Abstract
In this paper, the displacement and deformation of a two-dimensional droplet on a vertical wall are examined using a modified pseudopotential model and imposing the multi-relaxation time into the collision term. The selected model guarantees the thermodynamic consistency adjusting proper values for the constant of the potential function k and the weighting factor for the force term, A. Also, it is possible to add adhesion forces and create different contact angles defining the index function for the solid points. Accordingly, non-dimensional parameters of Reynolds number, Weber number, Froude number, and density ratio are defined under the influence of the gravitational force and the uniform vapor flow. Results show that the change of the each dimensionless numbers affects the slip ratio between the droplet and vapor. It is also observed that in addition to the effects of viscous and gravitational forces, the change of the contact angle plays a significant role in the displacement and velocity of the droplet. The results show that reducing the contact angle increases the surface wettability and decreases the droplet velocity. It is seen that by decreasing the intermolecular forces at the Weber number of 62.36 and contact angle of 150°, the droplet begins to decay. Also, it is concluded that the droplet rubbing on the solid surface weakens the slip ratio in all cases.
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Taghilou, M., Zarei, S. LBM Investigation of the Droplet Displacement and Rubbing on a Vertical Wall by a Modified Pseudopotential Model. Iran J Sci Technol Trans Mech Eng 45, 755–768 (2021). https://doi.org/10.1007/s40997-021-00435-3
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DOI: https://doi.org/10.1007/s40997-021-00435-3