本文關(guān)鍵詞： 微通道 潤濕性 疏水壁面 單側(cè)速度滑移 雙側(cè)速度滑移 阻力　出處：《表面技術(shù)》2017年06期 　論文類型：期刊論文

【摘要】：目的降低微通道的流動阻力。方法借助激光加工、自組裝技術(shù)和化學(xué)涂覆技術(shù),在Si基底上制備了3種不同潤濕性的表面,通過組裝獲得具有不同潤濕性壁面的微通道。采用微觀粒子成像測速技術(shù)(μ-PIV),對構(gòu)建的微通道單側(cè)滑移流動和雙側(cè)滑移流動進行測試。結(jié)果 Si表面沉積自組裝分子膜、微結(jié)構(gòu)加工結(jié)合自組裝分子膜沉積及構(gòu)筑微結(jié)構(gòu)后,進行納米二氧化硅涂覆的接觸角分別為114.6°、142.7°和155.4°。親水壁面A與疏水壁面B、C和超疏水壁面D組成的微通道,B、C和D壁面的滑移速度分別為0.018、0.022、0.029 m/s。B-D通道的平均流速比B-C通道提高了0.85%,C-D通道的平均流速比C-C通道提高了5.25%。結(jié)論疏水壁面處均存在較明顯的滑移速度,且壁面疏水性越強,滑移速度越大。當兩側(cè)壁面均為疏水壁面時,一側(cè)壁面疏水性的提高可以增加另一側(cè)壁面疏水性對整體減阻效果的影響,但會迫使另一側(cè)疏水壁面的滑移速度減小。流場中最大速度位置會偏向疏水性較強的一側(cè)壁面,且兩側(cè)壁面潤濕性的差距越大,其偏離距離越大。
[Abstract]:Objective to reduce the flow resistance of microchannels. Methods three kinds of wettable surfaces were prepared on Si substrates by laser processing, self-assembly and chemical coating techniques. The microchannels with different wettable wall surfaces were assembled and measured by microparticle imaging velocimetry (渭 -PIVN). The single and bilateral slip flows of the constructed microchannels were measured. Results the self-assembled molecular films were deposited on the Si surface. After microstructural processing combined with the deposition of self-assembled molecular films and the construction of microstructures, The contact angles of nano-silica coating were 114.6 擄/ 142.7 擄and 155.4 擄respectively. The slip velocities of the hydrophilic wall A and the hydrophobic wall B _ (C) and the superhydrophobic wall D were 0.018 ~ 0.022 ~ 0.022 ~ 0.029 m / s. B-D channel respectively. The average flow velocity of 0.85 and C-D channel was increased 5.25% than that of C-C channel. Conclusion there is a significant slip velocity on the hydrophobic wall. When both sides are hydrophobic, the increase of hydrophobicity on one side can increase the effect of hydrophobicity on the overall drag reduction. However, the slip velocity on the other side of the hydrophobic wall will be reduced. The maximum velocity position in the flow field will be inclined to the wall with strong hydrophobicity, and the larger the wettability gap between the two sides is, the greater the deviation distance will be.
【作者單位】： 大連海事大學(xué);清華大學(xué);
【基金】：國家自然科學(xué)基金(51275064,50975036)~~
【分類號】：TB306

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