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| 1 | NUMERICAL SIMULATION OF FLOW OVER TWO CIRCULAR CYLINDERS IN TANDEM ARRANGEMENT显示文摘In this article,the 2-D unsteady viscous flow around two circular cylinders in a tandem arrangement is numerically simulated in order to study the characteristics of the flow in both laminar and turbulent regimes.The method applied alternatively is based on the finite volume method on a Cartesian-staggered grid.The great source term technique is employed to identify the cylinders placed in the flow field.To apply the boundary conditions,the ghost-cell technique is used.The implemented computational method is firstly validated through simulation of laminar and turbulent flows around a fixed circular cylinder.Finally,the flow around two circular cylinders in a tandem arrangement is simulated and analyzed.The flow visualization parameters,the Strouhal numbers,and drag and lift coefficients are comprehensively presented and compared for different cases in order to reveal the effect of the Reynolds number and gap spacing on the behavior of the flow.The obtained results have shown two completely distinct flow characteristics in laminar and turbulent regimes. | DEHKORDI Behzad Ghadiri MOGHADDAM Hesam Sarvghad JAFARI Hamed Houri | 2011 | Journal of Hydrodynamics2011，23，1： | 11 |
| 2 | 高强电场中液滴静电运动特性显示文摘针对油田生产中含表面活性剂原油电脱水极为困难,缺乏理论指导的现状,采用动态微观实验的方法,研究含表面活性剂的油水系统中液滴在电场力作用下聚并排液的情况,计算液滴的聚结时间,并观测液滴发生形变直至破裂时各个阶段的现象。结果表明,表面活性剂可引起液滴界面排斥力上升,聚并过程中液面出现形变,降低液滴聚结速度。此外,液滴表面所吸附的表面活性剂分子会加剧液滴形变率,降低液滴破裂所需临界场强,并改变液滴破裂机制,增加了次级微小液滴的产生。须严格控制电场强度,以避免液滴变形破裂,提高聚结效率,确保电脱水的效果。 | 张黎明 张凯 李晓帆 Mojtaba Ghadiri Ali Hassanpour | 2011 | 石油学报2011，32，3： | 10 |
| 3 | Hydrogeochemical and multi-tracer investigations of arsenic-affected aquifers in semi-arid West Africa显示文摘The semi-arid Sahel regions ofWest Africa rely heavily on groundwater from shallow to moderately deep (<100 m b.g.l.) crystalline bedrock aquifers for drinking water production.Groundwater quality may be affected by high geogenic arsenic (As) concentrations (>10 μg/L) stemming from the oxidation of sulphide minerals (pyrite,arsenopyrite) in mineralised zones.These aquifers are still little investigated,especially concerning groundwater residence times and the influence of the annual monsoon season on groundwater chemistry.To gain insights on the temporal aspects of As contamination,we have used isotope tracers (noble gases,3H,stable water isotopes (2H,18O)) and performed hydrochemical analyses on groundwater abstracted from tube wells and dug wells in a small study area in southwestern Burkina Faso.Results revealed a great variability in groundwater properties (e.g.redox conditions,As concentrations,water level,residence time) over spatial scales of only a few hundred metres,characteristic of the highly heterogeneous fractured underground.Elevated As levels are found in oxic groundwater of circum-neutral pH and show little relation with any of the measured parameters.Arsenic concentrations are relatively stable over the course of the year,with little effect seen by the monsoon.Groundwater residence time does not seem to have an influence on As concentrations,as elevated As can be found both in groundwater with short (<50 a) and long (>10^3 a) residence times as indicated by 3He/4He ratios spanning three orders of magnitude.These results support the hypothesis that the proximity to mineralised zones is the most crucial factor controlling As concentrations in the observed redox/pH conditions.The existence of very old water portions with residence times >10^3 years already at depths of <50 m b.g.l.is a new finding for the shallow fractured bedrock aquifers of Burkina Faso,suggesting that overexploitation of these relatively low-yielding aquifers may be an issue in the future. | Anja Bretzler Lucien Stolze Julien Nikiema Franck Lalanne Elaheh Ghadiri Matthias S. Brennwald Massimo Rolle Mario Schirmer | 2019 | Geoscience Frontiers2019，10，5： | 2 |
