Equilibrium Phase Diagram of Drop-on-Fiber: Coexistent States and Gravity Effect

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Title:	Equilibrium Phase Diagram of Drop-on-Fiber: Coexistent States and Gravity Effect
Authors:	Chou,TH;Hong,SJ;Liang,YE;Tsao,HK;Sheng,YJ
Contributors:	化學工程與材料工程學系
Keywords:	LIQUID-DROPS;THIN CYLINDERS
Date:	2011
Issue Date:	2012-03-27 16:27:03 (UTC+8)
Publisher:	國立中央大學
Abstract:	Drop-on-fiber is commonly observed in daily life and is closely related to digital microfluidics. The wetting behavior of droplet-on-fiber is different from that of droplet-on-plane due to the global cylindrical shape. It is generally believed that the equilibrium geometric shape of a droplet on a fiber takes either asymmetric clam-shell or axisymmetric barrel conformation in the absence of gravity. The barrel-to-clam-shell transition is determined by the stability condition. Nonetheless, experimental observations showed that both barrel and clam-shell conformations can coexist in some situations and thus indicated the existence of the multiple stable states. In this Article, the phase diagrams of droplet-on-fiber, that is, the plots of droplet volume against contact angle, are established on the basis of the finite-element simulation (Surface Evolver). When the gravity effect is absent, there are three regimes including barrel, clam-shell, and coexistence of barrel and clam-shell. As the gravity effect is considered, there exist three regimes, including (I) downward clam-shell, (II) coexistence of barrel and dam-shell, and (III) falling-off.
Relation:	LANGMUIR
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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