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Analysis of droplet motion - sliding on and detaching from a vertical surface.

Number: 2460

Author(s) : ZOU H., JIN H., WANG S.

Summary

Droplets sliding on and detaching from a surface exist in all different scenarios, and this motion is essential since retention and shedding of droplets affect energy consumption and system performance in many applications, for example air dehumidification and heat pump systems. While multiple factors affect the droplet motion, including droplet size, surface energy and micro-nano structure, air velocity etc., there is few good models to predict the motion of droplet, especially how the droplet overcomes the pin of the surface edge. In this work, experiment has been conducted to investigate droplet motions while it is sliding down different surfaces. Droplet velocity, dynamic contact angle (receding and advancing) has been measured through image processing. Force analysis is conducted for different stages of droplet motion down the vertical surface, and together with experiment data, impacts of various factors including droplet shape variation have been identified and qualitatively analyzed. Additionally, hydrophilic-hydrophobic wettability gradient is introduced to the scenario. It is found that length of the hydrophobic coating region has an impact on its improvement of water drainage. The results derived from this work provide a deeper understanding of droplet motion on surfaces under gravitational force and can serve as the guidance for heat exchanger design.

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Pages: 11 p.

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Details

  • Original title: Analysis of droplet motion - sliding on and detaching from a vertical surface.
  • Record ID : 30030739
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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