Abstract The present study focuses on the energy performance, entropy generation, and irreversibility of the use of nanofluid in an industrial Peugeot automobile radiator (size: 250 × 301 × 60.4 mm, channel number: 34 and hydraulic diameter: 1.923 mm) with a louvered fin type. 50:50 EG – water which is widely used in existing automobile radiators and a new generation of EG – water – Al2O3 (0.5%) nanofluid have been compared. In order to examine the effect of variable operating conditions on thermal performance for both fluid mixtures, experiments have been performed at variable air velocity (4–5 m/s), variable coolant flow rate (10–15 – 20 lt/min), and an inlet temperature of 95 °C (real automobile conditions). Thermo-hydraulics calculations such as entropy generation, irreversibility, effectiveness, NTU, heat transfer rate, pumping power have been obtained from experimental data. Among conducted experiments, with increasing coolant flow rate, entropy generation increases on the airside, while decreasing on the coolant side. When the entropy generation due to temperature and pressure difference is compared, entropy production due to pressure difference can be neglected. It has been evaluated that the use of nanofluid increases the heat transfer rate by 9.52%, reducing the irreversibility by about 68% at the 4 m/s air velocity and 10 lt/min coolant flow.

中文翻译：

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汽车散热器纳米流体流动熵产生及能量性能的实验研究

摘要 本研究的重点是纳米流体在工业标致汽车散热器（尺寸：250 × 301 × 60.4 mm，通道数：34 和液压直径：1.923 mm）中使用的能量性能、熵产生和不可逆性。鳍型。对现有汽车散热器中广泛使用的50:50 EG-水与新一代EG-水-Al2O3（0.5%）纳米流体进行了比较。为了检查可变操作条件对两种流体混合物的热性能的影响，在可变空气速度 (4-5 m/s)、可变冷却剂流速 (10-15 - 20 lt/min)、入口温度为 95 °C（实际汽车条件）。热工水力计算，如熵产生、不可逆性、有效性、NTU、传热率、泵浦功率已从实验数据中获得。在进行的实验中，随着冷却剂流速的增加，空气侧的熵产生增加，而冷却剂侧的熵产生减少。当比较由于温度和压差引起的熵产时，压差引起的熵产可以忽略不计。据评估，纳米流体的使用使传热率提高了 9.52%，在 4 m/s 空气速度和 10 lt/min 冷却剂流量下，不可逆性降低了约 68%。由于压差产生的熵可以忽略不计。据评估，纳米流体的使用使传热率提高了 9.52%，在 4 m/s 空气速度和 10 lt/min 冷却剂流量下，不可逆性降低了约 68%。由于压差产生的熵可以忽略不计。据评估，纳米流体的使用使传热率提高了 9.52%，在 4 m/s 空气速度和 10 lt/min 冷却剂流量下，不可逆性降低了约 68%。