Showing papers in "Chemical Engineering Science in 2005"

TL;DR: A review on microstructured mixer devices and their mixing principles concerning miscible liquids (and gases) is given in this article, supplemented by the description of typical mixing element designs, methods for mixing characterisation, and application fields.

TL;DR: The use of segmented flow in capillaries, also known as Taylor flow, for reaction engineering purposes has soared in recent years as mentioned in this paper, with an emphasis on the underlying principles.

TL;DR: In this paper, the hydrodynamics of a two-dimensional gas-solid fluidized bed reactor were studied experimentally and computationally using simulation results from a commercial CFD software package, Fluent.

TL;DR: In this paper, different structured activated carbons were prepared from Terminalia arjuna nuts, an agricultural waste, by chemical activation with zinc chloride for the adsorption of Cr(VI) from dilute aqueous solutions.

TL;DR: In this paper, a 3D volume of fluid (VOF) model is presented featuring an interface reconstruction technique based on piecewise linear interface representation, which can handle a large density and viscosity ratio and a large value of surface tension coefficient.

TL;DR: In this article, the design and retrofit problem of a supply chain (SC) consisting of several production plants, warehouses and markets, and the associated distribution systems, is considered, where the problem objective is assessed by taking into account not only the profit over the time horizon, but also the resulting demand satisfaction.

TL;DR: In this paper, a new method for targeting the minimum freshwater and pinch in a single-contaminant water network is proposed, which can be applied to both kinds of operations.

TL;DR: In this article, two-dimensional axisymmetric Eulerian/Eulerian simulations of two-phase transient flow were performed using a multiphase flow algorithm based on the finite-volume method.

TL;DR: In this article, a small amount of surfactant (0.02 -3 ǫ% sodium dodecyl sulfate, SDS) was added to water to promote hydrate formation.

TL;DR: Two new statistics which represent the contribution of each variable to the monitoring statistics, Hotelling's T 2 and squared prediction error of kernel PCA, respectively are defined.

TL;DR: In this paper, the Ergun equation has been used to predict single-phase pressure drop in a packed bed of arbitrary shaped particles to within ± 10 % on average on average.

TL;DR: In this article, a combined experimental and simulation study on the various regimes, which can be encountered during spout-fluid bed operation, is presented. But the simulation results do not capture the effect of the drag closure on the model results and the influence of the computational grid was studied.

TL;DR: In this paper, the authors discuss some of the techniques which could be implemented in a continuous granulation process of pharmaceuticals and discuss the advantages of such a process over batch-wise processes.

TL;DR: The enhancement effect of using TiO2TiO2 immobilized on activated carbon filter for removing indoor air pollutant at parts-per-billion (ppb) levels has been previously reported as mentioned in this paper.

TL;DR: In this paper, the authors studied the yield strength of paraffin-oil gels formed under various shear and thermal histories and found that the gel was formed under quiescent (shut-in) conditions, and the yield stress decreased with an increasing cooling rate.

TL;DR: In this paper, the state of the art in the modeling of granular flows in mixing processes is discussed, and a quick review of both continuum and discrete-based models is presented, and the focus is then put on the discrete element method (DEM) which has recently proven worthy of interest for the mixing of granularity materials.

TL;DR: In this article, the reaction kinetics of the absorption of CO2 into aqueous solutions of piperazine (PZ) and into mixed amine solutions of 2-amino-2-methyl-l-propanol (AMP) and PZ were investigated by wetted wall column at 30-40°C.

TL;DR: In this article, the deformation and breakage behavior of granulates in single particle compression test were described by means of forcedisplacement curves, by application of Hertz-Huber contact theory and continuum mechanics.

TL;DR: In this article, a numerical modeling method is presented for gas-liquid flow in mechanically stirred tanks, where the tank is represented by a mesh which explicitly includes the impeller geometry, with impeller motion treated by the multiple frames of reference or sliding mesh methods.

TL;DR: In this paper, two closure models, one semi-empirical model assuming a constant viscosity of the solid phase (CVM) and a second model based on the kinetic theory of granular flow (KTGF), have been compared in this part in their performance to describe bubble formation at a single orifice and the time-averaged porosity profiles in the bed using experimental data obtained for a pseudo two-dimensional fluidized bed operated with a jet in the center.

TL;DR: In this article, the liquid-phase volumetric mass transfer coefficient k L a was obtained from experimental oxygen absorption dynamics, with the additional assumption that the dominant mass transfer contribution is to the film surrounding the bubble.

TL;DR: In this paper, the effect of various geometrical parameters of a grooved staggered herringbone micromixer on the mixing performance has been investigated using computational fluid dynamics, and the results show that the number of grooves per mixing cycle does not affect the mixing quality in an important way.

TL;DR: In this paper, the glass transition concept is used to estimate the viscosity and Young's modulus for a given amorphous substance while knowing their glass transition temperature in dependence on the water content.

TL;DR: In this article, a non-linear model for the elastic-frictional contact of spherical particles based on a modification of the classical Hertz-Mindlin no-slip solution is proposed.

TL;DR: In this article, the Pt/TiO2 nanoparticles were made by a one-step flame spray pyrolysis (FSP) process that resulted in mostly anatase (69-85 wt%) powders with controlled specific surface area and crystallite size.

TL;DR: This paper presents a new, simpler, more efficient, and potentially tighter, mixed integer linear programming (MILP) formulation using a continuous-time representation with synchronous slots and a novel idea of several balances (time, mass, resource, etc).

TL;DR: In this article, a piezoelectrically actuated sample injector releases approximately 100 ml of tracer liquid into a microchannel of rectangular cross section, and the spreading of the tracer pulse in pressure-driven microflows is monitored with fluorescence microscopy measurements.

TL;DR: In this article, the effect of liquid properties on the performance of bubble column reactors with fine pore spargers was studied. But the authors focused on the effect on the average gas holdup values, bubble size distributions and Sauter diameters and were consistent with existing physical models on coalescence/breakage.

TL;DR: In this paper, computer-automated radioactive particle tracking (CARPT), computed tomography (CT) and computational fluid dynamic (CFD) based models were used to investigate gas-liquid flow generated by a Rushton turbine.

TL;DR: In this article, a particle reaction model including mass and heat transfer has been developed to know the temperature variations produced inside the oxygen carrier particles during the cyclic reduction and oxidation reactions taking place in a chemical-looping combustion (CLC) system.