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 Fluidized bed (7)
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Articles 1  30 of 43
FullText Articles in Physics
A QuadratureBased Moment Method For Polydisperse Bubbly Flows, Jeffrey C. Heylmun, Bo Kong, Alberto Passalacqua, Rodney O. Fox
A QuadratureBased Moment Method For Polydisperse Bubbly Flows, Jeffrey C. Heylmun, Bo Kong, Alberto Passalacqua, Rodney O. Fox
Chemical and Biological Engineering Publications
A computational algorithm for polydisperse bubbly flow is developed by combining quadraturebased moment methods (QBMM) with an existing twofluid solver for gas–liquid flows. Care is taken to ensure that the twofluid model equations are hyperbolic by generalizing the kinetic model for the bubble phase proposed by Bieseuvel and Gorissen (1990). The kinetic formulation for the bubble phase includes the full suite of interphase momentum exchange terms for bubbly flow, as well as ad hoc bubble–bubble interaction terms to model the transition from isolated bubbles to regions of pure air at very high bubblephase volume fractions. A robust numerical ...
High Throughput, Automated Prediction Of Focusing Patterns For Inertial Microfluidics, Aditya Kommajosula, JeongAh Kim, Wonhee Lee, Baskar Ganapathysubramanian
High Throughput, Automated Prediction Of Focusing Patterns For Inertial Microfluidics, Aditya Kommajosula, JeongAh Kim, Wonhee Lee, Baskar Ganapathysubramanian
Mechanical Engineering Publications
Visual inspections for identifying focusing points in inertial microfluidic flows are prone to misinterpreting stable locations and focusing shifts in the case of nontrivial focusing patterns. We develop and deploy an approach for automating the calculation of focusing patterns for a general channel geometry, and thereby reduce the dependence on empirical/visual procedures to confirm the presence of stable locations. We utilize concepts from interpolation theory (to represent continuous forcefields using discrete points), and stability theory to identify "basins of attraction" and quantitatively identify stable equilibrium points. Our computational experiments reveal that predicting equilibrium points accurately requires upto ×1020 times ...
ShapeDesign For Stabilizing MicroParticles In Inertial Microfluidic Flows, Aditya Kommajosula, Daniel Stoecklein, Dino Di Carlo, Baskar Ganapathysubramanian
ShapeDesign For Stabilizing MicroParticles In Inertial Microfluidic Flows, Aditya Kommajosula, Daniel Stoecklein, Dino Di Carlo, Baskar Ganapathysubramanian
Mechanical Engineering Publications
Design of microparticles which stabilize at the centerline of a channel flow when part of a dilute suspension is examined numerically for moderate Reynolds numbers (10≤Re≤80). Stability metrics for particles with arbitrary shapes are formulated based on linearstability theory. Particle shape is parametrized by a compact, NonUniform Rational BSpline (NURBS)based representation. Shapedesign is posed as an optimization problem and solved using adaptive Bayesian optimization. We focus on designing particles for maximal stability at the channelcenterline robust to perturbations. Our results indicate that centerlinefocusing particles are families of characteristic "fish"/"bottle"/"dumbbell"like shapes, exhibiting foreaft asymmetry. A ...
Effect Of Samarium Doping On The Nucleation Of FccAluminum In Undercooled Liquids, Yang Sun, Feng Zhang, Lin Yang, Zhuo Ye, Huajing Song, Mikhail I. Mendelev, CaiZhuang Wang, KaiMing Ho
Effect Of Samarium Doping On The Nucleation Of FccAluminum In Undercooled Liquids, Yang Sun, Feng Zhang, Lin Yang, Zhuo Ye, Huajing Song, Mikhail I. Mendelev, CaiZhuang Wang, KaiMing Ho
Ames Laboratory Accepted Manuscripts
The effect of Sm doping on the fccAl nucleation was investigated in AlSm liquids with low Sm concentrations (xSm) with molecular dynamics simulations. The nucleation in the moderately undercooled liquid is achieved by the recently developed persistentembryo method. Systematically computing the nucleation rate with different xSm (xSm = 0%, 1%, 2%, 3%, 5%) at 700 K, we found Sm dopant reduces the nucleation rate by up to 25 orders of magnitudes with only 5% doping concentration. This effect is mostly associated with the increase in the free energy barrier with minor contribution from suppression of the attachment to the nucleus caused ...
