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Synthesis of Composite Membranes Based on Polyaniline for Gas Separation
, M.Sc. Thesis Sharif University of Technology ; Forounchi, Masoud (Supervisor)
Abstract
Polymeric membranes based on polyaniline and PVDF were prepared by using cast-solvent film method. The effects of various parameters including polyaniline synthesis temparature, thickness of the PANI/PVDF films and feed pressure were investigated. The results obtained from exprimental data showed increasing permeability with reducing the thickness of the film and increasing feed pressure. Increasing polyaniline synthesis temprature increased the permeability of PANI/PVDF films. Reducing the films thikcness and increasing the feed pressure decreased the selectivity of films for the , and . The results showed increasing selectivity for PANI/PVDF films by using PANI produced at 10°C....
Evaluation of Permeable Pavement in Removing Pollutants from Surface Runoff
, M.Sc. Thesis Sharif University of Technology ; Tajrishi, Masoud (Supervisor) ; Nazari Alavi, Alireza (Supervisor)
Abstract
Urbanization expansion increases impermeable surfaces and ultimately produces more runoff from urban surfaces. The runoff in the urban streets moves the pollution with high levels from the city and then collects into channels where they are transported into the water courses. The most important factor in runoff polluting is sediments. If you remove sediments from runoff, their quality will be improved. One of the effective systems to reduce sediments from the surface runoff is permeable pavement. In this study a simulator system is used. The sample of permeable pavement analysed consisted of two layers of geotextile beddig, filter granular layer (2.36 to 4.75mm), subbase granular layer (4.75...
Monitoring the influence of dispersed nano-particles on oil-water relative permeability hysteresis
, Article Journal of Petroleum Science and Engineering ; Vol. 124, issue , December , 2014 , p. 222-231 ; ISSN: 09204105 ; Masihi, M ; Ghazanfari, M. H ; Sharif University of Technology
Abstract
In recent years, polysilicon nanoparticles are used to enhance the oil recovery through the water injection process in oilfields. The contributing mechanisms are the reduction of interfacial tension and wettability alteration which lead to improving or decreasing the oil phase relative permeability and can be traced by change of relative permeability curves. However, profound understanding of the effect of dispersed nano-silica particles on the hysteretic behavior of relative permeability curves remains a controversy topic in the literature.The current study illustrates the influence of dispersed silica particles on hysteretic trend of two-phase curves of oil-water relative permeability....
Separation of CO2/CH4 through alumina-supported geminal ionic liquid membranes
, Article Journal of Membrane Science ; Vol. 455 , 2014 , pp. 229-235 ; ISSN: 03767388 ; Adibi, M ; Seifkordi, A. A ; Fazli, Y ; Sharif University of Technology
Abstract
Interesting properties of ionic liquids lead to their application as sub-component of membrane structures. Supported ionic liquid membranes (SILMs) are porous membranes whose pores are saturated with ionic liquids. Two ionic liquids, pr[mim]2[Tf2N]2 [1,3-di(3-methyl-imidazolium) propane bis(trifluoromethylsulfonyl) imide] and, h[mim]2 [Tf2N]2 [(1,6-di(3-methylimidazolium)hexane bis(trifluoromethylsulfonyl)imide)], were synthesized in our laboratory and stabilized on an alumina porous support. Permeability and permselectivity of carbon dioxide and methane using membranes containing these ionic liquids were then measured. The experiments were performed in the pressure range of 10-50kPa and...
Retina-Choroid-Sclera Permeability for Ophthalmic Drugs in the Vitreous to Blood Direction: Quantitative Assessment
, Article Pharmaceutical Research ; 2012 , Pages 1-19 ; 07248741 (ISSN) ; Abdekhodaie, M. J ; Cheng, Y. L ; Sharif University of Technology
Springer
2012
Abstract
Purpose: To determine the outward permeability of retina-choroid-sclera (RCS) layer for different ophthalmic drugs and to develop correlations between drug physicochemical properties and RCS permeability. Methods: A finite volume model was developed to simulate pharmacokinetics in the eye following drug administration by intravitreal injection. The RCS permeability was determined for 32 compounds by best fitting the drug concentration-time profile obtained by simulation with previously reported experimental data. Multiple linear regression was then used to develop correlations between best fit RCS permeability and drugs physicochemical properties. Results: The RCS drug permeabilities had...
