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Application of the Maxwell-Stefan theory in modeling gas diffusion experiments into isolated oil droplets by water
, Article Physics of Fluids ; Volume 34, Issue 11 , 2022 ; 10706631 (ISSN) ; Rostami, B ; Ghazanfari, M. H ; Khosravi, M ; Sharif University of Technology
American Institute of Physics Inc
2022
Abstract
We have used the Maxwell-Stefan diffusion theory to model the mass transfer between tertiary-injected gas and residual oil blocked by water, in order to predict the time required for the rupture of the water barrier due to oil swelling. We have also designed and conducted a set of visualization micromodel experiments on various pure and multicomponent oil-gas systems to measure the water rupture time in tertiary gas injection processes. The experimental results show that the initial pressure and dimensions of the system, the oil and gas composition, and the gas solubility in water control the oil swelling process. The experimentally measured rupture times are then employed to evaluate the...
Investigating the Effect of Geometric Shape and Properties of Protein Corona on Drug Release Using Finite Element Method
, M.Sc. Thesis Sharif University of Technology ; Naghdabadi, Reza (Supervisor)
Abstract
In novel drug delivery systems, once nanocarriers confront the biological milieu, their surface is rapidly covered with a layer of biomolecules (i.e., “protein corona”) which play an important role in their drug release rate. Various experimental studies have been done to elucidate the effect of nanoparticles properties on the drug release rate in different biological applications. The physical and geometrical properties of protein corona totally influence on the release profile. In this study, we proposed a suitable finite element model which contains the nanoparticles and the protein layer with their properties in the biological milieu. To this end, diffusion parameters including diffusion...
Investigating the Role of Molecular Diffusion on Oil Recovery by Gas Injection Into Fractured Reservoirs and Scaling Up the Experimental Data
, Ph.D. Dissertation Sharif University of Technology ; Ghazanfari, Mohammad Hossein (Supervisor) ; Jamshidi, Saeed (Co-Supervisor)
Abstract
Fracture reservoir modeling is an important subject since a lot of oil and gas resources around the world are preserved in them. One of the enhanced oil recovery methods in these reservoirs is gas injection and especially CO2 injection because of environmental issues. In one part of this research, a new diffusion mechanism called “double cross-phase diffusion” is introduced and applied to simulate the non-equilibrium gas injection process into fractured rocks. This new mechanism represents additional multicomponent gas diffusion into the crude oil through the water phase, existing in porous media as initial water saturation. Therefore, a lab-scale simulator, by implementing the generalized...
On a generalized basis for solving the one dimensional transport equation: Theory
, Article Journal of Quantitative Spectroscopy and Radiative Transfer ; Volume 113, Issue 5 , 2012 , Pages 335-341 ; 00224073 (ISSN) ; Vosoughi, N ; Sharif University of Technology
Abstract
The most general basis for approximating the transport equation has been studied. The application of the Gram-Schmidt procedure has been shown to unify the complete class of functions (polynomial type or non-polynomial type), applicable to this equation. The completeness of the series of functions is proved. A generalized version of the Fick's law is introduced. It is shown that the spectrum of the transport equation obtained by this method agrees with the conventional methods of obtaining the spectrum
Experimental investigation of constant and concentration-dependent diffusivity of a hydrocarbon solvents-heavy oil system: A comparative study
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 34, Issue 3 , 2011 , Pages 235-245 ; 15567036 (ISSN) ; Kharrat, R ; Ghazanfari, M. H ; Rashtchian, D ; Sharif University of Technology
Abstract
This work is concerned with the experimental investigation of mass transfer, which occurs during diffusion of hydrocarbon solvents in heavy oil based on constant and concentration-dependent diffusion coefficient. Here, a series of free fall diffusion experiments have been conducted in sealed test tubes at fixed temperatures. Pentane, hexane, and octane were used as solvents and were placed on heavy oil in tubes. The diffusivity of heavy oil into solvents was monitored by a digital camera. The image analysis technique was applied to extract concentration profiles in diffusion zones of solvents by means of calibration curves. Fick's second law was used to obtain both constant and...