Theoretical And Experimental Investigation Of Forward Spatter Of Blood From A Gunshot, P. M. Comiskey, A. L. Yarin, Daniel Attinger
Theoretical And Experimental Investigation Of Forward Spatter Of Blood From A Gunshot, P. M. Comiskey, A. L. Yarin, Daniel Attinger
Mechanical Engineering Publications
A theoretical model predicting forward blood spatter patterns resulting from a round nose bullet gunshot wound is proposed. The chaotic disintegration of a blood layer located ahead and aside of the bullet is considered in the framework of percolation theory. The size distribution of blood drops is determined, which allows for the prediction of a blood spatter cloud being ejected from the rear side of the target where the bullet exits. Then, droplet trajectories are numerically predicted accounting for gravity and air drag, which is affected by the collective aerodynamic interaction of drops through air. The model predicts the number ...
A Comparative Study Of Sm Networks In Al10 At.%Sm Glass And Associated Crystalline Phases, Xiaobao Lv, Zhuo Ye, Yang Sun, Feng Zhang, Lin Yang, Zijing Lin, CaiZhuang Wang, KaiMing Ho
A Comparative Study Of Sm Networks In Al10 At.%Sm Glass And Associated Crystalline Phases, Xiaobao Lv, Zhuo Ye, Yang Sun, Feng Zhang, Lin Yang, Zijing Lin, CaiZhuang Wang, KaiMing Ho
Ames Laboratory Accepted Manuscripts
The Al–Sm system is selected as a model system to study the transition process from liquid and amorphous to crystalline states. In recent work, we have shown that, in addition to longrange translational periodicity, crystal structures display welldefined shortrange local atomic packing motifs that transcends liquid, amorphous and crystalline states. In this paper, we investigate the longer range spatial packing of these shortrange motifs by studying the interconnections of Sm–Sm networks in different amorphous and crystalline samples obtained from molecular dynamics simulations. In our analysis, we concentrate on Sm–Sm distances in the range ~5.0–7.2 ...
An OpenSource QuadratureBased Population Balance Solver For Openfoam, Alberto Passalacqua, Frédérique Laurent, Ehsan MadadiKandjani, Jeffrey C. Heylmun, Rodney O. Fox
An OpenSource QuadratureBased Population Balance Solver For Openfoam, Alberto Passalacqua, Frédérique Laurent, Ehsan MadadiKandjani, Jeffrey C. Heylmun, Rodney O. Fox
Chemical and Biological Engineering Publications
The extended quadrature method of moments (EQMOM) for the solution of population balance equations (PBE) is implemented in the opensource computational fluid dynamic (CFD) toolbox OpenFOAM as part of the OpenQBMM project. The moment inversion procedure was designed (Nguyen et al., 2016) to maximize the number of conserved moments in the transported moment set. The algorithm is implemented in a general structure to allow the addition of other kernel density functions defined on R+, and arbitrary kernels to describe physical phenomena involved in the evolution of the number density function. The implementation is verified with a set of zerodimensional cases ...
Structural Signature And Transition Dynamics Of Sb2te3 Melt Upon Fast Cooling, Y. R. Guo, F. Dong, C. Qiao, J. J. Wang, S. Y. Wang, Ming Xu, Y. X. Zheng, R. J. Zhang, L. Y. Chen, CaiZhuang Wang, KaiMing Ho
Structural Signature And Transition Dynamics Of Sb2te3 Melt Upon Fast Cooling, Y. R. Guo, F. Dong, C. Qiao, J. J. Wang, S. Y. Wang, Ming Xu, Y. X. Zheng, R. J. Zhang, L. Y. Chen, CaiZhuang Wang, KaiMing Ho
Ames Laboratory Accepted Manuscripts
Crystalline Sb2Te3 is widely studied due to its important applications in memory materials and topological insulators. The liquid and amorphous structures of this compound as well as the dynamics upon quenching, however, are yet to be fully understood. In this work, we have systematically studied the dynamical properties and local structure of Sb2Te3 at different temperatures using ab initio molecular dynamics simulations. The calculated structure factors agree well with the experimental results. The atomic number density and meansquared displacement as a function of temperature clearly indicate three states as the temperature decreases, namely, melt, undercooled liquid and glass state, respectively ...
