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The flow field generated by a rotating impeller is characterized by velocity variations with different spatial and temporal scales: (i) large scales, associated with impeller rotation and non-periodic fluctuations with episodic, bursting... more
The flow field generated by a rotating impeller is characterized by velocity variations with different spatial and temporal scales: (i) large scales, associated with impeller rotation and non-periodic fluctuations with episodic, bursting events often identified as macro-instabilities; (ii) small scales associated with turbulence. Flow motions associated with these different scales contribute to energy transfer, dissipation and also to mixing of species and to dispersion of suspended particles. In this work we propose a methodology based on the concept of coherent flow structures to characterize the flow field in a stirred vessel. Our final aim is to identify the role of large scale flow structures in particle dispersion/resuspension dynamics. To these aims we performed a Direct Numerical Simulation to obtain the turbulent flow field generated by an eight-blade paddle impeller placed mid-way between the top and the bottom of the tank, rotating at 100 rpm. A Lagrangian tracking approa...
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Research Interests:
Micro-satellites (from 10 kg up to 100 kg) have mass, volume, and electrical power constraints due to their low dimensions. These limitations lead to the lack in currently available active orbit control systems in micro-satellites.... more
Micro-satellites (from 10 kg up to 100 kg) have mass, volume, and electrical power constraints due to their low dimensions. These limitations lead to the lack in currently available active orbit control systems in micro-satellites. Therefore, a micro-propulsion system with a high thrust to mass ratio is required to increase the potential functionality of small satellites. Mechatronic is presently working on a liquid bipropellant micro-rocket engine under contract with ESA (Contract No.16914/NL/Sfe - Microturbomachinery Based Bipropellant System Using MNT). The advances in Mechatronic's project are to realise a micro-rocket engine with propellants pressurised by micro-pumps. The energy for driving the pumps would be extracted from a micro-turbine. Cooling channels around the nozzle would be also used in order to maintain the wall material below its maximum operating temperature. A mass budget comparison with more traditional pressure-fed micro-rockets shows a real benefit from this system in terms of mass reduction. In the paper, an overview of the project status in Mechatronic is presented.
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Research Interests: Engineering, Fluid Dynamics, Numerical Simulation, Computer Simulation, Scaling up, and 9 moreHydrodynamics, CHEMICAL SCIENCES, Time Dependent, Operant Conditioning, Three Dimensional, Continuous stirred tank reactor, Numerical computation, Extrapolation, and Industrial Chemistry/Chemical Engineering
Mixing in stirred tank reactors is achieved by the complex interaction between impeller-generated vortical structures and dispersed species. Experiments and numerical simulations have shown the relevance for mixing of the top-bottom... more
Mixing in stirred tank reactors is achieved by the complex interaction between impeller-generated vortical structures and dispersed species. Experiments and numerical simulations have shown the relevance for mixing of the top-bottom circulation loops, of the top counter-rotating vortex and of the trailing vortices. The object of this work is: i) to reproduce numerically a previous experiment (Yianneskis et al., 1987, JFM), ii) to identify and characterize the coherent mixing structures, iii) to examine the Lagrangian dispersion of particles. We computed the three-dimensional, time dependent flow field of a flat-bottom, open-top, baffled-reactor equipped with a six blade Rushton impeller with a finite-volume numerical simulation including a k-ɛ model to simulate the effects of turbulence. We used a Lagrangian tracking with stochastic forcing tuned onto the local turbulence intensities to simulate turbulent dispersion. Preliminary results show that the top-bottom circulation generated by the discharge jet is responsible for the advection of particles in the tank. The top counter-rotating vortex developing from the free surface is responsible for a larger particle dispersion in the upper part of the tank.
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... Marina Campolo. Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Centro Interdipartimentale di Fluidodinamica e Idraulica, Università di Udine, 33100 Udine, Italy. Alfredo Soldati*. Centro ...
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Research Interests:
In this work, we analyzed pollution in the river Arno using a non-steady advection-dispersion-reaction equation (ADRE) calibrated on experimental data. We examined the influence different pollution control strategies have on dissolved... more
In this work, we analyzed pollution in the river Arno using a non-steady advection-dispersion-reaction equation (ADRE) calibrated on experimental data. We examined the influence different pollution control strategies have on dissolved oxygen (DO). We considered (i) flow rate variation; (ii) local oxygenation at critical points; (iii) dynamic modification of wastewater load. Results indicate first, that reservoir management is effective in
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Finite-volume numerical simulations of the #ow "eld in a curved-bottom, free-surface reactor are presented. Full transient simulations with explicit modeling of the air}water interface are made in order to reproduce correctly the... more
Finite-volume numerical simulations of the #ow "eld in a curved-bottom, free-surface reactor are presented. Full transient simulations with explicit modeling of the air}water interface are made in order to reproduce correctly the entire#ow "eld in the vessel. Qualitative comparison of numerical results is given against literature and experimental data. We discuss critically the measurements of the extent of transient duration
Research Interests: Mechanical Engineering, Chemical Engineering, Numerical Analysis, Numerical Simulation, Working Conditions, and 11 moreDynamic Simulation, Turbulent Flow, Interface, Free Surface, Chemical reactors, Finite Volume, Time Dependent, Kinetic Energy, Chemical Engineering Science, Experimental Data, and Cfd
ABSTRACT
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WATER RESOURCES RESEARCH, VOL. 35, NO. 11, PAGES 3547-3552, NOVEMBER 1995 Forecasting river flow rate during low-flow periods using neural networks Marina Campólo, Alfredo Soldati,1 and Paolo Andreussi2 Centro Interdipartimentale ...