Experimental study and calculation of CO 2-oil relative permeability
, Article Petroleum and Coal ; Volume 53, Issue 2 , 2011 , Pages 123-131 ; 13377027 (ISSN) ; Bolouri, S. H ; Sharif University of Technology
2011
Abstract
Carbon dioxide-oil relative permeability is measured under reservoir condition using core flood apparatus. Then the results are compared with Nitrogen-oil relative permeability. The results show that oil permeability is higher in Carbon dioxide injection compared to nitrogen injection. The comparison of gas permeabilities shows that at the start of injection, nitrogen and carbon dioxide relative permeability are equal, but as the gas saturation increased, Nitrogen relative permeability becomes higher. Finally, a method is proposed to calculate carbon dioxide-oil relative permeability from nitrogen-oil relative permeability. This method can be generalized to calculate relative permeability...
Pore scale study of permeability and tortuosity for flow through particulate media using Lattice Boltzmann method
, Article International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 35, Issue 8 , 2011 , Pages 886-901 ; 03639061 (ISSN) ; Pak, A ; Sharif University of Technology
2011
Abstract
In this paper, Lattice Boltzmann method (LBM) has been used to study the effects of permeability and tortuosity on flow through saturated particulate media and identify the relationships between permeability and tortuosity with other parameters such as particles diameter, grain specific surface, and porosity. LBM is a simple kinematic model that can incorporate the essential physics of microscopic and mesoscopic processes involved in flow through granular soils. The obtained results indicate that the 2D LB model, due to its inherent theoretical advantages, is capable of demonstrating that the porosity and specific surface are the most influential parameters in determining the intrinsic...
Relative permeability and capillary pressure curves for low salinity water flooding in sandstone rocks
, Article Journal of Natural Gas Science and Engineering ; Volume 25 , July , 2015 , Pages 30-38 ; 18755100 (ISSN) ; Ghazanfari, M. H ; Masihi, M ; Sharif University of Technology
Elsevier
2015
Abstract
Recently much attention has been paid to the use of low salinity water (LSW) as an enhanced oil recovery fluid. The change observed in recovery factor during LSW flooding is induced from changes in relative permeability and capillary pressure when different levels of salinity are used. However, a few researchers tried to evaluate how macroscopic flow functions depend on the salinity of the injected water. To this end, a series of oil displacement by water was performed on a sandstone rock aged with crude oil in the presence of connate water. The capillary pressure and relative permeability curves are evaluated from inverse modeling of the obtained pressure drop and oil production data. Then,...
A study on the key influential factors of a gas reservoir's potential for aqueous phase trapping
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 34, Issue 16 , 2012 , Pages 1541-1549 ; 15567036 (ISSN) ; Dalvand, K ; Oraki Kohshour, I ; Masihi, M ; Moghadasi, J ; Sharif University of Technology
Abstract
Aqueous phase trapping in many oil and gas reservoirs is a noteworthy mechanism of formation damage during drilling, completion, work over, and stimulation operation. Aqueous phase trapping can limit the productivity of a well to a high extent, especially in low permeable gas reservoirs. In this article, using aqueous phase trapping laboratory tests on low permeable sandstone cores' effect of key factors on gas reservoir's potential for aqueous phase trapping was investigated. Studied factors were initial water saturation, permeability, water filtrate viscosity, and drawdown pressure. Results showed that severity of formation damage caused by aqueous phase trapping increases as each of the...
Vacuum enhanced membrane distillation for trace contaminant removal of heavy metals from water by electrospun PVDF/TiO2 hybrid membranes
, Article Korean Journal of Chemical Engineering ; Volume 33, Issue 7 , 2016 , Pages 2160-2168 ; 02561115 (ISSN) ; Monfared, S. M ; Amini, Y ; Dastbaz, A ; Sharif University of Technology
Springer New York LLC
Abstract
Electrospun hybrid membranes were synthesized using electrospinning of Poly (vinylidenefluoride) - titanium tetraisopropoxide (PVDF-TTIP) sol. Asymmetric post-treatment of membrane conducted for deprotonation of titanate and making hydrophilic/hydrophobic dual characteristics. The membranes were characterized by various methods such as wettability, scanning electron microscopy, infrared spectroscopy, X-ray diffraction and liquid entry pressure tests. For evaluating the separation performance, these membranes were applied in the VMD process to treat water heavy metal contaminants. The effects of operating parameters such as flow rate, temperature and membrane properties as porosity, on...
