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A three dimensional CFD modeling of hydrodynamics and mass transfer in a gas-liquid impeller stirred tank reactor
, Article CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN) ; Bozorgmehry Boozarjomehry, R ; Kazemeini, M ; Sharif University of Technology
2006
Abstract
Multiphase impeller stirred tank reactors enhance mixing of reacting species used in a variety of chemical industries. Gas-liquid mixing and mass transfer between these phases is an important application in reactor design. One such an example is hydrogenation reaction of aqueous NDMA (Nitroso dimethyl amine) solution in which one of the parameters having a significant effect on the reaction rate is mass transfer. This parameter in turn is a function of impeller shape and rotational speed, gas flow rate and reactor scale. Computational Fluid Dynamics (CFD) is a useful tool in the analysis, design and scale up of stirred tank reactors via investigating hydrodynamics of gas and liquid flow,...
Determination of the Optimal Conditions for Treatment of Lubricating Oils Wastewater in a Continuous Electrocoagulation Reactor
, M.Sc. Thesis Sharif University of Technology ; Fotovat, Farzam (Supervisor)
Abstract
Electrocoagulation (EC) is an effective process in the treatment of oily wastewater, however, only a few studies have explored the parameters affecting the efficient design of the reactors employed in this process. In this study, a statistical investigation on the factors affecting the design of a continuous electrocoagulation reactor was performed by running the tests designed based on the design of experiments (DOE) principles. The explored design variables were current density (30-80 A/m2), reactor residence time (10-30 min), and the ratio of anode surface to the reactor volume (15-45 m2/m3), which were optimized by the response surface method (RSM) to maximize the amount of oil removal...
Novel type of four-impinging-jets reactor for Oxidative desulfurization of light fuel oils
, Article Industrial and Engineering Chemistry Research ; Volume 49, Issue 19 , 2010 , Pages 9339-9348 ; 08885885 (ISSN) ; Molaei Dehkordi, A ; Shahrokhi, M ; Ebrahimi, A. A ; Sharif University of Technology
Abstract
A novel type of four-impinging-jets reactor (FIJR) has been proposed and tested successfully for the oxidative desulfurization of kerosene as a typical light fuel oil. The FIJR is characterized by a high-intensity mixing chamber located at the bottom of the reactor and equipped with four impinging jets. The influences of various operating and design parameters such as feed flow rate, internozzle distance, jet diameter, and jet Reynolds number on the performance of the FIJR have been carefully investigated. As a result of both the impinging process and shear forces exerted on the phases, the rate of desulfurization in FIJR increased significantly compared to that obtained by a conventional...
Integrated and inherently safe design and operation of a mobile power generation: Process intensification through microreactor reformer and HT-PEMFC
, Article International Journal of Hydrogen Energy ; Volume 46, Issue 46 , 2021 , Pages 23839-23854 ; 03603199 (ISSN) ; Sharifzadeh, M ; Rashtchian, D ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
In the present study, due to various advantages of process miniaturization, the integrated design and operation of a mobile power generation system consisting of a microreactor reformer and a proton exchange membrane fuel cell (PEMFC) are investigated. The hydrogen fuel is supplied through autothermal steam-reforming of methanol in a microreactor leading to a safer, as well as more efficient, and economical operation. A high-temperature polymer membrane fuel cell with external accessories is applied for power generation. Then, simulation-optimization programming is applied for simultaneously optimizing the process design and operation at the same level. The result shows that the implemented...
Startup of "cANDLE" burnup in a Gas-cooled Fast Reactor using Monte Carlo method
, Article Annals of Nuclear Energy ; Volume 50 , December , 2012 , Pages 44-49 ; 03064549 (ISSN) ; Abbaspour, A ; Pazirandeh, A ; Sharif University of Technology
2012
Abstract
During the past decade, the CANDLE burnup strategy has been proposed as an innovative fuel cycle and reactor design for complete utilization of uranium resources. In this strategy the shapes of neutron flux, nuclide densities and power density distribution remain constant but the burning region moves in axial direction. The feasibility of this strategy has been demonstrated widely by using the diffusion technique in conjunction with nuclide transmutation equations. On the other hand since the Monte Carlo method provides the exact solution to the neutron transport, the Monte Carlo technique is becoming more widely used in routine burnup calculations. The main objective of this work is startup...