Droplet movement on a vertical gradient surface

Tzong-Shyng Leu, Tseng Hsin Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This research studies the improvement of droplet movement on a vertical surface. Silicon substrates fabricated with different surface tension gradients are used to enhance heat transfer efficiency in a vapor condensing system. Experimental results find that the heat transfer efficiency of gradient surface with strip width C=1mm can be 10% higher than a hydrophilic surface. The mechanism for the gradient surface is also studied by both theoretical and experimental methods. A characteristic length scale Lc, defined as Lc = √γ/ρg where γ, ρ and g represent the liquid surface tension coefficient, liquid density and gravity, is found in the system. When the gradient surface length scale C is much higher than the length scale Lc the system can be considered as an only gravity driven system. When length scale C of the gradient surface is smaller than or equals to the length scale Lc, the surface tension gradient driven force becomes dominant force in the system. It is found that C=1mm gradient surface can cause smaller droplets to move and it is believed this is the major mechanism responsible for the better heat transfer efficiency.

Original languageEnglish
Title of host publication3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2008
Pages641-646
Number of pages6
DOIs
Publication statusPublished - 2008 Sep 1
Event3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2008 - Sanya, China
Duration: 2008 Jan 62008 Jan 9

Publication series

Name3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS

Other

Other3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2008
CountryChina
CitySanya
Period08-01-0608-01-09

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Leu, T-S., & Wu, T. H. (2008). Droplet movement on a vertical gradient surface. In 3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2008 (pp. 641-646). [4484413] (3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS). https://doi.org/10.1109/NEMS.2008.4484413