Theoretical and experimental studies on the contact line motion of second-order fluid

Jeongin Han, Chongyoup Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, we studied the contact line motion of second-order fluids theoretically and experimentally. The theoretical study showed that the positive first normal stress difference (N1) increases the contact line velocity while the second normal stress difference (N2) does not affect the contact line motion. The increased contact line velocity is caused by the hoop stress acting on the curved stream lines near the contact line. The hoop stress increases the liquid pressure near the contact line, and the increased pressure changes the surface profile to have the smaller curvature and smaller dynamic contact angle. The contribution of N1is 1 order of magnitude smaller than the contribution from the viscous component when the Deborah number remains O(1). For experiments, silicone oils of different kinematic viscosities (1,000-200,000 mm2/s) were used while eliminating the drying problem and shear-thinning effect near the contact line. The silicone oils were well fitted to the second-order fluid model with the positive first normal stress difference. The spreading rate of a silicone oil drop on a solid surface was faster than the spreading rate predicted by the theory for Newtonian fluids. As the theory predicts that N1increases the contact line velocity and the experimental result confirms the theoretical prediction, the effect of N1is established.

Original languageEnglish
Pages (from-to)55-66
Number of pages12
JournalRheologica Acta
Volume53
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Contacts (fluid mechanics)
Silicone Oils
silicones
Fluids
Silicones
fluids
hoops
oils
shear thinning
Shear thinning
Newtonian fluids
solid surfaces
drying
Contact angle
Drying
kinematics
curvature
Viscosity
viscosity
Liquids

Keywords

  • Drop spreading
  • First normal stress difference
  • Tanner-Pipkin theorem
  • Tanner-Voinov-Hoffman relation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Theoretical and experimental studies on the contact line motion of second-order fluid. / Han, Jeongin; Kim, Chongyoup.

In: Rheologica Acta, Vol. 53, No. 1, 01.01.2014, p. 55-66.

Research output: Contribution to journalArticle

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