AICHE Journal

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Conversion of propylene and butylene over ZSM‐5 catalyst
AICHE Journal - Tập 32 Số 9 - Trang 1526-1531 - 1986
S.A. Tabak, Frederick J. Krambeck, William E. Garwood
AbstractUsing the zeolite ZSM‐5, new technology has been developed for catalytically oligomerizing light olefins (C3 to C4) to gasoline (C5 to C10) and diesel (C10 to C20) range product. This reaction produces product constrained by both the...
Comparative analysis of subgrid drag modifications for dense gas‐particle flows in bubbling fluidized beds
AICHE Journal - Tập 59 Số 11 - Trang 4077-4099 - 2013
Simon Schneiderbauer, Stefan Puttinger, Stefan Pirker
Many subgrid drag modifications have been put forth to account for the effect of small unresolved scales on the resolved mesoscales in dense gas‐particle flows. These subgrid drag modifications significantly differ in terms of their dependencies on the void fraction and the particle slip velocity. We, therefore, compare the hydrodynamics of a three‐dimensional bubbling fluidized bed comput...... hiện toàn bộ
Helical flows and chaotic mixing in curved micro channels
AICHE Journal - Tập 50 Số 9 - Trang 2297-2305 - 2004
Fengjian Jiang, Klaus Stefan Drese, Steffen Hardt, M. Küpper, F. Schönfeld
AbstractThe mixing due to helical flows in curved micro channels is investigated. A new chaotic mixing mechanism is presented relying on alternately switching between different flow patterns exhibiting four Dean vortices. Flow patterns and interfacial stretching factors are numerically computed for various Dean numbers. For experimental studies a prototype of a cha...... hiện toàn bộ
Dispersion coefficient for laminar flow in curved tubes
AICHE Journal - Tập 34 Số 12 - Trang 2052-2058 - 1988
P. Daskopoulos, Abraham M. Lenhoff
AbstractThe axial dispersion coefficient in a fluid in laminar flow in a tube is generally smaller in a curved tube than in a straight tube, because of the enhacement of lateral transport by secondary flows. In this paper the extent of this reduction is computed using Horn's modification of Aris's method of moments. Dimensional analysis suggests that the most conve...... hiện toàn bộ
Coiled configuration for flow inversion and its effect on residence time distribution
AICHE Journal - Tập 30 Số 3 - Trang 363-368 - 1984
A. Saxena, K.D.P. Nigam
AbstractFlatter velocity profiles and more uniform thermal environents are extremely desirous factors for improved performance in flow reactors and heat exchangers. One means of achieving this in laminar flow systems is to use mixers and flow inverters. These improve performance but at higher initial and operating costs. This paper introduces a new and more effecti...... hiện toàn bộ
Simulation of helical flows in microchannels
AICHE Journal - Tập 50 Số 4 - Trang 771-778 - 2004
Friedhelm Schönfeld, Steffen Hardt
AbstractHelical flows are investigated in structured microchannels with regard to micromixing by means of computational fluid dynamics (CFD). In the case of bas‐relief structured channels the numerical results are found to be in good agreement with experimental findings. The magnitude of the transverse flow is computed for various Reynolds numbers and for different...... hiện toàn bộ
Numerical study of scalar mixing in curved channels at low Reynolds numbers
AICHE Journal - Tập 50 Số 10 - Trang 2359-2368 - 2004
S. P. Vanka, Guanghua Luo, Chad Winkler
AbstractA computational study has been performed to determine the rates of mixing in a curved square duct at low Reynolds numbers of interest to microfluidic applications. Two flow streams with inlet scalar concentrations of zero and unity in the two halves of a duct perpendicular to the plane of curvature were allowed to mix by convection and diffusion. Concentrat...... hiện toàn bộ
Pure H2 production through hollow fiber hydrogen‐selective MFI zeolite membranes using steam as sweep gas
AICHE Journal - Tập 61 Số 10 - Trang 3459-3469 - 2015
Yuting Zhang, Qi Sun, Xuehong Gu
Hollow fiber MFI zeolite membranes were modified by catalytic cracking deposition of methyldiethoxysilane to enhance their H2/CO2 separation performance and further used in high temperature water gas shift membrane reactor. Steam was used as the sweep gas in the MR for the production of pure H2. Extensive investigations were co...... hiện toàn bộ
Defect‐free palladium membranes on porous stainless‐steel support
AICHE Journal - Tập 44 Số 2 - Trang 310-322 - 1998
Peter Mardilovich, Ying She, Yi Hua, Min‐Hon Rei
AbstractDefect‐free Pd membranes were prepared by an electroless plating technique on porous stainless‐steel tubes. The effective surface of Pd membranes was up to 75 cm2. The helium flux was not detected at room temperature and pressure difference of 3 atm. At 350°C hydrogen permeances of up to \documentclass{article}\page...... hiện toàn bộ
Gas separation by permeators with high‐flux asymmetric membranes
AICHE Journal - Tập 29 Số 4 - Trang 545-552 - 1983
Chuen Y. Pan
AbstractThe permeation behavior of the high‐flux asymmetric membrane differs from that of the conventional symmetric membrane. A calculation method for predicting the gas separation performance of a permeator with asymmetric membrane is presented. The model takes into account the permeate pressure drop and is applicable to both hollow‐fiber and spiral‐wound modules...... hiện toàn bộ
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