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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Modelling And Simulation Of Deep-Bed Grain Dryers, Johnner P. Sitompul, Istadi Istadi, I Nyoman Widiasa
Modelling And Simulation Of Deep-Bed Grain Dryers, Johnner P. Sitompul, Istadi Istadi, I Nyoman Widiasa
Istadi
This paper concerns with heterogeneous modeling of deepbed grain dryers based on two-phase model by taking into account coupled heat and mass transfer within grains. This model also consider axial mass and heat dispersion in the fluid phase. The dynamictwo-phase equations are solved numerically by finite difference with alternating direction implicit method algorithm, and then applied to simulate humidity and temperature profile of drying gas across dryers together with moisture content and temperature of grains. The capabilities of these models were compared with experimental data obtained from available literatures, under drying conditions such as temperature and absolute humidity of drying …
Exposición A Fluoruros Del Agua Potable En La Ciudad De Aguascalientes, México, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
Exposición A Fluoruros Del Agua Potable En La Ciudad De Aguascalientes, México, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
Adrian Bonilla-Petriciolet
Objetivos. Determinar el contenido de fluoruros en todos los pozos de suministro de agua potable de la ciudad de Aguascalientes para establecer el grado de exposición de la población. Métodos. Se determinó el contenido de fluoruros de los 126 pozos de suministro de agua potable de la ciudad de Aguascalientes, México, con el método SPADNS, conforme a las normativas mexicanas NMX-AA-77-1982 y NMX-014-SSAI-1993. Con los datos obtenidos se crearon mapas de isolíneas de concentración que muestran la distribución de esta variable en los mantos freáticos que abastecen a la ciudad de Aguascalientes y se estimaron las dosis de exposición de …
Two-Phase Partitioning Bioreactors In Fermentation Technology, Janusz J. Malinowski
Two-Phase Partitioning Bioreactors In Fermentation Technology, Janusz J. Malinowski
Janusz J. Malinowski
The two-phase partitioning bioreactor concept appears to have a great potential in enhancing the productivity of many bioprocesses. The proper selection of an organic solvent is the key to successful application of this approach in industrial practice. The integration of fermentation and a primary product separation step has a positive impact on the productivity of many fermentation processes. The controlled substrate delivery from the organic to the aqueous phase opens a new area of application of this strategy to biodegradation of xenobiotics. In this review, the most recent advances in the application of two-liquid phase partitioning bioreactors for product or …
Structure Of Alkanoic Acid Stabilized Magnetic Fluids. A Small-Angle Neutron And Light Scattering Analysis, Seif-Eddeen K. Fateen
Structure Of Alkanoic Acid Stabilized Magnetic Fluids. A Small-Angle Neutron And Light Scattering Analysis, Seif-Eddeen K. Fateen
Seif-Eddeen K Fateen
No abstract provided.
Simulations Of Non-Stationary Reactors For The Catalytic Conversion Of Methane To Synthesis Gas, Krzysztof Gosiewski
Simulations Of Non-Stationary Reactors For The Catalytic Conversion Of Methane To Synthesis Gas, Krzysztof Gosiewski
Krzysztof Gosiewski
Mathematical simulation results are compared for several types of reactors for the conversion of methane to synthesis gas via catalytic partial oxidation of methane coupled with the simultaneous steam reforming. The simulations concerned reactors operating under non-stationary conditions, i.e. at a continuous, forced unsteady state. Both reverse-flowreactors with pelletized and monolith catalyst were simulated, and those with the pelletized catalyst, operating under conditions of feed composition cycling. The simulation results were compared with data for similar reactors operating at steady state. The basic process parameters compared include the conversion of methane and oxygen and the selectivities of the products (CO …
Characterisation Of Non-Condensable Sulphur Containing Gases From Kraft Pulp Mills (2), João F. Gomes
Characterisation Of Non-Condensable Sulphur Containing Gases From Kraft Pulp Mills (2), João F. Gomes
João F Gomes
This paper describes work performed on the sampling and analysis of non-condensable gases (NCG) emitted from diffuse sources of a Portuguese Kraft pulp mill, which is the background information for a NCG collection, treatment and disposal system. The variability found in the composition of the gaseous compounds showed the existence of gaseous streams other than typical total reduced sulphur (TRS) compounds as usually described. From the measured TRS concentrations and the gas flow rate from each source it was possible to calculate the emission flow rate, E, of each source. These emission flow rates were then divided into 3 categories …
Numerical Simulation Of A Gas–Liquid Flow In A Fixed Bed, Ashok S. Sangani, Sangkyun Koo
Numerical Simulation Of A Gas–Liquid Flow In A Fixed Bed, Ashok S. Sangani, Sangkyun Koo
Ashok S. Sangani
A countercurrent gas–liquid flow through a fixed bed of spherical particles is examined numerically by solving the particle-scale equations governing the gas and liquid flows. The liquid is assumed to flow along the surface of the particles forming a thin film. The case of small gas flow rates is examined in detail first. In this limit the presence of the liquid film increases the gas pressure drop over its value for a dry bed by three mechanisms: The liquid film makes the apparent size of the particles larger, decreases the pore space for the gas flow, and, with its velocity …
Attenuation Of Sound In Concentrated Suspensions: Theory And Experiments, Ashok S. Sangani, Peter D. M. Spelt, Michael A. Norato, Margaret S. Greenwood, Lawrence L. Tavarides
Attenuation Of Sound In Concentrated Suspensions: Theory And Experiments, Ashok S. Sangani, Peter D. M. Spelt, Michael A. Norato, Margaret S. Greenwood, Lawrence L. Tavarides
Ashok S. Sangani
Ensemble-averaged equations are derived for small-amplitude acoustic wave propagation through non-dilute suspensions. The equations are closed by introducing effective properties of the suspension such as the compressibility, density, viscoelasticity, heat capacity, and conductivity. These effective properties are estimated as a function of frequency, particle volume fraction, and physical properties of the individual phases using a self-consistent, effective-medium approximation. The theory is shown to be in excellent agreement with various rigorous analytical results accounting for multiparticle interactions. The theory is also shown to agree well with the experimental data on concentrated suspensions of small polystyrene particles in water obtained by Allegra …
Measurements Of The Average Properties Of A Suspension Of Bubbles Rising In A Vertical Channel, Ashok S. Sangani, Roberto Zenit, Donald L. Koch
Measurements Of The Average Properties Of A Suspension Of Bubbles Rising In A Vertical Channel, Ashok S. Sangani, Roberto Zenit, Donald L. Koch
Ashok S. Sangani
Experiments were performed in a vertical channel to study the behaviour of a monodisperse bubble suspension for which the dual limit of large Reynolds number and small Weber number was satisfied. Measurements of the liquid-phase velocity fluctuations were obtained with a hot-wire anemometer. The gas volume fraction, bubble velocity, bubble velocity fluctuations and bubble collision rate were measured using a dual impedance probe. Digital image analysis was performed to quantify the small polydispersity of the bubbles as well as the bubble shape.A rapid decrease in bubble velocity with bubble concentration in very dilute suspensions is attributed to the effects of …