CAJ | 학술논문

制备了具有不同疏水区宽度和面积分率的疏水-亲水间隔规则排列的组合表面。观测常压蒸汽在组合表面上冷凝时疏水区液滴的特性(液滴移除方式和最大液滴半径)，利用格子Boltzmann方法模拟组合表面上凝液的运动。考察疏水区、亲水区宽度和表面过冷度对组合表面强化蒸汽冷凝传热的影响。利用滴状-膜状组合传热模型分析组合表面蒸汽冷凝传热性能的影响因素，并与实验结果比较。发现疏水区液滴自发地向亲水区定向迁移，精细设计的组合表面可以实现蒸汽滴状冷凝传热的强化，实验中强化因子可达1.20。疏水区宽度约为0.55 mm时组合表面的传热性能最大。表面过冷度越大，组合表面强化传热的效果越差，模型分析与实验结果吻合良好。
제비료구유불동소수구관도화면적분솔적소수-친수간격규칙배렬적조합표면。관측상압증기재조합표면상냉응시소수구액적적특성(액적이제방식화최대액적반경)，이용격자Boltzmann방법모의조합표면상응액적운동。고찰소수구、친수구관도화표면과랭도대조합표면강화증기냉응전열적영향。이용적상-막상조합전열모형분석조합표면증기냉응전열성능적영향인소，병여실험결과비교。발현소수구액적자발지향친수구정향천이，정세설계적조합표면가이실현증기적상냉응전열적강화，실험중강화인자가체1.20。소수구관도약위0.55 mm시조합표면적전열성능최대。표면과랭도월대，조합표면강화전열적효과월차，모형분석여실험결과문합량호。
The hybrid surfaces with hydrophobic and hydrophilic regions arranged regularly and alternatively are prepared. Various widths and area fraction of the hydrophobic region are designed. The droplet properties (such as droplet drainage mode and maximum droplet radius) during steam condensation at atmospheric pressure are visualized. The motion process of condensate on hybrid surfaces is simulated by lattice Boltzmann method. The influences of the widths and surface subcooling of hydrophobic and hydrophilic region on enhancement of the steam condensation heat transfer of the hybrid surfaces are investigated. The influencing factors on the steam condensation heat transfer performance of hybrid surfaces are analyzed and calculated by hybrid condensation heat transfer model. The comparison between model and experimental results is also conducted. It is found that the droplet on the hydrophobic region can spontaneously migrate into the hydrophilic region. The dropwise condensation heat transfer of steam can be effectively enhanced by the finely designed hybrid surfaces. The enhancement factor of the heat transfer performance of the hybrid surface can approach to 1.20. When the width of the hydrophobic region is about 0.55 mm, the heat transfer performance of hybrid surface reaches the maximum. Furthermore, the effect of the heat transfer enhancement of hybrid surfaces decreases with the increase of surface subcooling. The comparison results indicate that the analytical (theoretical) results can well and conveniently <br> predict the experimental results.