Filtration Based on Electrostatic Devices

, M.Sc. Thesis Sharif University of Technology Rahimi, Neda (Author) ; Saidi, Mohammad Said (Supervisor) ; Sani, Mahdi (Supervisor)

Abstract

Particulate air pollution is one of the top environmental health risks. Industrial processes like power generation from fossil fuels and steel and cement manufacturing release a huge amount of particles into the atmosphere. Moreover, internal combustion engines produce a considerable amount of particulate matter in populated areas. The usual way to overcome this risk is using air-cleaning devices such as filters. Filters are designed for specific purposes like removing aerosol particles, aerosol sampling and collecting valuable particles. Because of its diverse applications, filtration has become an active area of research and many kinds of filters are currently available. One type of...

Numerical Study on the Influence of Magnetic and Electric Fields on Filtration Performance of Wet Granular Beds

, M.Sc. Thesis Sharif University of Technology Sabbaghian, Sina (Author) ; Moosavi, Ali (Supervisor) ; Sadrhosseini, Hani (Supervisor)

Abstract

The aim of this study is to develop an understanding of the role of the magnetic and electric forces on the filtration performance of wet granular beds. At first, the effect of wetting is considered by locating micro water film around the square channel for particles deposition in four different Reynolds Re=1 to Re=10 number, Typically 1000 particles in different sizes (100nm-10μm) were injected to microchannel when air and water formed completely on the surface of the block. The Drag force, Brownian force, Saffman`s lift force and the gravity force are affecting the particles. After that Dielectrophoretic and Magnetophoretic forces were included in the domain for investigating the role of...

A Phase-Field Model for Inhomogeneous Multiferroic Materials

, M.Sc. Thesis Sharif University of Technology Jafari, Bahram (Author) ; Tavakoli, Rouhollah (Supervisor)

Abstract

In this thesis, by deliberately embedding “emplacements” in the system to locally break the inversion and the time reversal symmetries, the manifold of all possible microstructures is navigated in pursuit of the one that can give rise to maximal magnetoelectric effect mediated by elastic energy of piezoelectric-piezomagnetic phases via their interface --- needless to mention the low intensity of such an effect in single-phase multiferroics. The configuration with the maximal coupling is sought within the context of phase-field modeling. In order to numerically track the conserved dissipative dynamics of the interface (namely, the Cahn-Hilliard equation) --- that is nonlocal by the nature of...