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Total 190 records

    Condensate blockage study in gas condensate reservoir

    , Article Journal of Natural Gas Science and Engineering ; Volume 33 , 2016 , Pages 634-643 ; 18755100 (ISSN) Rahimzadeh, A ; Bazargan, M ; Darvishi, R ; Mohammadi, A. H ; Sharif University of Technology
    Elsevier  2016
    Abstract
    The effect of condensate blockage on the pressure drop near the well bore has been studied. Two types of single well simulations have been conducted and pressure drop due to condensate blockage has been quantified based on variation of gas relative permeabilities in near well bore area. The relationship of condensate banking pressure drop, gas rate and reservoir quality has been presented. It is shown that for a poor reservoir quality, condensate blockage can increase the pressure drop up to 200% of the pressure drop in the tubing  

    Nano-coated condensation surfaces enhanced the productivity of the single-slope solar still by changing the condensation mechanism

    , Article Journal of Cleaner Production ; Volume 265 , 2020 Zanganeh, P ; Soltani Goharrizi, A ; Ayatollahi, S ; Feilizadeh, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Solar stills are considered an environmentally friendly technique to produce fresh water. The condensation surface plays an essential role in controlling the efficiency of the solar still. This main parameter is critically affected by the wettability of the condensation surface that affects the condensation mechanism, namely drop-wise or film-wise condensation. This study aims to enhance the efficiency of solar stills by altering the surface wettability hence changing the condensation mechanism using nanomaterials. In this experimental work, different condensation surfaces were coated by silicone nanoparticles to change the condensation mechanism from film to dropwise. Scanning electron... 

    Environmental evaluation and assessment of some important factors of oil contamination in soil around sarkhoun gas refinery of ar abbas

    , Article Journal of Environmental Studies ; Volume 37, Issue 57 , 2011 , Pages 9-18 ; 10258620 (ISSN) Ebrahimi, S ; Shayegan, J ; Malakouti, M. J ; Akbari, A ; Sharif University of Technology
    Abstract
    Hydrocarbon contaminations due to their volatility, solubility and biodegradability properties can enter the vadose zone and adversely influence the soil properties. Recently, some deep and superficial signs of oil pollution have emerged in the soils around the refinery of Sarkhoun. In order to assess the exact type and behavior of pollutants, evaluate the environmental attributes and measure some important factors of oil contamination in this region, and also to see how pollution transfer in the underground environment, this study has been done. Materials & methods Sarkhoun refinery is located 50 kilometers away from ar Abbas in the northeast direction. The area is mostly composed of Marne... 

    Production of silver nanometric powders via Inert Gas Condensation (IGC) method

    , Article Amirkabir (Journal of Science and Technology) ; Volume 16, Issue 61 C , 2005 , Pages 103-107 ; 10150951 (ISSN) Ahmadi, R ; Simchi, A ; Seyedreyhani, S ; Sharif University of Technology
    2005
    Abstract
    Nanopowders are powders with particle size less than 100 nanometer. The applications of nanopowders are in the production and processing of nanocomposites, microelectronic, industrial cathalists, coating, sintering at low temperature, lubricants, propellants, purification of aqiuos solutions, biomaterials and filtration. In this work, a reactor for production of nanopowder using IGC method was designed and manufactured. By changing the production parameters such as chamber temperature and pressure, evaporation rate, precursor and evaporation time, silver powders were produced. The characteristics of the produced powders were studied using EDX, SEM and TEM techniques. The results showed that... 

    Experimental investigation of a novel passive solar still with additional condensation on sidewalls

    , Article Desalination and Water Treatment ; Volume 89 , 2017 , Pages 29-35 ; 19443994 (ISSN) Shafii, M. B ; Favakeh, A ; Faegh, M ; Sadrhosseini, H ; Sharif University of Technology
    Abstract
    In common solar stills, a portion of the produced vapor undesirably condenses on the sidewalls and runs down to be mixed with saline water in the basin. This results in lower distillate output of the system. The aim of this study was to improve the condensation process of a solar still without complicating its structure to collect the water condensed on sidewalls. The proposed solar still was made of two containers nested one inside the other such that the smaller container, containing saline water, fitted easily into the larger container. There was a thin gap between the two in which condensed liquid on sidewalls, ran down and was collected from the bottom of the larger container. The... 