Charts Based On Big Data From Fluid Dynamics Simulations Provide A Simple Tool To Estimate How Far From Its Source A Specific Blood Stain Can Be Found, Daniel Attinger
Charts Based On Big Data From Fluid Dynamics Simulations Provide A Simple Tool To Estimate How Far From Its Source A Specific Blood Stain Can Be Found, Daniel Attinger
Mechanical Engineering Publications
The bloodstain pattern analyst sometimes has to judge if a given stain could originate from a specific location. A wide range of values of the maximum distance that a blood drop can travel have been reported from experiments, ranging from less than one meter to more than 10 meter. Here we formulate the problem in a fluid dynamics and big data framework. The fluid dynamics is solved with Newton’s classical equation of motion coupled with well‐established models for the gravity and drag forces that bend the trajectories of drops. The parameters screened are the drop size, initial velocity ...
Nmr Study Of The New Magnetic Superconductor Cak ( Fe 0.951 Ni 0.049 ) 4 As 4 : Microscopic Coexistence Of The Hedgehog SpinVortex Crystal And Superconductivity, QingPing Ding, William R. Meier, A. E. Böhmer, S. L. Bud’Ko, Paul C. Canfield, Yuji Furukawa
Nmr Study Of The New Magnetic Superconductor Cak ( Fe 0.951 Ni 0.049 ) 4 As 4 : Microscopic Coexistence Of The Hedgehog SpinVortex Crystal And Superconductivity, QingPing Ding, William R. Meier, A. E. Böhmer, S. L. Bud’Ko, Paul C. Canfield, Yuji Furukawa
Ames Laboratory Accepted Manuscripts
The coexistence of a newtype antiferromagnetic (AFM) state, the socalled hedgehog spinvortex crystal (SVC), and superconductivity (SC) is evidenced by an 75 As nuclear magnetic resonance study on singlecrystalline CaK ( Fe 0.951 Ni 0.049 ) 4 As 4 . The hedgehog SVC order is clearly demonstrated by the direct observation of internal magnetic induction along the c axis at the As1 site (close to K) and a zero net internal magnetic induction at the As2 site (close to Ca) below an AFM ordering temperature T N ∼ 52 K. The nuclear spinlattice relaxation rate 1 / T 1 shows a distinct decrease ...
Hydrodynamics Of Back Spatter By Blunt Bullet Gunshot With A Link To Bloodstain Pattern Analysis, P. M. Comiskey, A. L. Yarin, Daniel Attinger
Hydrodynamics Of Back Spatter By Blunt Bullet Gunshot With A Link To Bloodstain Pattern Analysis, P. M. Comiskey, A. L. Yarin, Daniel Attinger
Mechanical Engineering Publications
A theoretical model describing the blood spatter pattern resulting from a blunt bullet gunshot is proposed. The predictions are compared to experimental data acquired in the present work. This hydrodynamic problem belongs to the class of the impact hydrodynamics with the pressure impulse generating the blood flow. At the free surface, the latter is directed outwards and accelerated toward the surrounding air. As a result, the RayleighTaylor instability of the flow of blood occurs, which is responsible for the formation of blood drops of different sizes and initial velocities. Thus, the initial diameter, velocity, and acceleration of the atomized blood ...
