한국가시화정보학회지 (Journal of the Korean Society of Visualization)

  • 제16권3호
  • /
  • Pages.47-51
  • /
  • 2018
  • /
  • 1598-8430(pISSN)
  • /
  • 2093-808X(eISSN)
한국가시화정보학회 (The Korean Society of Visualization)
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전기수력학적 분무 방식을 통해 토출된 비뉴튼성 및 점성유체의 충돌 거동에 대한 실험적 연구

Experimental investigation on impinging behaviors of non-Newtonian and viscous droplets through electrohydrodynamic atomization

  • Seo, Kyoung Duck (Department of Mechanical Engineering, Wonkwang University) ;
  • Hong, Jiwoo (Department of Mechanical Engineering, POSTECH)
  • 투고 : 2018.12.03
  • 심사 : 2018.12.28
  • 발행 : 2018.12.31
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초록

The stable deposition of impinging droplets on non-wetting substrates is of great importance for numerous industrial and scientific applications such as coating techniques, inkjet printing, spray cooling of heated surfaces. In this work, we systematically investigate impinging behaviors of non-Newtonian and viscous droplets ejected by electrohydrodynamic atomization.

키워드

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Fig. 1. Experimental setup of electrohydrodynamic atomization.

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Fig. 2. Temporal variation of base radii of PAM droplets after impinging on hydrophobic surface (a) DI water, (b) PAM 5 wt%, (c) PAM 10 wt%, (d) PAM 25 wt%, (e) PAM 40 wt%

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Fig. 3. Temporal variation of base radii of glycerol droplets after impinging on hydrophobic surface (a) DI water, (b) Glycerol 20 wt%, (c) Glycerol 50 wt%, (d) Glycerol 70 wt%

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Fig. 4. Comparison of impacting behaviors between droplets of PAM 5 wt% and Glycerol 20 wt%.

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Fig. 5. Impinging behaviors of Newtonian and non-Newtonian droplets (a) DI water, (b) PAM 5 wt%, (c) Glycerol 20 wt%

Table 1. Physical properties of working fluids.

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Table 2. Natural oscillation period of droplets (P2 mode)

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참고문헌

  1. Cloupeau, M. and Prunet-Foch, B., 1994, "Electrohydrodynamic spraying funciton modes: A critical review," J. Aerosol Sci. Vol. 25, pp.1021-1036. https://doi.org/10.1016/0021-8502(94)90199-6
  2. Plesset, M. S., 1954, "On the stability of fluid flows with spherical symmetry," J. Appl. Phys. Vol. 25, pp.96-98. https://doi.org/10.1063/1.1721529
  3. Plesset, M. S. and Prosperetti, A., 1977, "Bubble dynamics and cavitation," Ann. Rev. Fluid Mech. Vol. 9, pp.145-185. https://doi.org/10.1146/annurev.fl.09.010177.001045
  4. Son, Y., Kim, C., 2009, "Spreading of inkjet droplet of non-Newtonian fluid on solid surface with controlled contact angle at low Weber and Reynolds numbers," J. Non-Newtonian Fluid Mech. Vol. 162, pp.78-87. https://doi.org/10.1016/j.jnnfm.2009.05.009
  5. Bartolo, D., Boudaoud, A., Narcy, G., and Bonn, D., 2007, "Dynamics of non-Newtonian droplets," Phys. Rev. Lett. Vol. 99, 174502. https://doi.org/10.1103/PhysRevLett.99.174502