Citation: LIU Tian-Qing, SUN Wei, SUN Xiang-Yu, AI Hong-Ru. Mechanism and Condition Analysis of Condensed Drop Jumping on Super-Hydrophobic Surfaces[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1206-1212. doi: 10.3866/PKU.WHXB201202293 shu

Mechanism and Condition Analysis of Condensed Drop Jumping on Super-Hydrophobic Surfaces

1.
School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China

Received Date: 28 November 2011
Available Online: 29 February 2012
Fund Project: 国家自然科学基金(50876015)资助项目 (50876015)

The initial shape of a coalesced drop is determined by the conservation of drop volume and the surface free energy before and after two or more condensed drops merge. The coalesced drop is in a metastable state with a driving force to reduce its base radius toward equilibrium state. This driving force and resistance on the three-phase contact line (TPCL) are analyzed during drop transformation. A dynamic equation describing the shape conversion of the drop is proposed and solved. The jumping height of a merged drop is determined by the speed at which the center of gravity moves up when the base radius of the drop reduces to 0 mm on a super-hydrophobic surface. Calculations show that a coalesced drop on a flat surface can transform its shape only in a limited fashion. It will not jump since its transformation stops before it reaches equilibrium. A wetted drop on a rough surface is even more difficult to transform and jump because of the greater TPCL resistance. However, on a two-tier surface, a partially wetted drop impaling only the micro-scale roughness exhibits a shape transition to a Cassie state upon coalescence, but without obvious jumping. Only after the coalescence of two or more small Cassie-state drops on a textured surface, can the merged composite drop easily transform to a 0 mm base radius and jump. It can be concluded that key factors verning condensed-drop jumping are the merged composite drop in a metastable state and a small TPCL resistance on nano or micro-nano two-tier surfaces.
- Super-hydrophobic surface,
- Nano,
- Micro-nano two-tier texture,
- Condensation,
- Drop transformation,
- Jumping,
- Mechanism,
- Model
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