    Productivity enhancement of solar stills by nano-coating of condensing surface

    , Article Desalination ; Volume 454 , 2019 , Pages 1-9 ; 00119164 (ISSN) Zanganeh, P ; Soltani Goharrizi, A ; Ayatollahi, S ; Feilizadeh, M ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Wettability is one of the most important factors which significantly influences solar still efficiency. Moreover, it determines the condensation mode, i.e., filmwise or dropwise condensation. In the present study, materials with different wettability were applied as the condensing surface to evaluate the effect of wettability on the distillate production of a single slope solar still. To compare the effects of dropwise and filmwise condensation on the condensate yield, the wettability of the condensing surface was changed by applying a nano-silicon solution according to a dip coating technique. All the experiments were conducted at three surface inclination angles. The results revealed that... 

    An experimental phase diagram of a gas condensate reservoir

    , Article Petroleum Science and Technology ; Volume 30, Issue 20 , 2012 , Pages 2114-2121 ; 10916466 (ISSN) Kamari, E ; Shadizadeh, S. R ; Sharif University of Technology
    2012
    Abstract
    Most condensate gas reservoirs discovered in Iran are rich in intermediate components. The phase diagram of these fluids is essential for reservoir management. The available commercial reservoir fluid simulators are not able to find the critical point of some of these condensate gas reservoirs to obtain the phase diagram quality lines. The quality lines of these reservoir's samples can be obtained experimentally using the constant mass expansion test data. The authors present experimental development of gas condensate phase diagram along with retrograde condensation and revaporization characterization during the reservoir depletion process of one Iranian condensate gas reservoir  

    Growth of ZNO nanostructures on porous silicon and oxidized porous silicon substrates

    , Article Brazilian Journal of Physics ; Volume 41, Issue 2-3 , 2011 , Pages 113-117 ; 01039733 (ISSN) Rajabi, M ; Dariani, R. S ; Iraji Zad, A ; Sharif University of Technology
    Abstract
    We have investigated an oxidation of substrate effect on structural morphology of zinc oxide (ZnO) rods. ZnO rods are grown on porous silicon (PS) and on thermally oxidized porous silicon substrates by carbothermal reduction of ZnO powder through chemical vapour transport and condensation. Porous silicon is fabricated by electrochemical etching of silicon in hydrofluoric acid solution. The effects of substrates on morphology and structure of ZnO nanostructures have been studied. The morphology of substrates is studied by atomic force microscopy in contact mode. The texture coefficient of each sample is calculated from X-ray diffraction data that demonstrate random orientation of ZnO rods on... 

    Wettability alteration of reservoir rocks to gas wetting condition: a comparative study

    , Article Canadian Journal of Chemical Engineering ; Volume 96, Issue 4 , April , 2018 , Pages 997-1004 ; 00084034 (ISSN) Erfani Gahrooei, H. R ; Ghazanfari, M. H ; Karimi Malekabadi, F ; Sharif University of Technology
    Wiley-Liss Inc  2018
    Abstract
    Productivity of gas condensate reservoirs reduces significantly due to the near wellbore condensate/water blockage phenomenon. A novel, permanent solution to alleviate this problem is near wellbore wettability alteration of reservoir rocks to preferentially gas wetting conditions; industrial chemical materials are good candidates for this purpose, because of their eco-friendly characteristics, economical price, and mass production. In this paper, a comparative study is conducted on two industrial fluorinated chemicals, MariSeal 800 and SurfaPore M. Static and dynamic contact angle measurements, spontaneous imbibition, and core flooding tests were conducted to investigate the effect of... 

    The efficient synthesis of carbon–carbon double bonds via Knoevenagel condensation using red mud packed in a column

    , Article Green Chemistry Letters and Reviews ; Volume 1, Issue 1 , 2007 , Pages 61-64 ; 17518253 (ISSN) Khezri, S. H ; Mohammad Vali, M ; Eftekhari Sis, B ; Mahmoodi Hashemi, M ; Baniasadi, M. H ; Sharif University of Technology
    2007
    Abstract
    Red mud (RM) is generated as a by-product during the production of alumina from bauxite ore. In this study, RM packing in a column is used as a catalyst for carbon–carbon double bond formation via Knoevenagel condensation. The reactants are added to the top of the column and then eluted with solvent. The products are collected in high yields and short time. RM packed in a column eliminates a catalyst separation step from the reaction mixture in this work. © 2007 Taylor & Francis Group, LLC  

