不同浸润性冷表面上水滴碰撞结冰的数值模拟
发布时间：2018-10-29 20:38
【摘要】：对冷水滴撞击不同表面时的动力学行为和相变过程进行了模拟。通过耦合VOF和Level-set方法追踪气液自由界面,结合焓-孔隙度相变模型,模拟水滴撞击冷表面的动力学行为及相变特征。选取亲水(接触角30°)、疏水(接触角114°)和超疏水(接触角163°)3种典型浸润性的表面,计算了多种壁温条件下的水滴撞击结冰过程。结果表明提高表面疏水性,将减小水滴与冷表面的接触时间和接触面积,降低水滴内的相变速率,延缓水滴结冰的时间。在表面温度高于-15℃时,超疏水表面可以避免冷水滴的冻结黏附,保持表面洁净。将模拟得到的最大铺展直径、回缩速率以及冻结情况,与已有实验结果进行对比验证,表明了模拟方法的有效性和准确性。
[Abstract]:The kinetic behavior and phase transition process of cold water droplets impacting different surfaces were simulated. The coupled VOF and Level-set methods were used to track the gas-liquid free interface and the enthalpy porosity model was used to simulate the kinetic behavior and phase transition characteristics of the water droplet impacting the cold surface. The hydrophilic (contact angle 30 掳), hydrophobic (contact angle 114 掳) and superhydrophobic (contact angle 163 掳) surfaces are selected to calculate the ice forming process of water droplets under various wall temperature conditions. The results show that increasing surface hydrophobicity will reduce the contact time and contact area between the droplet and the cold surface, decrease the phase transition rate in the droplet, and delay the freezing time of the water droplet. When the surface temperature is higher than-15 鈩，
本文编号：2298753
[Abstract]:The kinetic behavior and phase transition process of cold water droplets impacting different surfaces were simulated. The coupled VOF and Level-set methods were used to track the gas-liquid free interface and the enthalpy porosity model was used to simulate the kinetic behavior and phase transition characteristics of the water droplet impacting the cold surface. The hydrophilic (contact angle 30 掳), hydrophobic (contact angle 114 掳) and superhydrophobic (contact angle 163 掳) surfaces are selected to calculate the ice forming process of water droplets under various wall temperature conditions. The results show that increasing surface hydrophobicity will reduce the contact time and contact area between the droplet and the cold surface, decrease the phase transition rate in the droplet, and delay the freezing time of the water droplet. When the surface temperature is higher than-15 鈩，
本文编号：2298753
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