Search for: pore-blocking
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    Pore-scale analysis of filtration loss control by colloidal gas aphron nano-fluids (CGANF) in heterogeneous porous media

    , Article Experimental Thermal and Fluid Science ; Volume 77 , 2016 , Pages 327-336 ; 08941777 (ISSN) Tabzar, A ; Ghazanfari, M. H ; Sharif University of Technology
    Elsevier Inc  2016
    This study concerns micro-scale analysis of filtration loss control induced by blockage ability of a new colloidal gas fluid, Colloidal Gas Aphron Nano-Fluid (CGANF) in fractured porous media. Fumed silica nanoparticles and a novel environmentally friendly bio surfactant, Olea Europaea, were used for monitoring CGANF displacements in heterogeneous micromodels including single fracture. Analysis of pressure drop along the micromodel during tests showed an increasing resistance to flow of CGANF dispersion through porous media as more CGANF was injected. When lamella division occurs, more small bubbles are formed and then pressure drop through porous media increases. Small bubbles play an... 

    Analysis of fouling and flux behavior in cross-flow microfiltration of nonalcoholic beer by ceramic membrane

    , Article Sustainable Membrane Technology for Energy, Water, and Environment ; JAN , 2012 , Pages 157-167 ; 9781118024591 (ISBN) Yazdanshenas, M ; Tabatabaei Nejad, S. A. R ; Soltanieh, M ; Fillaudeau, L ; Sharif University of Technology
    John Wiley and Sons  2012

    Artificial intelligence vs. Classical approaches: A new look at the prediction of flux decline in wastewater treatment

    , Article Desalination and Water Treatment ; Volume 51, Issue 40-42 , 2013 , Pages 7476-7489 ; 19443994 (ISSN) Mashhadi Meighani, H ; Dehghani, A ; Rekabdar, F ; Hemmati, M ; Goodarznia, I ; Sharif University of Technology
    Taylor and Francis Inc  2013
    This study compares the performance of three different approaches to modeling namely the classical pore-blocking models, artificial neural networks (ANN) and the novel genetic programming (GP) approach. Among the available models proposed by Hermia, standard pore-blocking and cake filtration models were opted because of their better fitness with experimental measurements. A feedforward backpropagation network using Bayesian Regulation as well as Levenberg-Marquardt training methods was developed based on the experimental results. Network inputs include the controlling parameters of permeate flux namely: temperature, transmembrane pressure, crossflow velocity, pH, and filtration time. The... 

    Permeability impairment study due to asphaltene deposition: experimental and modeling approach

    , Article Transport in Porous Media ; Volume 91, Issue 3 , February , 2012 , Pages 999-1012 ; 01693913 (ISSN) Bolouri, S. H ; Ghoodjani, E ; Sharif University of Technology
    This fact is well known that during any scenario of production, asphaltene deposition in porous media has a substantial effect on oil flow. But a clear understanding of asphaltene deposition mechanisms can help to minimize asphaltenic problem in oil-bearing formations. In this study, the experimental results of three dynamic CO 2 miscible injection tests were investigated. Regarding the effects of adsorption, mechanical entrapment, and sweeping mechanisms on permeability behavior, a mathematical mass and permeability variation model were developed. According to the experimental results asphaltene deposition causes a 70% loss of sand stone initial permeability while the loss is significantly... 

    Bench-scaled nano-Fe 0 permeable reactive barrier for nitrate removal

    , Article Ground Water Monitoring and Remediation ; Volume 31, Issue 4 , 2011 , Pages 82-94 ; 10693629 (ISSN) Hosseini, S. M ; Ataie Ashtiani, B ; Kholghi, M ; Sharif University of Technology
    There are many fundamental problems with the injection of nano-zero-valent iron (NZVI) particles to create permeable reactive barrier (PRB) treatment zone. Among them the loss of medium porosity or pore blocking over time can be considered which leads to reduction of permeability and bypass of the flow and contaminant plume up-gradient of the PRB. Present study provides a solution for such problems by confining the target zone for injection to the gate in a funnel-and-gate configuration. A laboratory-scale experimental setup is used in this work. In the designed PRB gate, no additional material from porous media exists. NZVI (d 50 = 52 ± 5 nm) particles are synthesized in water mixed with...