捲氣效應對液滴與物體表面間非潤濕現象之研究; Investigation of the Nonwetting Effect between the Droplet and the Solid Surface Induced by Gas Flow Motion

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題名:	捲氣效應對液滴與物體表面間非潤濕現象之研究;Investigation of the Nonwetting Effect between the Droplet and the Solid Surface Induced by Gas Flow Motion
作者:	陳志臣
貢獻者:	機械工程學系
關鍵詞:	機械工程類
日期:	2008-07-01
上傳時間:	2010-12-28 14:36:08 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	本計畫將使用數值模擬及實驗方法進行分析，當液滴與物體表面間具有溫度梯度或剪力作用時，氣體捲入液滴與物體表面之間，防止液滴與物體表面接觸，而造成液滴與接觸表面間產生非潤濕效應。物體表面上製造微奈米結構可產生蓮花效應，具高度疏水性現象與表面自潔效果，所以表面結構改變對捲氣效應所造成之非潤濕效應之影響應深入研究。理論分析方面，我們針對各種不同物理條件建立其理論模型，並利用數值方法分析不同情況下，液滴與接觸表面間之流場變化情形，及液滴自由液面形狀之改變，研判非潤濕之機制。瞭解不規則表面所引起氣流改變對非潤濕效應之改變。實驗方面，將建構一個可供給液滴、加熱及平台移動之液滴捲氣分析系統、及觀測之實驗平台。開發能建構大面積微奈米結構之雷射光干涉微影系統。量測液滴與不同材質之平滑表面及微奈米結構表面之接觸特性，以及具有溫度梯度或剪力作用時之接觸特性，並量測單顆不同大小液滴最大承受力量，觀察液滴破裂瞬間的情況。深入瞭解微奈米結構所產生蓮花效應對非潤濕效應之影響。建立能供給多顆液滴及不同分佈形態之系統，探討多顆液滴於平滑或與微奈米結構表面對其承載物體重量之影響。得知液滴受力狀況後，便可利用液滴進行物體的承載。 From this project, we will analyze the phenomenon of the self-lubricated effect which is caused by the temperature gradient or the shear force between a droplet and the solid surface. This self-lubricated gas film can prevent the droplet from contacting the solid surface and result in the non-wetting effect. By fabricating the micro/nano structure on the object』s surface, the lotus effect with superhydrophobic and self-cleanning properties will be revealed on the surface. Therefore, the non-wetting effect of self-lubricated gas film which is caused by altering different surface structure should be investigated intensively. For the theoretical analysis, we construct the basic theoretical models for different kinds of physical conditions. Then, we utilize the numerical simulation to investigate the flow field between a droplet and the solid surface and the deformation at the free surface of the droplet with different situations and look for the mechanism of non-wetting effect. Finding out the changes of non-wetting effect are caused by the variation of surface stucture. For the experiment, we will construct a self-lubricated effect analyzed system which consists of a droplet supplying device, heating and moving stage, and the observing equipment. Developing the laser interferometric lithography system can produce micro/nano structures with large area. We will measure the contact characters between the droplet and smooth or rough solid surface with different materials. Besides, we also measure the contact characters between the droplet and solid surface when there is a temperature gradient or shear force between them. By changing the size of the droplet, we measure the bearing force of a single droplet and observe the phenomenon of the droplet at the instant of breaking. The non-wetting due to lotus effect caused by the micro/nano structures will be studied. We will build up the system that can supply multi-drops and discuss the effects of multi-drops with contacting smooth and micro/nano structure surface. After obtaining the bearing force of the droplet, then we can develop a droplet loading system. 研究期間：9608 ~ 9707
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
顯示於類別:	[機械工程學系] 研究計畫

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