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Akhlaghi M.,Islamic Azad University at Omidieh
Journal of Modern Optics | Year: 2015

Using particle swarm optimization method, an optimized gain ripple was found for two-sided coupled integrated spaced sequence of Si and Si1-xGex microring resonator Raman amplifier. This amplifier had two sides of ring resonators, each consisting of eight rings. On the one side, the microrings were made of Si, and on the other, they were constructed from microSiGe rings. Resonance frequencies of a ring in Si row were equal to those of a ring in the SiGe row; therefore, for a ring of the first row and a ring of the second row, only one pump was used. © 2014 Taylor & Francis. Source


Cheraghian G.,Islamic Azad University at Omidieh
Petroleum Science and Technology | Year: 2016

The resources of heavy oil in the world are more than twice those of conventional light crude oil and the technology utilized for the recovery of heavy oil has steadily increased recovery rates. Polymer flooding is the most commonly applied chemical enhanced heavy oil recovery technique. However, still there is a need for a large amount of polymer, leading to high operational costs, presenting a big challenge in technologies. This challenge can be addressed by considering the newly emerging nanomaterials especially those made from silica. In this work, the author focuses on roles of silica nanoparticles on polymer viscosity and improvement of recovery in heavy oil recovery. The author presents the results obtained from a coreflood experiment with polymer injection in heavy oil at 1320 mPa.sec viscosity. The results indicate that polymer flooding with higher viscosity can significantly improve oil recovery. These laboratory results will be helpful for the planning of nano silica polymer flooding for heavy oil reservoirs. Also flooding test showed a 8.3% increase in oil recovery for nanosilica polymer solution in comparison with polymer solution after one pore volume fluid injection. © 2016 Taylor & Francis Group, LLC. Source


Cheraghian G.,Islamic Azad University at Omidieh
Petroleum Science and Technology | Year: 2015

The nanotechnology has been widely used in several other industries, and the interest in the oil industry is increasing. Nanotechnology has the potential to profoundly change enhanced oil recovery (EOR) and to improve mechanism of recovery, and it chosen as an alternative method to unlock the remaining oil resources and applied as a new EOR method in last decade. Conventional production procedures give access to on average only one-Third of the original oil in place, the use of surfactants and polymers allows for recovery of up to another third of this oil. Chemical flooding is of increasing interest and significance due to high oil prices and the need to increase oil production. Objective of this research is Identification of potential of nanoclay as an appropriate agent for improving the efficiency of surfactant polymer flooding in five-spot glass micromodels. In this work a series of solvent injection experiments was conducted on horizontal glass micromodels at same conditions. Observations showed that in the case of nanoclay concentration, the nanoparticles concentration increased the slope of recovery curve and consequently improved the final oil recovery. Also, the results of experiments illustrated that improvement of heavy oil recovery in micromodel test with nanoclay (60.6%). © 2015 Taylor & Francis Group, LLC. Source


Cheraghian G.,Islamic Azad University at Omidieh
Petroleum Science and Technology | Year: 2016

Nanotechnology has the potential to profoundly change enhanced oil recovery and to improve mechanism of recovery, and it is chosen as an alternative method to unlock the remaining oil resources and applied as a new enhanced oil recovery method in last decade. The objective of this research is identification of potential of nanotitanium dioxide as an appropriate agent for improving the efficiency of surfactant flooding in five-spot glass micromodels. In this work a series of solvent injection experiments was conducted on horizontal glass micromodels at same conditions. Surfactant solutions and newly developed nanosurfactant solutions with 1600-2000 ppm sodium dodecyl sulfate were tested. Observations showed that nanotitanium dioxide has appropriate performance in enhancing the oil recovery at surfactant solution, near critical micelle concentration conditions. Also The results of experiments illustrated improvement of heavy oil recovery in micromodel test with nanotitanium dioxide (51.0%). © 2016 Taylor & Francis Group, LLC. Source


Shirazi M.M.A.,Islamic Azad University at Omidieh | Kargari A.,Amirkabir University of Technology | Tabatabaei M.,Agricultural Biotechnology Research Institute of Iran
Chemical Engineering and Processing: Process Intensification | Year: 2014

In this study, nine flat-sheet commercially available hydrophobic PTFE membranes were used in desalination by direct contact membrane distillation and their characteristics were investigated under different operating conditions including feed temperature, feed flow rate, cold stream flow rate, and feed concentration. Membrane properties, i.e. pore size, thickness, support layer, and salt rejection were also studied. Moreover, membrane module designs including flow arrangements (co-current, counter-current and tangential) for process liquid and depth both on hot and cold sides were tested experimentally. Finally, the long-term performance of the selected membranes for direct contact membrane distillation as a stand-alone desalination process was investigated. The results indicated that increasing feed temperature, hot feed flow rate, and module depth on the cold side led to increase permeate flux. On the other hand, increasing membrane thickness and module depth on the hot side (at constant flow rate) had negative effects on the flux. The highest permeation flux and salt rejection was achieved when the membranes with a pore size of 0.22. μm were used in the cross-current follow arrangement of hot and cold streams. In addition, the requirements for support layer for a successful DCMD process has been extensively discussed. © 2013 Elsevier B.V. Source

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