润湿性梯度表面喷雾冷却流动换热特性  

Heat transfer characteristics of wettability gradient surfaces in spray cooling

作　　者：常静毅 陈振乾[1] 许波[1] CHANG Jingyi;CHEN Zhenqian;XU Bo(School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《航空动力学报》2025年第1期111-119,共9页Journal of Aerospace Power

基　　金：国家自然科学基金青年科学基金(52006031)。

摘　　要：采用组分输运模型、discrete phase model(DPM)和欧拉壁面液膜模型对加热条件下圆环形化学图案改性表面上的喷雾冷却流动换热特性进行了数值模拟。通过对比4种改性表面的液膜厚度、液膜流速、表面温度不均匀性和平均表面传热系数的变化研究了润湿性梯度对表面流动换热特性的影响。结果表明:润湿性梯度表面的换热性能优于均匀润湿性表面,可以促进排液,优化液体管理。润湿性梯度大的表面,液膜流速快、液膜厚度小,疏水表面的排液效果可能优于亲-疏水混合表面,但通过疏水促进成核和亲水延缓干涸的良好设计,亲-疏水混合表面的换热性能最好,并且能够改善表面温度不均匀性。增加润湿性数量和增大梯度,可强化换热。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.

关 键 词：喷雾冷却 改性表面 润湿性梯度 排液 传热 

分 类 号：V243[航空宇航科学与技术—飞行器设计] TK124[动力工程及工程热物理—工程热物理]