Modeling the permeability of heterogeneous oil reservoirs using a robust method
, Article Geosciences Journal ; Volume 20, Issue 2 , 2016 , Pages 259-271 ; 12264806 (ISSN) ; Moeini, F ; Shamsoddini Moghadam, M. J ; Hosseini, S. A ; Mohammadi, A. H ; Hemmati Sarapardeh, A ; Sharif University of Technology
Korean Association of Geoscience Societies
2016
Abstract
Permeability as a fundamental reservoir property plays a key role in reserve estimation, numerical reservoir simulation, reservoir engineering calculations, drilling planning, and mapping reservoir quality. In heterogeneous reservoir, due to complexity, natural heterogeneity, non-uniformity, and non-linearity in parameters, prediction of permeability is not straightforward. To ease this problem, a novel mathematical robust model has been proposed to predict the permeability in heterogeneous carbonate reservoirs. To this end, a fairly new soft computing method, namely least square support vector machine (LSSVM) modeling optimized with coupled simulated annealing (CSA) optimization technique...
On the importance of gel rigidity and coverage in a smart water shutoff treatment in gas wells
, Article Journal of Natural Gas Science and Engineering ; Volume 31 , 2016 , Pages 808-818 ; 18755100 (ISSN) ; Escrochi, M ; Riazi, M ; Ayatollahi, S ; Sharif University of Technology
Abstract
This paper addresses a conceptual study on different aspects of a novel smart treatment method for a relatively new challenge of saline water production from low permeability lenses of high flow gas wells. Selective sealing of such lenses along with minor effect on gas productivity usually faces practical difficulties due to the inherent permeability contrast. Engineered application of salt sensitive gellan biopolymer through a smart treatment scenario that includes a protective gas flow proved its ability for treating such challenge. This paper investigates the importance of the gel rigidity and its coverage in the smart treatment scenario through considering the brine salinity and the...
Gas-oil relative permeability at near miscible conditions: an experimental and modeling approach
, Article Scientia Iranica ; Volume 20, Issue 3 , 2013 , Pages 626-636 ; 10263098 (ISSN) ; Masihi, M ; Ghazanfari, M. H ; Sharif University of Technology
Abstract
Reliable relative permeability curves of oil-gas systems are important for successful simulation and modeling of gas injection, especially when the miscibility condition approaches. In this work, the relative permeability of a CO2-light oil system has been measured under different conditions, using the Civan and Donaldson (1989) [13] method. Dolomite and sandstone core samples were used in the experiments. The minimum miscibility pressure was calculated using an empirical correlation, as well as slim-tube simulation. Due to some controversial assumptions of the Civan and Donaldson method, such as immiscible and incompressible displacement, history matching was used for predicting the...
Joint estimation of facies boundaries and petrophysical properties in multi-facies channelized reservoirs through ensemble-based Kalman filter and level set parametrization
, Article Journal of Petroleum Science and Engineering ; Volume 167 , 2018 , Pages 752-773 ; 09204105 (ISSN) ; Pishvaie, M. R ; Boozarjomehry, R. B ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Ensemble-based assimilation methods are the most promising tools for dynamic characterization of reservoir models. However, because of inherent assumption of Gaussianity, these methods are not directly applicable to channelized reservoirs wherein the distribution of petrophysical properties is multimodal. Transformation of facies field to level set functions have been proposed to alleviate the problem of multimodality. Level set representation ensures that the estimated fields are facies realizations as well as no modification of the assimilation method is required. Moreover, due to the complexity of the history matching problem in the channelized reservoirs, most researchers conventionally...
Transport Property Estimation of Non-Uniform Porous Media
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 28, Issue 2 , 2009 , Pages 29-42 ; 10219986 (ISSN) ; Rashtchian, D ; Kharrat, R ; Vossoughi, S ; Sharif University of Technology
2009
Abstract
In this work a glass micromodel which its grains and pores are non-uniform in size shape and distribution is considered as porous medium. A two-dimensional random network modė, of micromodel with non-uniform pores has been constructed. The non-uniformity of porous model is achieved by assigning parametric distribution functions to pores throat and pores length, which was measured using image analysis technique. Statically derived expressions have been used for prediction of macroscopic properties of porous model including: dispersion coefficients, permeability-porosity ratio and capillary pressure. The results confirmed that predicted transport properties are in good agreement with the...