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Mixing in stirred tank reactors is achieved by the complex interaction between impeller-generated vortical structures and dispersed species. Experiments and numerical simulations have shown the relevance for mixing of the top-bottom... more
Mixing in stirred tank reactors is achieved by the complex interaction between impeller-generated vortical structures and dispersed species. Experiments and numerical simulations have shown the relevance for mixing of the top-bottom circulation loops, of the top counter-rotating vortex and of the trailing vortices. The object of this work is: i) to reproduce numerically a previous experiment (Yianneskis et al., 1987, JFM), ii) to identify and characterize the coherent mixing structures, iii) to examine the Lagrangian dispersion of particles. We computed the three-dimensional, time dependent flow field of a flat-bottom, open-top, baffled-reactor equipped with a six blade Rushton impeller with a finite-volume numerical simulation including a k-ε model to simulate the effects of turbulence. We used a Lagrangian tracking with stochastic forcing tuned onto the local turbulence intensities to simulate turbulent dispersion. Preliminary results show that the top-bottom circulation generated...
Research Interests:
Research Interests:
Research Interests:
Research Interests: Engineering, Fluid Dynamics, Numerical Simulation, Computer Simulation, Scaling up, and 9 moreHydrodynamics, CHEMICAL SCIENCES, Time Dependent, Operant Conditioning, Three Dimensional, Continuous stirred tank reactor, Numerical computation, Extrapolation, and Industrial Chemistry/Chemical Engineering
Research Interests: Engineering, Performance, Fluid Dynamics, Numerical Simulation, Power Consumption, and 9 moreHydrodynamics, CHEMICAL SCIENCES, Experimental Evaluation, Time Dependent, Operant Conditioning, Three Dimensional, Continuous stirred tank reactor, Reynolds Number, and Industrial Chemistry/Chemical Engineering
... Marina Campolo. Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Centro Interdipartimentale di Fluidodinamica e Idraulica, Università di Udine, 33100 Udine, Italy. Alfredo Soldati*. Centro ...
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Research Interests: Environmental Engineering, Civil Engineering, Prediction, Performance, Regulation, and 15 moreNeural Networks, Temporal Resolution, Time series analysis, Flood Forecasting, Early Warning, Models, Early Warning System, Rainfall, Real Time, Economic Loss, Water Level, Flow Rate, Model Complexity, Artificial Neural Network, and River Discharge
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Research Interests:
Research Interests: Mechanical Engineering, Chemical Engineering, Direct Numerical Simulation, DNS, Immersed Boundary Methods, and 9 moreStirred Tank Reactor, Turbulent Flow, Reference Frame, Second Order, Chemical Engineering Science, Energy Dissipation Rate, Turbulent Kinetic Energy, Momentum Transfer, and Finite Difference Scheme
Research Interests: Mechanical Engineering, Chemical Engineering, Numerical Analysis, Numerical Simulation, Working Conditions, and 11 moreDynamic Simulation, Turbulent Flow, Interface, Free Surface, Chemical reactors, Finite Volume, Time Dependent, Kinetic Energy, Chemical Engineering Science, Experimental Data, and Cfd
Research Interests: Mechanical Engineering, Chemical Engineering, Design, Kinetics, Modeling, and 13 moreNetwork Analysis, Fluid Dynamics, Conception, Numerical Simulation, Thermal Environment, Hydrodynamics, High Temperature, Electric arc furnace, Reactor, Chemical Engineering Science, Residence Time, Experimental Analysis, and Slag
Research Interests: Mechanical Engineering, Chemical Engineering, Design, Fluid Mechanics, Modeling, and 16 morePrediction, Nanoparticle, Filtration, Mathematical Modelling, Lubrication, Conception, Permeability, Diesel engine, Filter Design, Particle, Analytical Model, Three Dimensional, Chemical Engineering Science, Transport Equation, Particle Deposition, and Diesel particulate filter
We present an original numerical approach developed to investigate multiphase reacting turbulent flows by discussing an example application in which the injection performance of a new carbon particle injection system for siderurgic... more
We present an original numerical approach developed to investigate multiphase reacting turbulent flows by discussing an example application in which the injection performance of a new carbon particle injection system for siderurgic applications (More srl®) is to be evaluated. Factors ...