| Citation: | Zhang Jiayu, Wang Kun, Wang Yunxiao, et al. Experimental study on micro-channel bare tube heat exchanger in high-altitude and low-pressure environment[J]. Journal of Aerospace Power, 2026, 41（10）：20240806 doi: 10.13224/j.cnki.jasp.20240806
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To explore the influence of high-altitude low-pressure environment on the convective flow and heat transfer characteristics of air-cooled heat exchanger, a low-pressure convective heat transfer experimental wind tunnel was established. The wind tunnel operated within a pressure range of 5.5 to 101.3 kPa and a flow rate range of 0 to 13.6 m/s. The flow and heat transfer characteristics of micro-channel bare tube heat exchanger at 12—20 km altitude were studied experimentally and numerically. The results indicate that when the Reynolds number is less than 100, the existing correlations underpredict the friction factor. And when the Reynolds number is less than 40, the Nusselt number is overpredicted. The maximum relative deviation of the Zukauskas correlation for Nusselt number is 72.4%. Additionally, due to the low volumetric heat capacity of airflow, the increase of tube rows significantly weakens the average convective heat transfer coefficient, thereby increasing the heat transfer prediction deviation of the Zukauskas correlation. Consequently, a new correlation was established, which significantly improves the prediction accuracy in the low Reynolds number range, and considers the influence of the number of tube rows on heat transfer. The relative deviation between the prediction of friction coefficient and Nusselt number and the experimental data is within 10%.
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