Effect of kerosene contamination on the physical and mechanical properties of sandy soil
, Article Innovative Infrastructure Solutions ; Volume 4, Issue 1 , 2019 ; 23644176 (ISSN) ; Zohrevand, P ; Rezaee, M ; Sharif University of Technology
Springer
2019
Abstract
Oil contamination can affect the mechanical and physical properties of soil, making its reuse a challenge. In the present study, the effect of kerosene contamination on two types of poorly graded sand (S1 and S2) was investigated. Geotechnical tests for compaction, direct shear and constant head permeability were conducted. The compaction test revealed that dry density increased at a 3% and 6% kerosene content for S1 and S2 soil, respectively. A further increase in kerosene content caused the dry density to decrease for both S1 and S2. The optimum moisture content of kerosene-contaminated soil samples decreased. The direct shear test showed that kerosene contamination increased cohesion and...
The impact of pavement permeability on time of concentration in a small urban watershed with a semi-arid climate
, Article Water Resources Management ; Volume 34, Issue 9 , 2020 , Pages 2969-2988 ; Tajrishy, M ; Jalilvand, E ; Sharif University of Technology
Springer
2020
Abstract
Despite the popularity of the permeable pavements in urban areas in recent years, a few empirical equations have been developed to estimate the time of concentration (Tc) on pervious surfaces, and almost none of them is evaluated over the permeable pavements. In this paper, we aim to investigate the effect of low impact development (LID) on Tc and develop a new equation for estimating overland flow Tc compatible with both permeable and impermeable pavements in small urban watersheds with a semi-arid climate. An experimental model was devised to determine the new equation. Synthetic rainfall (22–40 mm.h−1) was applied to a rectangular shaped (6 m × 1 m) test watershed with an adjustable...
An innovative workflow for selecting appraisal area in low permeability greenfield development under uncertainties
, Article Journal of Petroleum Science and Engineering ; Volume 206 , 2021 ; 09204105 (ISSN) ; Rafizadeh, M ; Pishvaie, M. R ; Ahmadi, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
There are uncertainties in both inherent geological properties and IOR/EOR performance parameters of low permeability greenfield reservoirs. Therefore, efforts to reduce uncertainties in the appraisal phase are necessary for the development and production phases. An adequate selection of the appraisal area in the hydrocarbon field is an imperative factor since the results of the appraisal well drilling and IOR/EOR pilot tests will be utilized for the development of the entire field. The major challenge in selecting an appraisal area is the lack of an integrated and systematic approach. In this study, we present a novel systematic and quantitative approach consisting of a better...
Corrigendum: “optimum rice husk ash content and bacterial concentration in self-compacting concrete” (construction and building materials (2019) 222 (796–813), (S0950061819316198), (10.1016/j.conbuildmat.2019.06.190))
, Article Construction and Building Materials ; Volume 283 , 2021 ; 09500618 (ISSN) ; Shoaei, P ; Bahrami, N ; Vaezi, M. S ; Ozbakkaloglu, T ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
The authors regret that there were minor errors in the labels of the XRD patterns of cement and micro-silica presented in Figs. 1 and 2, which have been corrected in the figures included here. In addition, due to concerns over the reliability of the XRD pattern of pumice shown in Fig. 9, as caused by a low signal count, the authors have re-analyzed the pumice and the updated XRD pattern has been included here. It is worth noting that these changes do not affect any of the conclusions. The authors would like to apologise for any inconvenience caused. © 2021
Similarity solution of free convection in a stratified porous medium with variable permeability
, Article 2005 ASME Summer Heat Transfer Conference, HT 2005, San Francisco, CA, 17 July 2005 through 22 July 2005 ; Volume 4 , 2005 , Pages 485-491 ; 0791847314 (ISBN); 9780791847312 (ISBN) ; Khodabakhsh, M ; Saidi, M. H ; Sharif University of Technology
2005
Abstract
In this paper, similarity solution of free convection from inclined permeable wall embedded in a stratified porous medium is investigated. It is assumed that the heated wall has constant temperature and permeability along the wall is variable. Energy equation and Darcy's law as momentum have been used. Due to similarity solution we consider only large wall inclination angle. Effects of mass flux, permeability variation function, and wall inclination angle on thermal and velocity boundary layer thickness and heat transfer at the wall are investigated. Copyright © 2005 by ASME