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Laurent Falk - One of the best experts on this subject based on the ideXlab platform.

  • Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel
    Chemical Engineering Research and Design, 2018
    Co-Authors: Carlos Baqueiro, Nelson Ibaseta, Pierrette Guichardon, Laurent Falk
    Abstract:

    This work studies how deeply the reagents choice influences micromixing characterisation by the Villermaux-Dushman method, when applying it to a 1 litre stainless steel standard vessel with two baffles, stirred by an inclined Blade Turbine. For the first time, borate and phosphate buffer are compared on their use in the method. It is observed that triiodide production is higher when borate buffer is used. Moreover, perchloric acid leads to higher triiodide production than sulphuric acid, when injecting the same concentration of both acids. Finally, the influence of the ionic strength is also studied, since there has been a great deal of controversy about it over the last years. The results show that the ionic strength affects triiodide production, although relatively slightly. Advice concerning the choice of the reagents is given in conclusion.

  • Simulation of agglomeration reactors via a coupled CFD/direct Monte-Carlo method
    Chemical Engineering Science, 2001
    Co-Authors: Laurent Madec, Laurent Falk, Edouard Plasari
    Abstract:

    The present study deals with simulation of agglomeration reactors, based on a CFD calculation method for describing the turbulent flow field, coupled with a direct Monte-Carlo method for the agglomeration process. The potentiality of stochastic methods, well suited for simulation of spherical agglomeration where complex kernels have to take into account the effects of the particles size and of the composition of binding agent, is illustrated. Furthermore, it is shown that the coupling between hydrodynamics and kinetics makes it possible to model very complex processes, and also to scale-up those processes from batch to continuous mode operation. Application and results are presented for the complex case of agglomeration in suspension of an organic pigment, performed in a standard stirred vessel equipped with a pitched Blade Turbine.

František Rieger - One of the best experts on this subject based on the ideXlab platform.

  • Mixing of waste gypsum suspensions
    2016
    Co-Authors: Tomáš Jirout, František Rieger
    Abstract:

    The paper deals with experimental research of the waste suspensions mixing from the energy industry. Mixing experiments were carried out in a transparent baffled vessel with a diameter of 290 mm. Standard pitched six-Blade Turbine and folded four-Blade Turbine with diameters of 100 mm in two relative distances from bottom H2/d = 1 and 0.5 were used in experiments. Measurements were carried out with three volumetric concentrations of suspensions: 16, 31.5 and 47%.

  • EFFECT OF IMPELLER SHAPE ON SOLID PARTICLE SUSPENSION
    Chemical and Process Engineering, 2013
    Co-Authors: František Rieger, Tomáš Jirout, Dorin Ceres, Pavel Seichter
    Abstract:

    This paper deals with the effect of impeller shape on off-bottom particle suspension. On the basis of numerous suspension measurements, correlations are proposed for calculating the just-suspended impeller speed for a standard pitched four-Blade Turbine and three types of hydrofoil impellers produced by TECHMIX for several particle sizes and for a wide range of particle concentrations. The suspension efficiency of the tested impellers is compared with the efficiency of a standard pitched Blade Turbine on the basis of the power consumption required for off-bottom suspension of solid particles. It is shown that the standard pitched Blade Turbine needs highest power consumption, i.e. it exhibits less efficiency for particle suspension than hydrofoil impellers produced by TECHMIX.

  • Pitched Blade Turbine Efficiency at Particle Suspension
    2010
    Co-Authors: D. Ceres, T. Jirout, František Rieger
    Abstract:

    Mixing suspensions is a very important hydraulic operation. The pitched six-Blade Turbine is a widely-used axial-flow impeller. This paper deals with effect relative impeller size and particle content on theefficiency of a pitched six-Blade Turbine at particle suspension. Two pitched six-Blade Turbines were used in model measurements of just suspension impeller speed. The ratios of the vessel to agitator diameter D/d were 3 and 4.5. The measurements were carried out in a dish-bottomed vessel 300 mm in diameter. The just suspension impeller speeds were measured using an electrochemical method, and were checked visually. A 2.5 % NaCl water solution was used as the liquid phase, and glass particles with four equivalent diameters between 0.18 and 0.89 mmand volumetric concentration from 2.5 % to 40% were usedasthesolid phase. The criterion values π s =P o √Fr' 3 (d/D) 7 were calculated from the particle suspension and power consumption measurements. The dependencies of π s on particle content c v show that larger agitators are more efficient for higher particle content.

