標題: Spatial Control of Heterogeneous Nucleation on the Superhydrophobic Nanowire Array
作者: Lo, Ching-Wen
Wang, Chi-Chuan
Lu, Ming-Chang
機械工程學系
Department of Mechanical Engineering
關鍵字: spatial control;heterogeneous nucleation;superhydrophobic surfaces;Si nanowire arrays
公開日期: 1-三月-2014
摘要: Condensation is a common phenomenon and is widely exploited in power generation and refrigeration devices. Although drop-wise condensation offers high heat and mass transfer rates, it is extremely difficult to maintain and control. In this study, the ability to spatially control heterogeneous nucleation on a superhydrophobic surface by manipulating the free energy barrier to nucleation through parameterizing regional roughness scale on the Si nanowire array-coated surface is reported. Water vapor preferentially condenses on the designed microgrooves on the Si nanowire surface and continuous shedding of the drop-wise condensate is observed on the surface. The nucleation site density can also be manipulated by tailoring the density of the microgroove on the surface. Moreover, the cycle time on the Si nanowire array with microgrooves is approximately ten times smaller than that on a plain Si surface. This suggests that potentially high heat and mass transfer rates can be achieved on the surface. The insight from this study has implications in enhancing energy efficiency in a wide range of thermal energy conversion systems.
URI: http://dx.doi.org/10.1002/adfm.201301984
http://hdl.handle.net/11536/24014
ISSN: 1616-301X
DOI: 10.1002/adfm.201301984
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 24
Issue: 9
起始頁: 1211
結束頁: 1217
顯示於類別:期刊論文


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  1. 000332337000003.pdf