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Frontiers of Chemical Science and Engineering 2014年第3期8卷 320-329页

作者： Ali SHAHMOHAMMADI arezou jafari Chemical Engineering Department Tarbiat Modares University Tehran 114-14115 Iran

In this work, the effect of baffles in a pipe on heat transfer enhancement was studied using computa- tional fluid dynamics （CFD） in the presence of Al2O3 nanoparticles which are dispersed into water. Fluid flow through the horizontal tube with uniform heat flux was simulated numerically and three dimensional governing partial differential equations were solved. To find an accurate model for CFD simulations, the results obtained by the single phase were compared with those obtained by three different multiphase models including Eulerian, mixture and volume of fluid （VOF） at Reynolds numbers in range of 600 to 3000, and two different nanoparticle concentrations （1% and 1.6%）. It was found that multi- phase models could better predict the heat transfer in nanofluids. The effect of baffles on heat transfer of nanofluid flow was also investigated through a baffled geometry. The numerical results show that at Reynolds numbers in the range of 600 to 2100, the heat transfer of nanofluid flowing in the geometry without baffle is greater than that of water flowing through a tube with baffle, whereas the difference between these effects （nanofluid and baffle） decreases with increasing the Reynolds number. At higher Reynolds numbers （2100-3000） the baffle has a greater effect on heat transfer enhancement than the nanofluid.

关键词： CFD simulation heat transfer nanofluid,baffle single phase model multiphase model

Temperature effect on performance of nanoparticle/surfactant flooding in enhanced heavy oil recovery

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Petroleum Science 2019年第6期16卷 1387-1402页

作者： Sajjad Mahmoudi arezou jafari Soheila Javadian Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Physical Chemistry Faculty of Basic ScienceTarbiat Modares UniversityP.O.Box 14115-175TehranIran

Recently,nanoparticles have been used along with surfactants for enhancing oil *** the recent studies show that oil recovery is enhanced using nanoparticle/surfactant solutions,some effective parameters and mechanisms involved in the oil recovery have not yet been ***,the temperature effect on the stability of nanoparticle/surfactant solutions and ultimate oil recovery has been studied in this work,and the optimal concentrations of both SiO2 nanoparticle and surfactant(sodium dodecyl sulfate)have been determined by the Central Composite Design *** addition,the simultaneous effects of parameters and their interactions have been *** of the stability of the injected solutions indicates that the nanoparticle concentration is the most important factor affecting the solution *** surfactant makes the solution more stable if used in appropriate concentrations below the *** to the micromodel flooding results,the most effective factor for enhancing oil recovery is temperature compared to the nanoparticle and surfactant ***,in floodings with higher porous medium temperature,the oil viscosity reduction is considerable,and more oil is *** addition,the surfactant concentration plays a more effective role in reservoirs with higher *** other words,at a surfactant concentration of 250 ppm,the ultimate oil recovery is improved about 20%with a temperature increase of 20°***,when the surfactant concentration is equal to 750 ppm,the temperature increase enhances the ultimate oil recovery by only about 7%.Finally,the nanoparticle and surfactant optimum concentrations determined by Design-Expert software were equal to 46 and 159 ppm,*** is worthy to note that obtained results are validated by the confirmation test.

关键词： Enhanced heavy oil recovery Nanoparticle Surfactant Temperature High salinity brine Stability Micromodel Experimental design

Wettability alteration analysis of smart water/novel functionalized nanocomposites for enhanced oil recovery

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Petroleum Science 2020年第5期17卷 1318-1328页

作者： Sara Habibi arezou jafari Zahra F.akhroueian Chemical Engineering Faculty Tarbiat Modares UniversityTehranIran School of Chemical Engineering College of EngineeringInstitute of Petroleum EngineeringUniversity of TehranTehranIran

Smart water flooding,as a popular method to change the wettability of carbonate rocks,is one of the interesting and challenging issues in reservoir *** addition,the recent studies show that nanoparticles have a great potential for application in EOR ***,little research has been conducted on the use of smart water with nanoparticles in enhanced oil *** this study,stability,contact angle and IFT measurements and multi-step core flooding tests were designed to investigate the effect of the ionic composition of smart water containing SO4^2- and Ca^2+ ions in the presence of nanofluid on EOR *** amine/organosiloxane@Al2O3/SiO2(AOAS) nanocomposite previously synthesized using co-precipitation-hydrothermal method has been used ***,for the first time the application of this nanocomposite along with smart water has been studied in this *** show that by increasing the concentrations of calcium and sulfate ions in smart water,oil recovery is improved by 9% and 10%,respectively,compared to *** addition,the use of smart water and nanofluids simultaneously is very effective on increasing oil ***,the best performance was observed in smart water containing two times of sulfate ions concentration(SW2 S) with nanofluids,showing increased efficiency of about 7.5%.

