碳奈米膠囊添加劑潤滑油液滴撞擊之實驗研究

Experimental study of impacting of lubricating oil droplets with carbon nano-capsule additive

蘇雅君(Ya -Jun Su)

指導教授 ： 黃社振

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2010年)

摘要

本研究主要目的在於利用氣體電弧放電設備，以粉末冶金碳棒放電製備之新型碳奈米膠囊，因其特殊石墨結構，使具有熱傳導性、導電性和強度佳與化學穩定性等優點。將其加入潤滑油做為混合液滴來撞擊固體表面以探討其行為。
液滴撞擊表面可分為擴展、回縮及最後穩定階段。本實驗研究將以高速攝影所擷取之瞬間影像深入探討液滴撞擊三維表面，將依不同加工方式、不同表面粗糙度、和不同溫度下，探討碳奈米膠囊潤滑油液滴撞擊金屬表面行為。由實驗結果可得知：(1)不同材料對液滴之擴散也有所不同，其中以鋁材對液滴擴散直徑影響較大，其次為銅和鐵。(2)不同加工表面在相同粗糙度情況下，高度峰度較高會使的液滴擴散直徑變小，實驗結果以端銑加工之擴散直徑較磨削加工大。(4)粗糙度越大，擴散直徑越小；溫度升高使的液滴表面張力降低，因此擴散直徑會變大，溫度越高表面粗糙度越大，液滴擴散形狀會越不規則。(5)新型碳奈米膠囊添加劑潤滑油液滴擴散情況較基礎油好。

關鍵字：碳奈米膠囊、液滴碰撞、三維表面粗糙度、擴散直徑、表面溫度

關鍵字

碳奈米膠囊 ； 液滴碰撞 ； 三維表面粗糙度 ； 擴散直徑 ； 表面溫度

並列摘要

Abstract

The main purpose of this study is to use the gas arc discharge devices to discharge powder preparation of a new nano-capsule, because of their special graphite structure, good heat conduction properties, electrical properties and chemical stability, etc. Therefore, adding oil as a mixed droplet impact a solid surface to explore its behavior.
Droplet impact surface can be divided into expansion, retraction, and the final stable stage. This experimental study will pick up the instantaneous phantom thorough discussion. Droplet impact three dimensional surfaces by the high-speed photography. Will depend on the different processing way, the different surface roughness, and under the different temperature, discusses the carbon nano-capsule lubricating oil droplet impact metal surface behavior separately.Experimental results show that: (1) the diffusion of droplets of different materials are also different, in which aluminum greater impact on the droplet spread diameter, followed by copper and iron. (2) different processing on the diffusion patterns also affect the roughness in the same roughness, a high degree of kurtosis higher droplet spread diameter will become smaller, the experimental results to the diffusion milling spread diameter is large than the grinding. (4) The roughness of the larger diameter of the smaller diffusion; the droplet temperature to reduce surface tension, so diffusion becomes large diameter, the greater the higher the temperature, surface roughness, the more irregular shape of droplet spread. (5) new carbon nano lubricant additives capsule drops is the spread better than the base oil.

Keywords: Nano-capsule、Droplet collision、3D surface roughness、Spread diameter、Surface temperature

並列關鍵字

Nano-capsule ； Droplet collision ； 3D surface roughness ； Spread diameter ； Surface temperature

參考文獻

參考文獻

[1] A. M. Worthington, “On the Forms Assumed by Drops of Liquids FallingVertically on a Horizontal Plate,” Proc. R. Soc. London A, Vol. 25,1867, pp.261-271.

[2] A. M. Worthington, “On Impact with a Liquid Surface,” Proc. R. Soc. London A, Vol. 34, 1883, pp. 217-230.

[3] A. M. Worthington, “A Study of Splashes,” London: Longman and Green,1908; reprinted, New York: Macmillian, 1963.

[4] Shai Rahimi, Daniel Weihs, “Experimental investigation of magneto-rheological droplet impact on a smooth surface,” Journal of Magnetism and Magnetic Materials, Volume 321, Issue 19, October 2009, Pages 3178-3182