Title: Numerical study of capillary-driven flow in square micro-channel by lattice Boltzmann method
Authors: Mohamed El Amine Ben Amara; Patrick Perré; Abdolreza Kharaghani; Sassi Ben Nasrallah
Addresses: Laboratoire d'Études des Systèmes Thermiques et Énergétiques, École Nationale d'Ingénieurs, de Monastir, Monastir 5019, Tunisia ' LGPM, CentraleSupelec, Université Paris-Saclay, Grande Voie des Vignes, 92 290 Châtenay-Malabry, France ' Thermal Process Engineering, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39016 Magdeburg, Germany ' Deceased; formerly of Laboratoire d'Études des Systèmes Thermiques et Énergétiques, École Nationale d'Ingénieurs de Monastir, Monastir 5019, Tunisia
Abstract: This paper presents an investigation into capillary rise dynamics in a vertical square micro-channel based on the lattice Boltzmann method with the Shan-Chen multiphase model. Several different numerical test problems are carried out to validate the model and to provide parameter information, which is then used to simulate the wetting fluid rise in a square tube. The numerical simulation results depict fast flow and accumulation of liquid in the capillary corners. The dynamics of the liquid penetration into a square capillary is also illustrated, which reveals the occurrence of oscillations at the initial time before the liquid reaches a stable regime. Furthermore, the streamlines inside the square capillary as well as the density profiles are obtained by the numerical simulations. The results show the existence of recirculation zones in the cross section and in the inlet region of the micro-channel. The dynamic contact angle was clearly observed via the numerical simulations. Finally, the dynamics of capillary rise were also studied for the micro-channel in which a thin vertical plate was integrated.
Keywords: capillary rise; lattice Boltzmann method; Shan-Chen model; corner liquid films.
Progress in Computational Fluid Dynamics, An International Journal, 2019 Vol.19 No.1, pp.12 - 21
Accepted: 04 Jul 2017
Published online: 31 Jan 2019 *