Application Of The FokkerPlanck Molecular Mixing Model To Turbulent Scalar Mixing Using Moment Methods, Ehsan MadadiKandjani, Rodney O. Fox, Alberto Passalacqua
Application Of The FokkerPlanck Molecular Mixing Model To Turbulent Scalar Mixing Using Moment Methods, Ehsan MadadiKandjani, Rodney O. Fox, Alberto Passalacqua
Chemical and Biological Engineering Publications
An extended quadrature method of moments using the beta kernel density function (betaEQMOM) is used to approximate solutions to the evolution equation for univariate and bivariate composition probability distribution functions (PDFs) of a passive scalar for binary and ternary mixing. The key element of interest is the molecular mixing term, which is described using the FokkerPlanck (FP) molecular mixing model. The direct numerical simulations (DNSs) of Eswaran and Pope ["Direct numerical simulations of the turbulent mixing of a passive scalar,"Phys. Fluids 31, 506 (1988)] and the amplitude mapping closure (AMC) of Pope ["Mapping closures for turbulent mixing and reaction ...
Characterization Of Chlorella Vulgaris And Chlorella Protothecoides Using MultiPixel Photon Counters In A 3d Focusing Optofluidic System, Jonathan B. Vander Wiel, Jonathan D. Mikulicz, Michael R. Boysen, Niloofer Hashemi, Patrick Kalgren, Levi M. Nauman, Seth J. Baetzold, Gabrielle G. Powell, Qing He, Nicole Nastaran Hashemi
Characterization Of Chlorella Vulgaris And Chlorella Protothecoides Using MultiPixel Photon Counters In A 3d Focusing Optofluidic System, Jonathan B. Vander Wiel, Jonathan D. Mikulicz, Michael R. Boysen, Niloofer Hashemi, Patrick Kalgren, Levi M. Nauman, Seth J. Baetzold, Gabrielle G. Powell, Qing He, Nicole Nastaran Hashemi
Mechanical Engineering Publications
Analysis of microparticle size and fluorescence intensity can be used to classify microparticles. We designed and fabricated an optofluidic system that characterizes microparticles, including fluorescent microparticles and microalgae. A new type of multipixel photon counter (MPPC) was employed to miniaturize the device, lower its power consumption, and make it insensitive to magnetic fields. The system uses a 635 nm laser for excitation of the microparticles' fluorescence. The scattered light from the fluorescent microparticles, as well as Chlorella vulgaris and Chlorella protothecoides, were measured. Additionally, we analyzed the width and height of the measured signals generated as a result of microparticles ...
An Experimental Study On The Characteristics Of WindDriven Surface Water Film Flows By Using A MultiTransducer Ultrasonic PulseEcho Technique, Yang Liu, WenLi Chen, Leonard J. Bond, Hui Hu
An Experimental Study On The Characteristics Of WindDriven Surface Water Film Flows By Using A MultiTransducer Ultrasonic PulseEcho Technique, Yang Liu, WenLi Chen, Leonard J. Bond, Hui Hu
Aerospace Engineering Publications
An experimental study was conducted to investigate the characteristics of surface water film flows driven by boundary layer winds over a test plate in order to elucidate the underlying physics pertinent to dynamic water runback processes over ice accreting surfaces of aircraft wings. A multitransducer ultrasonic pulseecho (MTUPE) technique was developed and applied to achieve nonintrusive measurements of water film thickness as a function of time and space to quantify the transient behaviors of winddriven surface water filmflows. The effects of key controlling parameters, including freestream velocity of the airflow and flow rate of the water film, on the dynamics ...
Solution Of Population Balance Equations In Applications With Fine Particles: Mathematical Modeling And Numerical Schemes, Tan Trung Nguyen, Frédérique Laurent, Rodney O. Fox, Marc Massot
Solution Of Population Balance Equations In Applications With Fine Particles: Mathematical Modeling And Numerical Schemes, Tan Trung Nguyen, Frédérique Laurent, Rodney O. Fox, Marc Massot
Chemical and Biological Engineering Publications
The accurate description and robust simulation, at relatively low cost, of global quantities (e.g. number density or volume fraction) as well as the size distribution of a population of fine particles in a carrier fluid is still a major challenge for many applications. For this purpose, two types of methods are investigated for solving the population balance equation with aggregation, continuous particle size change (growth and size reduction), and nucleation: the extended quadrature method of moments (EQMOM) based on the work of Yuan et al.[52]and a hybrid method (TSM) between the sectional and moment methods, considering two ...