关键词： Smart water Nanofluid Wettability alteration Contact angle Stability Enhanced oil recovery

Nanoparticles assisted microwave radiation:Fluid-rock interactions in oil reservoirs

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Petroleum Science 2021年第6期18卷 1797-1812页

作者： Hamzeh Shamsi Armandi arezou jafari Reza Gharibshahi Faculty of Chemical Engineering Tarbiat Modares UniversityTehranIran

Recently,many researchers have focused on the usage of electromagnetic waves in oil production and well stimulation,but so far the effect of these waves on the fluid and rock interaction and its simultaneous effect with nanoparticles have not been ***-rock interaction is one of the most important factors affecting fluid distribution in the *** this study,the oil reservoir rock wettability alteration under electromagnetic heating and the presence of nanoparticles has been *** nanoparticles of TiO_2,Fe_(3)O_(4),and TiO_2/Fe_(3)O_(4)have been ***_2 nanoparticles are commercially available,and the other mentioned nanoparticles are synthesized via a co-precipitation *** acid has been used to modify surfaces of nanoparticles and stabilize them in water as the base ***,the adsorption of the nanoparticles on the rock surface has been *** the next step,the amount of oil outflow from the rock has been measured and reported as the external fluid *** this process,the nanoparticle performance in wettability alteration was investigated using pH and inductively coupled plasma(ICP)*** better understand the governing mechanisms,oil viscosity was measured by mixing the oil with nanoparticles and put under *** results reveal that the microwave has a great ability to reduce oil contact angle with carbonate *** the presence of0.2 wt%Fe_(3)O_(4)nanoparticles,the contact angle was reduced from 155°to 19°after 28 min of irradiation,indicating strong rock ***,microwave irradiation on Fe_(3)O_(4)nanofluid extracts75%of the oil from the *** microwave radiation,the pH of the nanofluid increases and hence,more nanoparticles are adsorbed on the rock which subsequently causes more rock *** viscosity change results prove that there is an optimal irradiation time of 5 min in which oil viscosity reduces from 481 cP to 410 cP and then increases to 827

关键词： Microwave radiation Wettability alteration Nanoparticle adsorption Rock-fluid interaction

Application of CFD technique to simulate enhanced oil recovery processes:current status and future opportunities

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Petroleum Science 2020年第2期17卷 434-456页

作者： arezou jafari Mohammadreza Hasani Mostafa Hosseini Reza Gharibshahi Faculty of Chemical Engineering Tarbiat Modares UniversityTehranIran

Nowadays,because of the reduction in oil resources and the passage of the first and second life period of current reservoirs,using enhanced oil recovery(EOR)methods is of great *** recent years,due to the developments in technology and the advent of powerful computers,using simulation methods in enhanced oil recovery processes is on the *** computational fluid dynamics(CFD)method,as a branch of fluid mechanics,is a suitable method for studying and simulating EOR *** this study,a review was done on the application of CFD studies for simulating EOR ***,potentials for future studies and the challenges researchers may face in this method were *** using this method in enhanced oil recovery processes has recently started,different areas for more studies still *** optimize the usage of this method in future studies,the necessity of multiphase models and solution methods development,as well as considering all microscopic parameters such as interfacial tension and viscosity in investigating oil recovery factor is of great importance.

