本文選題：超疏水　切入點(diǎn)：冷表面　出處：《化工學(xué)報(bào)》2017年06期

【摘要】：對(duì)直徑2.8 mm的液滴撞擊冷表面的動(dòng)態(tài)行為進(jìn)行快速可視化觀測(cè),對(duì)比研究單液滴撞擊普通冷表面以及超疏水冷表面的動(dòng)力學(xué)特性,同時(shí)對(duì)初始撞擊速度以及冷表面溫度對(duì)液滴動(dòng)態(tài)演化行為的影響進(jìn)行了對(duì)比分析。實(shí)驗(yàn)結(jié)果表明:與液滴撞擊普通冷表面(溫度-25~-5℃)發(fā)生瞬時(shí)凍結(jié)沉積相比,液滴撞擊超疏水冷表面時(shí)均未發(fā)生凍結(jié),而且伴隨鋪展、回縮、反彈以及破碎行為;撞擊速度越大,普通冷表面上液滴鋪展因子越大,而且液滴越易凍結(jié)。液滴低速(We≤76)撞擊超疏水冷表面會(huì)發(fā)生反彈現(xiàn)象,但速度對(duì)液滴最大鋪展時(shí)間無(wú)影響;液滴高速(We≥115)撞擊超疏水冷表面后會(huì)產(chǎn)生明顯液指,而且破碎為多組衛(wèi)星液滴。此外,冷表面溫度僅影響液滴反彈高度,對(duì)液滴最大鋪展因子以及液滴鋪展時(shí)間影響較小。結(jié)果表明超疏水表面可顯著抑制液滴撞擊冷表面的瞬時(shí)凍結(jié)沉積。
[Abstract]:The dynamic behavior of droplet impinging on cold surface with diameter of 2.8 mm was observed rapidly and visualized, and the dynamic characteristics of single droplet impact on common cold surface and superhydrophobic surface were compared and studied.The effects of the initial impact velocity and the cold surface temperature on the dynamic evolution behavior of the droplet were compared and analyzed.The experimental results show that, compared with the transient freezing deposition of droplets on common cold surfaces (temperature -25 ~ 5 鈩，

本文編號(hào)：1693954