Prediction Of Blood Back Spatter From A Gunshot In Bloodstain Pattern Analysis, P. M. Comiskey, A. L. Yarin, S. Kim, Daniel Attinger
Prediction Of Blood Back Spatter From A Gunshot In Bloodstain Pattern Analysis, P. M. Comiskey, A. L. Yarin, S. Kim, Daniel Attinger
Mechanical Engineering Publications
A theoretical model for predicting and interpreting bloodspatter patterns resulting from a gunshot wound is proposed. The physical process generating a backward spatter of blood is linked to the RayleighTaylor instability of blood accelerated toward the surrounding air, allowing the determination of the initial distribution of drop sizes and velocities. Then the motion of many drops in air is considered with governing equations accounting for gravity and air drag. Based on these equations, a numerical solution is obtained. It predicts the atomization process, the trajectories of the backspatter drops of blood from the wound to the ground, the impact angle ...
Thermodynamics And Historical Relevance Of A Jetting Thermometer Made Of Chinese Zisha Ceramic, Vincent Lee, Daniel Attinger
Thermodynamics And Historical Relevance Of A Jetting Thermometer Made Of Chinese Zisha Ceramic, Vincent Lee, Daniel Attinger
Mechanical Engineering Publications
Following a recent trend of scientific studies on artwork, we study here the thermodynamics of a thermometer made of zisha ceramic, related to the Chinese tea culture. The thermometer represents a boy who “urinates” shortly after hot water is poured onto his head. Long jetting distance is said to indicate that the water temperature is hot enough to brew tea. Here, a thermodynamic model describes the jetting phenomenon of that peepee boy. The study demonstrates how thermal expansion of an interior air pocket causes jetting. A thermodynamic potential is shown to define maximum jetting velocity. Seven optimization criteria to maximize ...
High Fidelity Cfd Modeling Of Natural Ventilation In A Solar House, Mirka Deza, Baskar Ganapathysubramanian, Shan He, Ulrike Passe
High Fidelity Cfd Modeling Of Natural Ventilation In A Solar House, Mirka Deza, Baskar Ganapathysubramanian, Shan He, Ulrike Passe
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Natural ventilation is an important factor in the design of sustainable buildings; it has the potential to improve air quality, while providing thermal comfort at reduced energy costs. Computational fluid dynamics (CFD) simulations provide comprehensive information on the internal flow pattern and can be used as a design tool. The present work offers insight of natural ventilation in a fully functional building, namely, the solar facility Interlock House in Iowa. Ventilation in the house is studied during summer months with some of its furniture included. The results show quantitative agreement between numerical simulations and experiments of vertical temperature profiles for ...
Towards Eulerian Modeling Of A Polydisperse Evaporating Spray Under Realistic InternalCombustionEngine Conditions, Oguz Emre, Rodney O. Fox, Marc Mossot, Stephane De Chaisemartin, Stephane Jay, Frederique Laurent
Towards Eulerian Modeling Of A Polydisperse Evaporating Spray Under Realistic InternalCombustionEngine Conditions, Oguz Emre, Rodney O. Fox, Marc Mossot, Stephane De Chaisemartin, Stephane Jay, Frederique Laurent
Chemical and Biological Engineering Publications
To assist the industrial engine design process, 3D computational fluid dynamics simulations are widely used, bringing a comprehension of the underlying physics unattainable from experiments. However, the multiphase flow description involving a liquid fuel jet injected into the chamber is still in its early stages of development. There is a pressing need for a spray model that is time efficient and accurately describes the cloud of fuel and droplet dynamics downstream of the injector. Eulerian descriptions of the spray are well adapted to this highly unsteady configuration. The challenge is then to capture accurately both the evaporating spray polydispersity and ...
Characterizing Acoustic Fluidized Bed Hydrodynamics Using XRay Computed Tomography, David R. Escudero, Theodore J. Heindel
Characterizing Acoustic Fluidized Bed Hydrodynamics Using XRay Computed Tomography, David R. Escudero, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized bed reactors are important assets of many industrial applications because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Characterizing the hydrodynamics of a fluidized bed is important to better understand the behavior of these multiphase flow systems. The hydrodynamic behavior in a cold flow 3D fluidized bed, with and without acoustic intervention, using Xray computed tomography is investigated in this study. Experiments are carried out in a 10.2 cm ID fluidized bed filled with glass beads, with material density of 2600 kg/m^{3} and particle size ranges between 212–600 μm. In ...
