite nanofluid as coolant) in vehicle radiators is carried out by utilizing an in-house test rig. The thermal performance of the nanocoolant and the base fluid is compared at the same Reynolds numbers, coolant mass flow rates, and pumping power. The overall heat transfer coefficient is augmented with the use of a nanocoolant, while comparing with the same Reynolds number and coolant flow rate criteria. The enhancement is higher at lower air and coolant mass flow rates and gradually decreases as the flow rates increases. The same pumping power comparisons demonstrate that for low pumping power cases the overall heat transfer coefficient of the nanocoolant is higher than the base fluid, and the trend converses as the pumping power increases to higher values. The performance index, which indicates the net enhancement or diminution of thermal performance relative to the pumping power, is relatively more for graphite nanocoolant at lower coolant and air mass flow rates but diminishes in experiments with higher flow rates. This study shows that an analysis for finding the sweet spot is essential before applying graphite nanocoolant in vehicle radiators.
机译：水/乙二醇（W / EG）混合物是车辆散热器中常见的传热流体，表现出较差的热性能。可以用纳米冷却剂（纳米流体作为冷却剂）代替，以增强散热器的整体传热性能。然而，添加纳米颗粒以增强热传递可能伴随着泵浦功率的同时增加。在本研究中，利用室内试验台对汽车散热器中的石墨纳米冷却剂（W / EG基石墨纳米流体作为冷却剂）的热工性能进行了实验评估。在相同的雷诺数，冷却剂质量流量和泵浦功率下，比较了纳米冷却剂和基础流体的热性能。与相同的雷诺数和冷却剂流量标准相比，使用纳米冷却剂可提高总传热系数。在较低的空气和冷却剂质量流量下，增强效果更高，并且随着流量增加而逐渐降低。相同的泵送功率比较结果表明，对于低泵送功率情况，纳米冷却剂的总传热系数高于基础流体，并且随着泵送功率增加到较高值，趋势相反。性能指数表示热性能相对于泵浦功率的净增强或减弱，对于石墨纳米冷却剂，在较低的冷却剂和空气质量流量下相对较多，但在较高流量的实验中却有所减少。这项研究表明，在汽车散热器中使用石墨纳米冷却剂之前，对寻找最佳位置的分析至关重要。

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