【摘要】：對冷水滴撞擊不同表面時的動力學行為和相變過程進行了模擬。通過耦合VOF和Level-set方法追蹤氣液自由界面,結合焓-孔隙度相變模型,模擬水滴撞擊冷表面的動力學行為及相變特征。選取親水(接觸角30°)、疏水(接觸角114°)和超疏水(接觸角163°)3種典型浸潤性的表面,計算了多種壁溫條件下的水滴撞擊結冰過程。結果表明提高表面疏水性,將減小水滴與冷表面的接觸時間和接觸面積,降低水滴內(nèi)的相變速率,延緩水滴結冰的時間。在表面溫度高于-15℃時,超疏水表面可以避免冷水滴的凍結黏附,保持表面潔凈。將模擬得到的最大鋪展直徑、回縮速率以及凍結情況,與已有實驗結果進行對比驗證,表明了模擬方法的有效性和準確性。
[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 擄), hydrophobic (contact angle 114 擄) and superhydrophobic (contact angle 163 擄) 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，

本文編號：2298753