A HighSpeed XRay Detector System For Noninvasive Fluid Flow Measurements, Timothy B. Morgan, Benjamin R. Halls, Terrence R. Meyer, Theodore J. Heindel
A HighSpeed XRay Detector System For Noninvasive Fluid Flow Measurements, Timothy B. Morgan, Benjamin R. Halls, Terrence R. Meyer, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
The opaque nature of many multiphase flows has long posed a significant challenge to the visualization and measurement of desired characteristics. To overcome this difficulty, Xray imaging, both in the form of radiography and computed tomography, has been used successfully to quantify various multiphase flow phenomena. However, the relatively low temporal resolution of typical Xray systems limit their use to moderately slow flows and timeaverage values. This paper discusses the development of an Xray detection system capable of highspeed radiographic imaging that can be used to visualize multiphase flows. Details of the hardware will be given and then applied to ...
Acoustic Field Effects On Minimum Fluidization Velocity In A 3d Fluidized Bed, David R. Escudero, Theodore J. Heindel
Acoustic Field Effects On Minimum Fluidization Velocity In A 3d Fluidized Bed, David R. Escudero, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequency on the minimum fluidization velocity in a 3D fluidized bed are investigated in this study. Experiments are carried out in a 10.2 cm ID cold flow fluidized bed filled with glass beads with material density of 2600 kg/m^{3}, and particles ...
Cavitation From A Butterfly Valve: Comparing 3d Simulations To 3d XRay Computed Tomography Flow Visualization, Graham Brett, Marc Riveland, Terrence C. Jensen, Theodore J. Heindel
Cavitation From A Butterfly Valve: Comparing 3d Simulations To 3d XRay Computed Tomography Flow Visualization, Graham Brett, Marc Riveland, Terrence C. Jensen, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Flow control valves may experience localized cavitation when the local static pressure drops to the liquid vapor pressure. Localized damage to the valve and surrounding area can occur when the vapor cavity collapses. Valve designs that reduce cavitation are based on empirical evidence and accumulated experience, but there are still considerable cavitation problems in industry. Valve designers may use computational fluid dynamics (CFD) to simulate cavitation in flow control valves, but model validation is challenging because there are limited data of local cavitation from the valve surface. Typically, the intensity of cavitation in a control valve is inferred from measurements ...
A Method To Quantify Mixing In A Two Component Fluidized Bed, Norman K. Keller, Theodore J. Heindel
A Method To Quantify Mixing In A Two Component Fluidized Bed, Norman K. Keller, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized bed technology can be used for pyrolysis and gasification of solid fuel particles such as biomass, which is important to industry because of its potential as an alternative for petroleumbased fuels. To efficiently utilize a fluidized bed reactor it is necessary, among other factors, to investigate the mixing and segregation behavior of the fuel particles with the bed material. In order to characterize the material distribution, a technique to visualize the biomass inside a fluidized bed reactor has been developed using Xray computed tomography (CT) scans. This paper presents an image analysis procedure that can be used to quantify ...
XRay Particle Tracking Velocimetry In Fluidized Beds, Joshua B. Drake, Lie Tang, Theodore J. Heindel
XRay Particle Tracking Velocimetry In Fluidized Beds, Joshua B. Drake, Lie Tang, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized beds are commonly found in the chemical and energy processing industries because of their low pressure drop, uniform temperature distribution, and high heat transfer rates. For example, in biomass gasification, biomass particles are injected into a heated bubbling bed of inert material (typically refractory sand) that volatilizes to form a flammable gas. However, the movement of the biomass particle through the bubbling bed is difficult to quantify because the systems are opaque. This paper describes Xray particle tracking velocimetry (XPTV) applied to fluidized beds, where Xray flow visualization is used to track the location of a single fabricated tracer ...
