Showing papers in "Chemical Engineering Science in 2010"

TL;DR: In this article, a literature review on the mechanisms and models of coalescence of fluid particles is presented, and five categories are summarized, namely, turbulence fluctuation, viscous shear stress, capture in turbulent eddies, buoyancy and wake interaction.

TL;DR: In this article, the basic concepts and theories of charge transfer between solid surfaces are summarized, and chemical factors depending on materials and environmental effects are described, and relevant models are discussed.

TL;DR: In this paper, small bubbles of nitrogen, methane, or argon with an average radius of 50nm, as measured by scanning electron microscopy, were prepared under atmospheric conditions.

TL;DR: In this paper, a detailed comparison of mixing efficiency of different mixers that have been characterized by the Villermaux/Dushman test reaction is presented, and it is shown how to obtain the theoretical mixing time and how to relate it with operating parameters as the Reynolds number of the flow and the specific power dissipation per mass unit of fluid.

TL;DR: In this paper, a post-combustion CO2 capture process based on cryogenic CO2 freeze-out in dynamically operated packed beds is proposed and developed, based on the differences in dew and sublimation points.

TL;DR: The authors analyzes the historical developments of coal liquefaction technologies from science point of view, presents recent developments of the technologies in China, and identifies challenges of coal-liquefaction technology towards successful industrial application.

TL;DR: In this article, the response surface methodology has been performed based on the Muschelknautz method of modeling (MM) to optimize the cyclone geometrical ratios to achieve minimum pressure drop.

TL;DR: In this paper, the potential use of triamine-grafted poreexpanded mesoporous silica TRI-PE-MCM-41 for the removal of CO2 from nitrogen, oxygen and water vapor-containing mixtures was demonstrated.

TL;DR: In this paper, the rate of CO 2 absorption into a falling thin film has been measured using a wetted-wall column for aqueous ammonia between 0.6 and 6.5 times smaller than MEA at the measured temperatures, and it was shown that the difference in mass transfer rate is likely due to both the reduced temperature and differences in reactivity between ammonia and MEA with CO 2.

TL;DR: In this article, a non-destructive NIR spectroscopic method was used to acquire on-line spectra of a continuous mixing process, and evaluate the performance of this novel system.

TL;DR: In this paper, the authors investigated the squeezing-to-dripping transition for bubble formation in a microfluidic T-junction by cross-flowing rupture technique using a high-speed digital camera.

TL;DR: In this article, the effects of packing form and particle shape on the flow and heat transfer inside small pores of some novel structured packed beds are numerically studied, where the packed beds with ellipsoidal or non-uniform spherical particles are investigated for the first time and some new transport phenomena are obtained.

TL;DR: A review of existing methods for the characterisation of mixing and flow in microchannels, micromixers and microreactors can be found in this article, where the authors analyze the current experimental techniques and methods available for characterising mixing and the associated phenomena in single and multiphase flow.

TL;DR: In this paper, the effects of particle collisions on damping fluctuating particle velocities and, in gas/liquid/solid beds, fluctuating temperatures and compositions of liquid films on particle surfaces are investigated.

TL;DR: In this paper, six dialkylimidazolium halide ionic liquids have been investigated for their potential application as novel gas hydrate inhibitors and their effects on the equilibrium hydrate dissociation curve in a pressure range 105-205 bar and the induction time of methane hydrate formation at 114-bar and a high degree of supercooling, i.e., about 25°C, are measured in a high-pressure micro-differential scanning calorimeter.

TL;DR: In this article, multiwalled carbon nanotubes (CNTs) were fabricated and modified by 3-aminopropyl-triethoxysilane (APTS) solutions to study thermodynamics and regeneration of CO2 adsorption from gas streams.

TL;DR: In this paper, a re-formulation of the pressure-gradient force model, based on a modified pressure correction method, coupled to a discrete element model with non-spherical grains is presented.

TL;DR: It is shown that using CUDA and GPUs, the tool is able to simulate granular flows involving several millions of particles significantly faster than using currently available software.

TL;DR: In this paper, a theoretical model for the tortuosity of a fixed bed randomly packed with identical particles has been developed, which is proportional to a packing structure factor ( ( 1 − e ) 4 / 3 / e φ 2 ) which is explicitly given in terms of bed voidage and particles shape factor (sphericity).

TL;DR: In this paper, a fractal capillary model is proposed to analyze the depth of extraneous fluid invasion, where the tortuosity of capillaries and capillary pressure effect are taken into account.

TL;DR: In this article, a volume of fluid method is developed in order to simulate reactive mass transfer in two-phase flows and is applied to study reactive laminar liquid film, where the thermodynamic equilibrium of chemical species at the interface is considered using Henry's law.

TL;DR: In this article, a cubic equation of state (the van der Waals equation) was extended to describe the behavior of pure fluids and mixtures confined in porous solids, and the effect of pore size on fluid properties was explicitly represented in the model, allowing its application to both confined and bulk fluids thus providing a consistent description of adsorption systems for all pore sizes.

TL;DR: In this article, a new hybrid material, NiO-CaO−Ca 12 Al 14 O 33, which functions simultaneously as reforming catalyst and CO 2 sorbent for application in sorption enhanced reforming is presented.

TL;DR: In this paper, the effect of important parameters such as impeller type (Lightnin A100, A200, A310, and A320 impellers), impeller speed (250, 800, and T /5, T/2), particle size (210,1500, and solid concentration (5,30), and off-bottom clearance (T /5 − T /2, where T is the tank diameter) on the degree of homogeneity was explored.

TL;DR: In this article, the effects of the mixture velocity and the homogeneous void fraction on flow and heat transfer were studied using the volume of fluid (VOF) and level set techniques to capture the gas-liquid interface, as implemented in the ANSYS Fluent and TransAT codes, respectively.

TL;DR: In this article, a novel comprehensive numerical study is presented for a better understanding of mass transfer in channel flows with catalytically active walls at moderate temperatures and surface reaction rates, and 18 different numerical models are compared, which represent mass transfer within single channels of a honeycomb-type automotive catalytic converter operated under direct oxidation conditions.

TL;DR: In this article, the solid-state kinetics of Co−Ni/Al 2 O 3 oxygen carrier were studied using non-isothermal reaction data and a non-linear regression analysis.

TL;DR: In this paper, experimental measurements have been carried out to determine the effective diffusion coefficient in the carbon paper gas diffusion layer that is commonly used in PEM fuel cells, and it was found that almost all the existing theoretical models significantly overpredict the diffusion coefficient by as much as 4-5 times; thus, underestimating the transport limitations considerably.

TL;DR: In this article, the authors investigate the transport and transfer properties inside packed beds of spherical particles by means of CFD simulations and show that this treatment has very little influence on the results when analyzed with dimensionless numbers as Nu=f(Re, Pr) or Sh=f (Re, Sc).