    A simple and efficient synthesis of new indeno- and naphtho-fused thiophenes using arylthioacetamides

    , Article Journal of Sulfur Chemistry ; Volume 27, Issue 6 , 2006 , Pages 545-552 ; 17415993 (ISSN) Moghaddam, F. M ; Saeidian, H ; Mirjafary, Z ; Taheri, S ; Sharif University of Technology
    2006
    Abstract
    New indeno- and naphtho-fused thiophenes were synthesized from reaction of 2-bromo-1-indanone and 2-bromo-1-tetralone with arylthioacetamides in good yields  

    Lithium perchlorate mediated three-component preparation of α-aminonitriles under solvent-free conditions

    , Article Synthetic Communications ; Volume 34, Issue 7 , 2004 , Pages 1207-1214 ; 00397911 (ISSN) Azizi, N ; Saidi, M. R ; Sharif University of Technology
    2004
    Abstract
    A three-component reaction between aliphatic or aromatic aldehyde, an amine and trimethylsilyl cyanide mediated by solid LiClO4, gave amino nitriles in good to excellent yields. The reaction proceeded smoothly under solvent-free conditions without any side products  

    New unsymmetrical oxovanadium(IV) complexes of mixed-donor amido and oxo ligands

    , Article Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry ; Volume 34, Issue 3 , 2004 , Pages 611-626 ; 00945714 (ISSN) Mohebi, S ; Boghaei, D. M ; Sharif University of Technology
    2004
    Abstract
    The novel, unsymmetrical, mixed-donor, tetradentate amido, and oxo complexes of V(IV) of the general formula VOLx were synthesized by a nontemplate method and characterized by physico-chemical methods. The ligands were prepared by a two-stage aldol condensation reaction in the molar ratio 1:1 of 2-hydroxybenzaldehyde, 2′-hydroxyacetophenone, or 2′,4′- dihydroxyacetophenone and 1,2-diaminopropane of the general formula HA x (x = 1-3) as precursors. The tetradentate mixed donor ligands of the general formula H2Lx (x = 1-6) were obtained by condensation reaction of precursors with appropriate ketone or aldehyde. The synthesis of the ligand system, described here, is an efficient and easy method... 

    A diffusion-controlled kinetic model for growth of Au-catalyzed ZnO nanorods: Theory and experiment

    , Article Journal of Crystal Growth ; Volume 309, Issue 1 , 2007 , Pages 70-75 ; 00220248 (ISSN) Hejazi, S. R ; Madaah Hosseini, H. R ; Sharif University of Technology
    2007
    Abstract
    A kinetic model for growth of ZnO nanorods via vapor-liquid-solid (VLS) mechanism based on the bulk diffusion of Zn atoms through the Au-Zn droplet is presented. The dependences of the growth rate on size are given quantitatively. A general expression for the growth rate of nanorods during VLS process is derived. The derived formula shows the dependences of growth rate on lateral size of nanorods, concentration and supersaturation of Zn atoms in the liquid droplet. Based on the presented kinetic model the smaller nanorods have faster growth rate. Au-catalyzed ZnO nanorods are grown by chemical vapor transport and condensation (CVTC) process experimentally. Theoretical and experimental... 

    Monitoring & Optimizing of the Returned Condensated Water as Boiler Make up Water at the Agro-Industry Hakim Farabi Boilers

    , M.Sc. Thesis Sharif University of Technology Askary Bozayeh, Hossein (Author) ; Alamolhoda, Ali Asghar (Supervisor) ; Pourjavadi, Ali (Co-Advisor)
    Abstract
    Vapor in agro-industry hakim farabi production electricity, Turbines force and thermal energy for Yellow and white sugar in sugar production. In the utilization to supply water for the boiler , condensate water return use Until plant be able to do its work ¬good quality of condensate water decrease cost of destruction energy in blow down and can save energy, reduce cost of chemical operation for optimum boiler water and costs associated with wastewater treatment. unclean condensate water consist of sugar and Electrical conductivity more than permissive is not suitable for use in The boiler because Increase the total dissolved solids and decreasing pH lower than the Extent permitted. The... 