Repeatability Of Gas Holdup In A Fluidized Bed Using XRay Computed Tomography, Joshua B. Drake, Theodore J. Heindel
Repeatability Of Gas Holdup In A Fluidized Bed Using XRay Computed Tomography, Joshua B. Drake, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Characterizing the hydrodynamics in fluidized beds is important to many processes from producing biofuels to coating pharmaceuticals. Xray computed tomography (CT) can quantify local timeaveraged phase fractions in multiphase systems that are highly dynamic, like fluidized beds. This paper describes the calibration methods used to produced CT images of a 15.24 cm diameter fluidized bed, how inhouse software used these CTs to calculate gas holdup, and how well multiple CTs of a dynamic fluidized bed produced repeatable results while varying bed material and superficial gas velocities. It was concluded there is a very high degree of repeatability using the ...
Modeling A Biomass Fluidizing Bed With Side Port Air Injection, Mirka Deza, Francine Battaglia, Theodore J. Heindel
Modeling A Biomass Fluidizing Bed With Side Port Air Injection, Mirka Deza, Francine Battaglia, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized beds are used to gasify materials such as coal or biomass in the production of producer gas. Modeling these reactors using computational fluid dynamics is advantageous when performing parametric studies for design and scaleup. While twodimensional simulations are easier to perform than threedimensional simulations, they may not capture the proper physics. This paper compares two and threedimensional simulations with experiments for a reactor geometry with side port air injection. The side port is located within the bed region so that the injected air can help promote mixing. Of interest in this study is validating the hydrodynamics of fluidizing biomass ...
Approximating A ThreeDimensional Fluidized Bed With TwoDimensional Simulations, Mirka Deza, Francine Battaglia, Theodore J. Heindel
Approximating A ThreeDimensional Fluidized Bed With TwoDimensional Simulations, Mirka Deza, Francine Battaglia, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Fluidized beds can be used to gasify biomass in the production of producer gas, a flammable gas that can replace natural gas in process heating. Modeling these reactors with computational fluid dynamics (CFD) simulations is advantageous when performing parametric studies for design and scaleup. From a computational resource point of view, twodimensional simulations are easier to perform than threedimensional simulations, but they may not capture the proper physics. This paper will compare two and threedimensional simulations in a 10.2 cm diameter fluidized bed with side air injection to determine when twodimensional simulations are adequate to capture the bed hydrodynamics ...
Simulating GasLiquid Flows In An External Loop Airlift Reactor, Deify Law, Francine Battaglia, Theodore J. Heindel
Simulating GasLiquid Flows In An External Loop Airlift Reactor, Deify Law, Francine Battaglia, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
The external loop airlift reactor (ELALR) is a modified bubble column reactor that is composed of two vertical columns that are connected with two horizontal connectors. Airlift reactors are utilized in fermentation processes and are preferred over traditional bubble column reactors because they can operate over a wider range of conditions. Computational fluid dynamics (CFD) simulations can be used to enhance our understanding of the hydrodynamics within these reactors. In the present work, the gasliquid flow dynamics in an external loop airlift reactor are simulated using CFDLib with an EulerianEulerian ensembleaveraging method in twodimensional (2D) and threedimensional (3D) coordinate systems ...
A Validation Study For The Hydrodynamics Of Biomass In A Fluidized Bed, Mirka Deza, Francine Battaglia, Theodore J. Heindel
A Validation Study For The Hydrodynamics Of Biomass In A Fluidized Bed, Mirka Deza, Francine Battaglia, Theodore J. Heindel
Mechanical Engineering Conference Presentations, Papers, and Proceedings
Computational modeling of fluidized beds can be used to predict operation of biomass gasifiers after extensive validation with experimental data. The present work focused on computational simulations of a fluidized bed using a multifluid EulerianEulerian model to represent the gas and solid phases as interpenetrating continua. Hydrodynamic results from the simulations were quantitatively compared with Xray flow visualization studies of a similar bed. It was found that the Gidaspow model can accurately predict the hydrodynamics of the biomass in a fluidized bed. The coefficient of restitution of biomass was fairly high and did not affect the hydrodynamics of the bed ...