Full
Outline
To improve the design accuracy of microchannel oil coolers，numerical calculations and experimental studies on flow and heat transfer of oil in airfoil‑channel printed circuit heat exchangers （PCHE） were conducted，focusing on the impact of oil inlet temperature and flow velocity on the flow resistance and heat transfer performance of the heat exchanger.Empirical correlations for Nu and f of oil in airfoil channels were fitted.The results show that the maximum error between numerical calculations and experimental results is within 20%，indicating the reliability of the numerical model.Flow velocity is a key factor affecting the thermal‑side Nuh，while temperature has a weaker influence.Within the studied operating range，increasing the flow velocity from 0.2 m/s to 1 m/s raises Nuh by approximately 78%，whereas a temperature increase of 10 K only changes Nuh by 0.1~0.2.Both temperature and flow velocity significantly affect pressure drop.Thermal‑side pressure drop is positively correlated with oil inlet flow velocity，increasing by 270%~300% as flow velocity rises from 0.2 m/s to 1 m/s.When the thermal‑side inlet flow velocity is constant，pressure drop decreases with rising oil temperature.A temperature increase of 10 K reduces pressure drop by 8 460~48 800 Pa.The maximum errors of the fitted empirical correlations for Nu and f are 6.23% and 11.68%，respectively.The research results provide a theoretical basis for the accurate design of microchannel oil coolers.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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