Abstract
This paper numerically analyzes the crown formation due to a plane two-dimensional drop impact onto a pre-existing film in a viscoelastic fluid. The finite volume method is applied to solve the governing equations, and the volume of fluid technique is utilized to track the liquid’s free surface. Here, the non-linear Giesekus model is used as the constitutive equation for the viscoelastic phase. The formation and temporal evolution of the crown’s parameters are evaluated using fluid elasticity and non-linear viscometric functions. The results show that a rise in the Weissenberg number, the viscosity ratio, the Weber number, and the mobility factor of the viscoelastic fluid leads to an increase in both the dimensionless height and radius of the crown, while increasing the Bond number leads to a decrease in the growth of the crown’s dimensions. Moreover, by increasing the film’s thickness, the crown’s height increases, while the crown’s radius decreases. One of the main findings of the present study is that the fluid’s elasticity and surface tension forces enhance the crown’s propagation.
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Abbreviations
- \(Bo\) :
-
The Bond number
- \(D\) :
-
The drop’s diameter
- \(\bf g\) :
-
Acceleration of gravity
- \(h\) :
-
The film’s thickness
- \(H\) :
-
The dimensionless thickness of the film
- \(p\) :
-
Pressure
- \(R\) :
-
The crown’s radius
- \(Re\) :
-
The Reynolds number
- \(t\) :
-
Time
- \(U_{0}\) :
-
The drop’s velocity
- \(\bf {\bf \text{v}}\) :
-
The velocity vector
- \(Z\) :
-
The crown’s height
- \(We\) :
-
The Weber number
- \(Wi\) :
-
The Weissenberg number
- \(\alpha\) :
-
The mobility factor
- \(\beta\) :
-
The viscosity ratio
- \(\phi\) :
-
The volume fraction
- \(\eta\) :
-
The viscosity
- \(\kappa\) :
-
The interface’s curvature
- \(\lambda\) :
-
The relaxation time
- \(\rho\) :
-
The density
- \(\sigma\) :
-
Surface tension
- \(\bf \uptau\) :
-
Stress tensor
- \(p\) :
-
Polymer
- \(s\) :
-
Solvent
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Appendices
Appendix 1
The MATLAB code for image processing of the results is as follows:
Appendix 2
Figure 20 illustrates that the volumes of the two phases are conserved.
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Rezaie, M.R., Norouzi, M., Kayhani, M.H. et al. Numerical analysis of the drop impact onto a liquid film of non-linear viscoelastic fluids. Meccanica 56, 2021–2038 (2021). https://doi.org/10.1007/s11012-021-01363-x
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DOI: https://doi.org/10.1007/s11012-021-01363-x