| Citation: | WANG Yubing, ZHANG Dalin, Zhan Hongbo, et al. Investigation on flow boiling characteristics in mini channels of typical discrete fin[J]. Journal of Aerospace Power, 2025, 41（X）：20250344 doi: 10.13224/j.cnki.jasp.20250344
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Mini channels with micro pin fins are engineerable heat sinks that can address the high heat flux dissipation for aerospace cooling systems. An experimental investigation of R134a flow boiling heat transfer was conducted in mini channels with circular, square, diamond, and sinusoidal fins, all of which had a hydraulic diameter of 0.67 mm. The experimental parameters covered a dryness range of 0 to 1, mass flux rates ranging from 150 to 300 kg/(m2·s), and heat flux between 10 and 25 kW/m2. Results indicated that both the flow boiling pressure drop and the heat transfer coefficient in mini channels increased with higher mass flux and heat flux. A comparative analysis revealed that fin shape had a more pronounced effect on the pressure drop than on the heat transfer coefficient. e.g., when the mass flux was 150 kg/(m2·s) and the heat flux density was 10 kW/m2, the pressure drops of square, circular, and sinusoidal fins were approximately 272.4%, 116.9%, and 48.7% higher than those of diamond-shaped fins, while the average boiling heat transfer coefficients only increased by 20.6%, 11.0%, and 2.7% compared with diamond-shaped fins. When the mass flux was 300 kg/(m2·s) and the heat flux density was 25 kW/m2, the pressure drops of square, circular, and sinusoidal fins rose by 351.1%, 121.1%, and 94.7% in contrast to diamond-shaped fins, and their average boiling heat transfer coefficients went up by about 24.7%, 11.0%, and 8.8%, respectively, in relative to diamond-shaped fins. Based on the experimental test data, the prediction correlation for discrete fin microchannel flow boiling pressure drop and heat transfer was revised, and a comparative analysis of the overall performance of different fins was carried out. The results demonstrated that diamond-shaped fins had superior overall performance.
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