河北工业科技2018，Vol.35Issue(3)：164-170,7.DOI:10.7535/hbgykj.2018yx03003
液滴在纳米结构表面上的传热与生长模型
Heat transfer and growth model of droplet on nano-structured surface
摘要
Abstract
In the field of heat transfer,dropwise condensation has high heat transfer performance,which is several times higher than that of filmwise condensation.If dropwise condensation can be realized in industrial production,the required effective heat exchange area will be greatly reduced,which will inevitably produce huge economic benefits.In order to improve the heat trans-fer performance of the equipment,save energy and raw materials,the process of droplet condensation heat transfer using bionic superhydrophobic surface is studied.the wetting state is analyzed and the two growth modes of the droplet are studied by estab-lishing the condensation heat transfer model of a single droplet.The two modes are increasing the bottom contact area with con-stant contact angle and increasing the contact angle with constant bottom diameter,respectively.Then the mathematical model of the droplet growth is obtained according to the two modes,and the influencing factors of the droplet growth mode are ana-lyzed.It is found that when the droplet grows according to the CCA mode,the radius of the growth rate is positively correlated with thermal conductivity of nanocone and tip size,but negatively correlated with height and spacing,and the contact angle shows stages influencing on it.That is,whenθ<90°,it has a negative correlation,while if not,it has a positive correlation.When the droplet grows in accordance with the mode of CB,unlike the CCA mode,its growth rate is negatively correlated with contact angle.Combined with the two growth modes of droplets,the influence of contact angle is the most significant.The fitting experiments show that the theoretical model established in this paper is in good agreement with the experimental data basically,and provides theoretical reference for optimizing the nanocone structure surface.关键词
化工热力学/冷凝传热模型/润湿状态/生长模式/纳米锥表面/生长速率/接触角Key words
chemical thermodynamics/condensation heat transfer model/wetting state/growth mode/nanocones surface/growth rate/contact angle分类
通用工业技术引用本文复制引用
肖璇,范学良..液滴在纳米结构表面上的传热与生长模型[J].河北工业科技,2018,35(3):164-170,7.基金项目
国家自然科学基金(51406128) （51406128）