  • effect of particle content on agitator speed for off bottom suspension
    Chemical Engineering and Processing, 2002
    Co-Authors: František Rieger
    Abstract:

    This paper deals with the effect of particle content on agitator speed for off-bottom suspension. The measurements were carried out with a pitched six-Blade Turbine characterized by agitator to vessel diameter ratio d/D=0.3 in dish bottomed vessel equipped with four baffles. The resulting equation for off-bottom suspension was obtained in a wide range of particle sizes for volumetric particle content up to 20%.

  • effect of particle content on agitator speed for off bottom suspension
    Chemical Engineering Journal, 2000
    Co-Authors: František Rieger
    Abstract:

    This paper deals with the effect of particle content on agitator speed for off-bottom suspension. The measurements were carried out with a pitched six-Blade Turbine in a flat-bottomed vessel equipped with four baffles. An equation for off-bottom suspension speed was obtained for volumetric particle content up to 45%.

Carlos Baqueiro - One of the best experts on this subject based on the ideXlab platform.

  • Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel
    Chemical Engineering Research and Design, 2018
    Co-Authors: Carlos Baqueiro, Nelson Ibaseta, Pierrette Guichardon, Laurent Falk
    Abstract:

    This work studies how deeply the reagents choice influences micromixing characterisation by the Villermaux-Dushman method, when applying it to a 1 litre stainless steel standard vessel with two baffles, stirred by an inclined Blade Turbine. For the first time, borate and phosphate buffer are compared on their use in the method. It is observed that triiodide production is higher when borate buffer is used. Moreover, perchloric acid leads to higher triiodide production than sulphuric acid, when injecting the same concentration of both acids. Finally, the influence of the ionic strength is also studied, since there has been a great deal of controversy about it over the last years. The results show that the ionic strength affects triiodide production, although relatively slightly. Advice concerning the choice of the reagents is given in conclusion.

Pierrette Guichardon - One of the best experts on this subject based on the ideXlab platform.

  • Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel
    Chemical Engineering Research and Design, 2018
    Co-Authors: Carlos Baqueiro, Nelson Ibaseta, Pierrette Guichardon, Laurent Falk
    Abstract:

    This work studies how deeply the reagents choice influences micromixing characterisation by the Villermaux-Dushman method, when applying it to a 1 litre stainless steel standard vessel with two baffles, stirred by an inclined Blade Turbine. For the first time, borate and phosphate buffer are compared on their use in the method. It is observed that triiodide production is higher when borate buffer is used. Moreover, perchloric acid leads to higher triiodide production than sulphuric acid, when injecting the same concentration of both acids. Finally, the influence of the ionic strength is also studied, since there has been a great deal of controversy about it over the last years. The results show that the ionic strength affects triiodide production, although relatively slightly. Advice concerning the choice of the reagents is given in conclusion.

Nelson Ibaseta - One of the best experts on this subject based on the ideXlab platform.

  • Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel
    Chemical Engineering Research and Design, 2018
    Co-Authors: Carlos Baqueiro, Nelson Ibaseta, Pierrette Guichardon, Laurent Falk
    Abstract:

    This work studies how deeply the reagents choice influences micromixing characterisation by the Villermaux-Dushman method, when applying it to a 1 litre stainless steel standard vessel with two baffles, stirred by an inclined Blade Turbine. For the first time, borate and phosphate buffer are compared on their use in the method. It is observed that triiodide production is higher when borate buffer is used. Moreover, perchloric acid leads to higher triiodide production than sulphuric acid, when injecting the same concentration of both acids. Finally, the influence of the ionic strength is also studied, since there has been a great deal of controversy about it over the last years. The results show that the ionic strength affects triiodide production, although relatively slightly. Advice concerning the choice of the reagents is given in conclusion.