| 4 | Self- assembling organic nanotubes 显示文摘 | Bong D T Clark T D Granja J R Ghadiri M R | 2001 | Angew Chem Int Ed Engl2001，40，6： | 1 |
| 5 | Adsorption of fluoride from water by Al^3+ and Fe^3_ pretreated natural iranian zeolites显示文摘 | Rahmani A Nouri J Kamal Ghadiri S | 2010 | International Journal of Environmental Research2010，4，4： | 1 |
| 6 | Electrostatic enhancement of co-alescence of water dropletsin oil:a reviewof the technology显示文摘 | John S Eow Mojtaba Ghadiri | 2002 | Chemical Engineering Journal2002，，85： | 1 |
| 7 | Artificial transmembrane ion channels from self-assembling peptide nanotubes显示文摘 | Ghadiri M R Granja J R Buehler L K | 1994 | Nature1994，369，： | 1 |
| 8 | Distinct element analysis of attrition of granular solids under shear deformation显示文摘 | Ning Z Ghadiri M | 2006 | Chemical Engineering Science2006，61，18： | 1 |
| 9 | Loading hydrophilic drug in solid lipid media as nanoparticles:Statistical modeling of entrapment efficiency and particle size显示文摘 | Ghadiri M Fatemi S Vatanara A | 2012 | Int J Pharm2012，424，12： | 1 |
| 10 | Experimental studies of deformation and break-up of aqueous drops in high electric fields显示文摘 | John S Eow Mojtaba Ghadiri Adel Sharif | 2003 | Colloids and Surfaces A: Physicochemical and Engineering Aspects2003，，1： | 1 |
| 11 | Self-as sembly of peptide based nanotubles显示文摘 | BARIAK J M GHADIRI M R | 1997 | Materials science and engineering1997，，4： | 1 |
| 12 | Electrostatic enhancement of coalescence of water droplets in oil: a review of the technology显示文摘 | John S. Eow Mojtaba Ghadiri | 2002 | Chemical Engineering Journal2002，，2： | 1 |
| 13 | Effect of exercise on diabetes-induced oxidative stress in the rat hippocampus 显示文摘 | Alipour M Salehi I Ghadiri Soufi F | 2012 | Iran Red Crescent Med J2012，14，4： | 1 |
| 14 | The effects of operating conditions on the milling of microcrystalline cellulose显示文摘 | KWAN CC GHADIRI M PAPADOPOULOS DG | 2003 | Chemical Engineering and Technology2003，26，2： | 1 |
| 15 | Electro-hydrodynamic separation of aqueous drops from flowing viscous oil 显示文摘 | Eow J S Ghadiri M Sharif A O | 2007 | Journal of Petroleum Science and Engineering2007，55，1： | 1 |
| 16 | Hv-SEMIGROUP STRUCTURE ON F2-OFFSPRING OF A GENE POOL显示文摘 | M. GHADIRI B. DAVVAZ R. NEKOUIAN | 2012 | International Journal of Biomathematics2012，5，4： | 1 |
| 17 | The influence of grass and porous barrier strips on runoff hydrology and sediment transport显示文摘 | GHADIRI H ROSE C W HOGARTH W L | 2001 | Transactions of the ASAE2001，44，2： | 1 |
| 18 | Efficacy and safety of nal- oxone in the management of postseizure complaints of tramadol intoxicated patients: a self-controlled study显示文摘 | Saidi H Ghadiri M Abbasi S Ahmadi SF | 2010 | Emerg Med J2010，27，12： | 1 |
| 19 | Effect of the impact angle on the breakage of agglomerates:a numerical study using DEM显示文摘 | Moreno R Ghadiri M Antony S J | 2003 | Powder Technology2003，130，： | 1 |
| 20 | Chemistry at the crossroads显示文摘 | Ghadiri M R Tirrell D A | 2000 | Curr Opin Chem Biol2000，4，： | 1 |
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