| Citation: | CHANG Jingyi, CHEN Zhenqian, XU Bo. Heat transfer characteristics of wettability gradient surfaces in spray cooling[J]. Journal of Aerospace Power, 2025, 40（1）：20230094 doi: 10.13224/j.cnki.jasp.20230094
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The species transport model, discrete phase model (DPM) and Eulerian wall film model were used to simulate the heat transfer characteristics of the spray cooling on circular chemically patterned modified surfaces under uniform heating conditions. The effect of wettability gradient on heat transfer performance on surfaces was studied by comparing four modified surfaces’ liquid film thickness, liquid film flow rate, surface temperature inhomogeneity and average surface heat transfer coefficient. The results showed that the heat transfer performance of the wettability gradient surfaces was better than that of uniformly wet table surfaces, which can promote the liquid drainage and optimize the liquid management. Surfaces with large wettability gradients had faster liquid film flow rate and smaller liquid film thickness, and hydrophobic surfaces may have better liquid drainage than hydrophilic-hydrophobic hybrid surfaces, yet hydrophilic-hydrophobic hybrid surfaces had the best heat transfer performance through a good hydrophobic design to promote nucleation and hydrophilic performance to retard drying, and can improve surface temperature inhomogeneity. Increasing the number of wettability and increasing the gradient can enhance the heat transfer.
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