Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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The impact behaviors of electrified micro-droplet with existence and nonexistence of electrical charged for surface

표면 전하 유무에 따른 대전된 미소액적의 충돌 현상

  • Lee, Jaehyun (Department of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Jihoon (Korea Institute of Ocean Science and Technology (KIOST)) ;
  • Byun, Doyoung (Department of Mechanical Engineering, Sungkyunkwan University)
  • Received : 2015.04.01
  • Accepted : 2015.04.29
  • Published : 2015.04.30
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Abstract

Recently, researches for droplet impact phenomena have been faced a new phase in the direction of studying the effect of complex external conditions (e.g. wettability, temperature, morphology, electric field, etc.) for depth understanding and precise controlling in various applications. Hence, here we investigated the electrified droplet impact phenomena, because there were few quantitative researches for electrified droplet impact when we considering many real applications such as electrospray, electrohydrodynamic (EHD) jet printing. To observe interaction effect of surface charge between substrate and droplet simultaneously, micro-droplets with various Reynolds number (Re) and Weber number (We) were dripped on super-hydrophobic surface with existence and nonexistence of electrical surface charge. It shows three kinds of impact behaviors, fully bouncing, partial bouncing, and splashing with different We. Also, charged droplet bounced higher on electrically charged surface than on non-charged surface. Additionally, transition regions of three impact behaviors were classified quantitatively with water hammer pressure value, which means instant pressure inside droplet at the impact moment.

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