    Evolving an accurate model based on machine learning approach for prediction of dew-point pressure in gas condensate reservoirs

    , Article Chemical Engineering Research and Design ; Vol. 92, issue. 5 , May , 2014 , p. 891-902 ; ISSN: 02638762 Majidi, S. M. J ; Shokrollahi, A ; Arabloo, M ; Mahdikhani-Soleymanloo, R ; Masihi, M ; Sharif University of Technology
    Abstract
    Over the years, accurate prediction of dew-point pressure of gas condensate has been a vital importance in reservoir evaluation. Although various scientists and researchers have proposed correlations for this purpose since 1942, but most of these models fail to provide the desired accuracy in prediction of dew-point pressure. Therefore, further improvement is still needed. The objective of this study is to present an improved artificial neural network (ANN) method to predict dew-point pressures in gas condensate reservoirs. The model was developed and tested using a total set of 562 experimental data point from different gas condensate fluids covering a wide range of variables. After a... 

    Development of a new workflow for pseudo-component generation of reservoir fluid detailed analysis: A gas condensate case study

    , Article International Journal of Oil, Gas and Coal Technology ; Vol. 7, Issue. 3 , 2014 , pp. 275-297 ; ISSN: 1753-3317 Assareh, M ; Pishvaie, M. R ; Ghotbi, C ; Mittermeir, G. M ; Sharif University of Technology
    Abstract
    In this work, a new automatic workflow for accurate optimal pseudo-component generation from gas condensate mixtures with a large number of components is presented. This workflow has a good insight into thermo-physical and critical properties and introduces only a small amount of loss of information and EOS flexibility. In this regard, the fuzzy clustering is used to classify the components in the mixture based on the similarities in the critical properties. The mixing rules are then applied to find group properties. Two different approaches for components association in clustering process are investigated with several numbers of groups. The mathematical validity of the groups is controlled... 

    Challenges of fluid phase behavior modeling in Iranian retrograde gas condensate reservoirs

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 37, Issue 6 , Feb , 2015 , Pages 663-669 ; 15567036 (ISSN) Nasriani, H. R ; Asadi, E ; Nasiri, M ; Khajenoori, L ; Masihi, M ; Sharif University of Technology
    Taylor and Francis Inc  2015
    Abstract
    Production from gas condensate reservoirs requires precise determination of reservoir fluid properties along with their positive impact on real reservoir performance evaluation and fluid in place volume calculation. This fact is particularly important because liquid drop out phenomena occurs as a result of pressure drop due to fluid production and condensate remains in reservoir [Mohebzadeh, 2005. In this study the challenges and problems of fluid phase behavior simulation in southern Iranian retrograde gas condensate reservoirs is discussed. Most of the problems and challenges are inaccuracy of equation of states near the critical point, special conditions and produced fluid flow... 

    Droplet condensation on chemically homogeneous and heterogeneous surfaces

    , Article Journal of Applied Physics ; Volume 120, Issue 12 , 2016 ; 00218979 (ISSN) Ashrafi, A ; Moosavi, A ; Sharif University of Technology
    American Institute of Physics Inc  2016
    Abstract
    Nucleation and growth of condensing droplets on horizontal surfaces are investigated via a 2-D double distribution function thermal lattice Boltzmann method. First, condensation on completely uniform surface is investigated and different mechanisms which cause dropwise and filmwise condensation are studied. The results reveal the presence of cooled vapor layer instability in the condensation on completely smooth surfaces. In the second step, condensation on chemically heterogeneous surfaces is investigated. Moreover, the effect of non-uniformity in the surface temperature is also studied. The results indicate that the vapor layer instability and the nucleation start from the heterogeneities.... 

    Swirl intensity as a control mechanism for methane purification in supersonic gas separators

    , Article Journal of Natural Gas Science and Engineering ; Volume 83 , 2020 Ghorbanian, K ; Amini Magham, M ; Sharif University of Technology
    Elsevier B.V  2020
    Abstract
    Supersonic gas separator is proposed for methane purification. One-dimensional analysis is performed to examine the design aspects associated with the converging-diverging nozzle and the liquid separation chamber. The results indicate that at low swirl intensities, the separation chamber length is about 100 times of the nozzle throat. Increasing the swirl intensity would lower this length sharply and it will be less than 10 for swirl intensity of unity which is equivalent to a swirl angle of 45°. In addition, a sensitivity analysis of the separator performance to the inlet conditions like the temperature, pressure, and composition of the mixture is carried out. It is observed that increasing...