关键词： Enhanced oil recovery Computational fluid dynamics Oil recovery factor Thermal methods Chemical methods Flooding methods

Kinetic studies on extra heavy crude oil upgrading using nanocatalysts by applying CFD techniques

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Chinese Journal of Chemical Engineering 2018年第2期26卷 343-355页

作者： Javad Aminian Dehkordi arezou jafari Seyyed Amir Sabet Fatemeh Karami Faculty of Chemical Engineering Tarbiat Modares UniversityTehranIran Islamic Azad University ShahroodIran

Regarding the growth of global energy consumption and the paucity of light crude oil, extracting and using heavy and extra heavy crude oil has received much more attention, but the application of this kind of oil is complicated due to its very high molecular weight. High viscosity and low flowability complicate the transportation of heavy and extra heavy crude oil. Accordingly, it is essential to reduce the viscosity of heavy and extra heavy crude oil through in-situ operations or immediate actions after extraction to reduce costs. Numerical simulations are influential methods, because they reduce calculation time and costs. In this study, the cracking of extra heavy crude oil using computational fluid dynamics is simulated, and a unique kinetic model is proposed based on experimental procedures to predict the behavior of extra heavy crude oil cracking reaction. Moreover, the hydrodynamics and heat transfer of the system and influence of nanocatalysts and temperature on the upgrading of crude oil are studied. The geometry of a reactor is produced using commercial software, and some experiments are performed to examine the validity and accuracy of the numerical results. The findings reveal that there is a good agreement between the numerical and experimental results. Furthermore, to investigate the main factors affecting the process, sensitivity analysis is adopted. Results show that type of catalyst and concentration of catalyst are the parameters that influence the viscosity reduction of extra heavy crude oil the most. The findings further revealed that when using a 25 nm SiO_2 nanocatalyst, a maximum viscosity reduction of 98.67% is observed at 623 K. Also, a catalyst concentration of 2.28 wt% is best for upgrading extra heavy crude oil. The results obtained through sensitivity analysis, simulation model, and experiments represent effectual information for the design and development of high performance upgrading processes for energy applications.

关键词： Upgrading Extra heavy oil Simulation Nanocatalyst

低渗透含水层储气库储气过程中气-水-岩相互作用及储气量影响因素

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石油勘探与开发 2018年第6期45卷 1053-1058页

作者： TOOSEH Esmaeel Kazemi jafari arezou TEYMOURI Ali Petroleum Engineering Department Chemical Engineering FacultyTarbiat Modares UniversityTehranIran National Iranian Gas Company TehranIran

利用室内岩心实验研究了低渗透含水层储气库天然气储气过程中气-水-岩相互作用以及影响储气过程的主要参数。研究表明,实验条件下储气量占岩心孔隙体积的百分比为6%～20%。注气速度对储气量有重要影响,注气速度较高时,储气量较高。提高... 详细信息

利用室内岩心实验研究了低渗透含水层储气库天然气储气过程中气-水-岩相互作用以及影响储气过程的主要参数。研究表明,实验条件下储气量占岩心孔隙体积的百分比为6%～20%。注气速度对储气量有重要影响,注气速度较高时,储气量较高。提高压力也会使储气量增加。统计分析表明,注气速度比压力对储气量的影响更大。储气时间对储气过程也有影响,长期储存后会有大部分天然气滞留在储集层中无法被采出。原子吸收光谱分析表明,将天然气注入盐水饱和岩心的过程中,盐水中的离子浓度和水蒸发量增大,可能形成沉淀物,降低岩石的孔隙度和渗透率。气相色谱分析表明,在岩心中储存后,天然气中二氧化碳浓度降低,甲烷浓度增加。

关键词：地下储气库天然气储气量含水层注气速度注气压力

Seismic control of multi-degrees-of-freedom structures by vertical mass isolation method using MR dampers

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 503-510页

作者： Mohamad Shahrokh Abdi Masoud Nekooei Mohammad-Ali jafari Department of Civil Engineering Marivan BranchIslamic Azad UniversityMarivan ***Iran Department of Civil Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran Structural Department of Transmission and Distribution Research Center Niroo Research Institute(NRI)Tehran ***Iran

Vertical mass isolation(VMI)is one of the novel methods for the seismic control of *** this method,the entire structure is assumed to consist of two mass and stiffness subsystems,and an isolated layer is located among *** this study,the magnetorheological damper in three modes:passive-off,passive-on,and semi-active mode with variable voltage between zero and 9 volts was used as an isolated layer between two ***-degrees-of-freedom structures with 5,10,and 15 floors in two dimensions were examined under 11 pairs of near field *** each level,the displacement of MR dampers was taken into *** responses of maximum displacement,maximum inter-story drift,and maximum base shear in controlled and uncontrolled buildings were compared to assess the suggested approach for seismic control of the *** to the results,the semi-active control method can reduce the response by more than 12%compared to the uncontrolled mode in terms of maximum displacement of the mass subsystem of the *** method can reduce more than 16%and 20%of the responses compared to the uncontrolled mode in terms of maximum inter-story drift and base shear of the structure,respectively.

