Solute Transport With Chemical Reaction in Singleand Multi-Phase Flow in Porous Media

El-Amin, Mohamed F.; Salama, Amgad; Sun, Shuyu

doi:10.5772/14203

Cited by 15 publications

(11 citation statements)

References 43 publications

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“…A known mass of fatty acids and a predetermined volume of methanol were transferred to the reactor chamber, followed by the addition of Bi 2 O 3 . The reaction mixture was kept under stirring at 500 rpm for 2 h at the desired reaction temperature, agitation under which no mass transfer limitations are expected to occur in biphasic systems such as those observed during biodiesel synthesis . Then, after reaction completion, the solids were separated from the reaction mixture by centrifugation and the excess alcohol was removed from the supernatant by evaporation under reduced pressure at 50 °C.…”

Section: Experimental Sectionmentioning

confidence: 99%

Esterification of Fatty Acids Using a Bismuth-Containing Solid Acid Catalyst

et al. 2013

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The conversion of lauric acid and fatty acid mixtures to methyl esters was investigated using bismuth-containing solid catalysts obtained from Bi 2 O 3 . When the reaction was carried out at 140 °C for 2 h using a methanol:fatty acid molar ratio of 2:1 and 5 wt % of Bi 2 O 3 in relation to the mass of fatty acids, conversions up to 87 wt % were achieved even after four consecutive reaction cycles. Besides the observed catalytic activity, the bismuth-containing solid catalyst was also amenable to recycling for at least four reaction cycles without significant loss of its catalytic performance. However, the analysis of the recovered solids by X-ray diffraction and Fourier transform infrared spectroscopy demonstrated that Bi 2 O 3 was converted to layered bismuth carboxylates, which acted as the actual esterification catalyst. On the basis of these, layered bismuth carboxylates unfold as a suitable catalytic system for the esterification of fatty acids and lipid sources of high acid number.

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Section: Experimental Sectionmentioning

confidence: 99%

Esterification of Fatty Acids Using a Bismuth-Containing Solid Acid Catalyst

et al. 2013

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“…The framework that is usually adapted to studying these multiphase systems in porous media is generally based on the ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T 4 continuum hypothesis in which overlapping continua of the phases interact with each other. In this framework, macroscopic variables represent continuous functions of space and time [e.g., [1][2][3][4][5][6][7]. Within this framework all the complexities of multiphase systems in porous media have been, in practice, lumped into only one parameter; called relative permeability, which has been assumed, primarily, function of saturation of respective phases.…”

Section: Introductionmentioning

confidence: 99%

Flow split characterization of two immiscible phases with different wettability scenarios: A numerical investigation using a coupled Cahn–Hilliard and Navier–Stokes system

Bao

Salama

Sun

2018

International Journal of Multiphase Flow

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 The flow of a two-phase system is considered in a Y-shaped channel  When the wettability conditions are symmetric, the two phase system splits symmetrically  When it is different, the two-phase system splits unsymmetrically  A diffuse-interface framework is used in this study  Mixed finite element is used for spatial discretization and higher order, time splitting scheme is used for time.

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“…Although variables at the porous media scale represent averaged quantities of pore scale quantities within a representative volume [e.g., [1][2][3], at the pore scale, such averaging is not required and primitive investigation could highlight more insight into multiphase flows at porous media scale. We highlight two main issues; the first is related to the effect of the thickness of the precursor layer and the second on the effects of different wettability conditions of the precursor fluid layer on flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effects of a Precursor Wetting Film on the Displacement of Two Immiscible Phases Along a Channel

Bao

Salama

Sun

2015

Flow Turbulence Combust

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A set of numerical experiments has been conducted to study the effect of a precursor fluid layer on the motion of two phase system in a channel. This system is characterized by coupled CahnHillard and Navier-Stokes system together with slip boundary conditions. The solution of the governing equation involves first the solution of Cahn-Hillard equation with semi-implicit and Mixed finite element discritization with a convex splitting scheme. The Navier-Stokes equations are then solved with a P2-P0 mixed finite element method. Three cases have been investigated; in the first the effect of different wettability scenarios with no precursor layer has been investigated. In the second scenario, the effect of the precursor layer for different wettability conditions is investigated. In the third case, the effect of the thickness of the precursor layer is investigated. It is found that, wettability conditions have considerable effect on the flow of the considered two-phase system. Furthermore the existence of the precursor layer has additional influence on the breakthrough of the phases.

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Solute Transport With Chemical Reaction in Singleand Multi-Phase Flow in Porous Media

Cited by 15 publications

References 43 publications

Esterification of Fatty Acids Using a Bismuth-Containing Solid Acid Catalyst

Esterification of Fatty Acids Using a Bismuth-Containing Solid Acid Catalyst

Flow split characterization of two immiscible phases with different wettability scenarios: A numerical investigation using a coupled Cahn–Hilliard and Navier–Stokes system

Numerical Investigation on the Effects of a Precursor Wetting Film on the Displacement of Two Immiscible Phases Along a Channel

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