Loading...

Computational Two-dimensional Study of Oscillating Electrical Field on Break-up of a Drop, Using Hybrid Lattice Boltzmann-Finite Volume Method

Mohseni Kafshgar Kolaei, Amir Hossein | 2021

364 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54339 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Taeibi Rahni, Mohammad; Salimi, Mohammad Reza
  7. Abstract:
  8. Drop formation is an interesting field of research due to its wide-range of applications, such as drug delivery, biomedical studies, pharmaceutical industry, Lab-On-Chip (LOC) devices, etc. In recent years, researchers have used numerical studies to better understand how the process of forming and carefully examining the factors that affect quality improvement. One of the most effective methods in controlling the size and the process of drop formation is use of external force in microfluidic devices. Among the external force in this study, an electric field with oscillating current was used. Rapid methods for creating, deforming, and breaking up of drops in microfluidic applications are important research topics and drop formation using an electric field is one of the newest approaches. The main purpose of the present study is to investigate the effects of frequency and amplitude changes of electric field on the dynamics of a drop and the relation between frequency changes of the electrical field with drop failure rate (finding the optimal frequency). In this study, the dynamic of a drop suspended in a liquid (without mixing) is examined in two dimensions. The drop is affected by an oscillating electric field and both fluids are leaky dielectric with different powers. The analysis of electric field fluctuations on the dynamics of a drop has not been performed before and therefore is the main innovation of the present study. The two-phase fluids were analyzed using Lattice Boltzmann method (LBM) using a suitable two-phase model and the electric field is analyzed, using a finite volume method. During two-phase flow modeling, using LBM, the electric field is calculated using finite volume method and a known function of electric potential. Then, the volumetric force applied by the electric field is applied to the contact surface of the two phases and enters into the calculations of the lattice Boltzmann method
  9. Keywords:
  10. Numerical Study ; Multiphase Flow ; Drop Breakage ; Oscillating Electrical Field ; Hybrid Lattice Boltzmann-Finite Volume Method

 Digital Object List

 Bookmark

No TOC