关键词： seismic control vertical mass isolation base shear magnetorheological damper semi-active control

The Effect of Spironolactone Loading on the Properties of 3D-Printed Polycaprolactone/Gold Nanoparticles Composite Scaffolds for Myocardial Tissue Engineering

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Journal of Bionic Engineering 2024年第2期21卷 924-937页

作者： Sharareh Ghaziof Shahrokh Shojaei Mehdi Mehdikhani Mohammad Khodaei Milad jafari Nodoushan Department of Biomedical Engineering Central Tehran BranchIslamic Azad UniversityTehran***Iran Stem Cells Research Center Tissue Engineering and Regenerative Medicine InstituteCentral Tehran BranchIslamic Azad UniversityTehran***Iran Department of Biomedical Engineering Faculty of EngineeringUniversity of IsfahanIsfahan***Iran Materials Engineering Group Golpayegan College of EngineeringIsfahan University of TechnologyGolpayegan87717-67498Iran Hard Tissue Engineering Research Center Tissue Engineering and Regenerative Medicine InstituteCentral Tehran BranchIslamic Azad UniversityTehran***Iran

Engineered cardiac constructs(ECC)aid in the progression of regenerative medicine,disease modeling and targeted drug delivery to adjust and aim the release of remedial combination as well as decrease the side effects of *** this research,polycaprolactone/gold nanoparticles(PCL/GNPs)three-dimensional(3D)composite scaffolds were manufactured by 3D printing using the fused deposition modeling(FDM)method and then coated with gelatin/spironolactone(GEL/SPL).Scanning electron microscopy(SEM)and Fourier transform-infrared spectroscopy(FTIR–ATR)were applied to characterize the ***,drug release,biodegradation,behavior of the myoblasts(H9C2)cell line,and cytotoxicity of the 3D scaffolds were *** microstructural observation of the scaffolds reported interconnected pores with 150–300µm in *** 3D scaffolds were degraded significantly after 28 days of immersion in stimulated body fluid(SBF),with the maximum rate of GEL-coated 3D *** release from cross-linked GEL coating demonstrated the excess of drug release over time,and according to the control release systems,the drug delivery systems(DDS)went into balance after the 14th *** addition,cell culture study showed that with the addition of GNPs,the proliferation of(H9C2)was enhanced,and with GEL/SPL coating the cell attachment and viability were improved *** findings suggested that PCL/GNPs 3D scaffolds coated with GEL/SPL can be an appropriate choice for myocardial tissue engineering.

关键词： Polycaprolactone Gold nanoparticles Drug delivery systems Spironolactone Cell behavior Myoblasts

Breeding maize of ideal plant architecture for high-density planting tolerance through modulating shade avoidance response and beyond

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Journal of Integrative Plant Biology 2024年第5期66卷 849-864页

作者： Fereshteh jafari Baobao Wang Haiyang Wang Junjie Zou Biotechnology Research Institute Chinese Academy of Agricultural SciencesBeijing 100081China Graduate School of Chinese Academy of Agricultural Sciences Beijing 100081China National Nanfan Research Institute CAASSanya 572025China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life SciencesSouth China AgriculturalUniversityGuangzhou 510642China

Maize is a major staple crop widely used as food,animal feed,and raw materials in industrial ***-density planting is a major factor contributing to the continuous increase of maize ***,high planting density usually triggers a shade avoidance response and causes increased plant height and ear height,resulting in lodging and yield *** plant height and ear height,more erect leaf angle,reduced tassel branch number,earlier flowering,and strong root system architecture are five key morphological traits required for maize adaption to high-density *** this review,we summarize recent advances in deciphering the genetic and molecular mechanisms of maize involved in response to high-density *** also discuss some strategies for breeding advanced maize cultivars with superior performance under high-density planting conditions.

关键词： flowering time high-density planting leaf angle maize plant architecture plant height/ear height root architecture tasselbranch