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Dynamic behavior of a droplet on a moving wall

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Abstract

A two-dimensional immiscible droplet deformation phenomenon on a moving channel bottom wall is simulated using the lattice Boltzmann method. We considered the effect of the initial static contact angle, the capillary number, and the size of the droplet on the dynamic behavior of the moving droplet. When the initial static contact angle is less than 90°, the moving droplet is deformed and stretched, resulting in increasing width and decreasing height of the droplet. This is due to the hydrophilic (wetting) characteristic of the channel’s bottom wall. However, when the initial static contact angle is larger than 90°, the deformed and stretched droplet on the moving channel bottom wall is broken up, and is then pinched off or detached from the moving channel bottom wall, depending on the initial static contact angle and capillary number. This is due to the hydrophobic (non-wetting) characteristic of the wall.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, San 30, Jang Jeon Dong, Geum Jeong Gu, Busan, 609-735, Korea

    Hyung Rak Kim, ManYeong Ha & Sung Wan Son

  2. Advanced Ship Engineering Research Center, Pusan National University, San 30, Jang Jeon Dong, Geum Jeong Gu, Busan, 609-735, Korea

    Hyun Sik Yoon

Authors
  1. Hyung Rak Kim
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  2. ManYeong Ha
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  3. Hyun Sik Yoon
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  4. Sung Wan Son
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Corresponding author

Correspondence to ManYeong Ha.

Additional information

Recommended by Associate Editor Gihun Son

M. Y. Ha received his B.S. degree from Pusan National University, Korea in 1981, his M.S. degree, in 1983, from Korea Advanced Institute of Science and Technology, Korea, and his Ph.D. from Pennsylvania State University, USA in 1990. Dr. Ha is currently a Professor at the School of Mechanical Engineering at Pusan National University in Buasn, Korea. He serves as an Editor of the Journal of Mechanical Science and Technology. His research interests are focused on thermal management, computational fluid dynamics, and micro/nano fluids.

H. R. Kim received his M.S. degree in 2011 from Pusan National University, Korea. In his master course, he conducted a number of studies under the supervision of Prof. Man-Yeong Ha. His research interests are focused on thermofluid phenomena analysis for enhancing the efficiency of industrial devices.

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Kim, H.R., Ha, M., Yoon, H.S. et al. Dynamic behavior of a droplet on a moving wall. J Mech Sci Technol 28, 1709–1720 (2014). https://doi.org/10.1007/s12206-014-0316-y

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  • DOI: https://doi.org/10.1007/s12206-014-0316-y

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