Experimental and numerical study of fluid dynamic parameters in a jetting fluidized bed of a binary mixture

A numerical study of non-linear, high amplitude standing waves in non-cylindrical circular resonators is reported here. These waves are shock-less and can generate peak acoustic overpressures that can exceed the ambient pressure by three/four times its nominal value. A high fidelity compressible computational fluid dynamic model is used to simulate the phenomena in cylindrical and arbitrarily shaped axisymmetric resonators. A right circular cylinder and frustum of cone are the two geometries studied. The model is validated using past numerical and experimental results of standing waves in cylindrical resonators. The non-linear nature of the harmonic response of the frustum of cone resonator system is investigated for two different working fluids (carbon dioxide and argon) operating at various values of piston amplitude. The high amplitude non-linear oscillations demonstrated can be used as a prime mover in a variety of applications including thermoacoustic cryocooling.

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Fluid dynamic modelling and simulation of circulating fluidized bed reactors: analyses of particle phase stress models

Computers & Chemical Engineering ◽

10.1016/s0098-1354(98)00143-4 ◽

1998 ◽

Vol 22 ◽

pp. S763-S766 ◽

Cited By ~ 5

Author(s):

J.J.N. Alves ◽

M. Mori

Keyword(s):

Fluidized Bed ◽

Circulating Fluidized Bed ◽

Fluid Dynamic ◽

Dynamic Modelling ◽

Modelling And Simulation ◽

Fluidized Bed Reactors ◽

Particle Phase ◽

Stress Models

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Numerical study of the fluid-dynamic loading on pipes conveying fluid with a laminar velocity profile

Journal of Fluids and Structures ◽

10.1016/j.jfluidstructs.2018.04.006 ◽

2018 ◽

Vol 80 ◽

pp. 441-450

Author(s):

Gregor Bobovnik ◽

Jože Kutin

Keyword(s):

Velocity Profile ◽

Dynamic Loading ◽

Numerical Study ◽

Fluid Dynamic ◽

Pipes Conveying Fluid ◽

Conveying Fluid

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Fluid-dynamic behavior of flaxseed fluidized and spouted bed

Ciência Rural ◽

10.1590/0103-8478cr20160644 ◽

2017 ◽

Vol 47 (10) ◽

Author(s):

Elza Brandão Santana ◽

Maria da Conceição da Costa Valente ◽

Lorena Gomes Corumbá ◽

Elisangela Lima Andrade ◽

Cristiane Maria Leal Costa ◽

...

Keyword(s):

Fluidized Bed ◽

Dynamic Behavior ◽

Seed Treatment ◽

Fluid Dynamic ◽

Seed Processing ◽

Linum Usitatissimum L ◽

Air Temperatures ◽

Physiological Properties ◽

Physiological Quality

ABSTRACT: Processing of particles in a moving bed, such as a fluidized bed or a spouting bed, is commonly used in the operations of drying, coating, and granulation of particulate systems. This process has applications in the chemical, pharmaceutical and, presently, agronomical industries, especially for seed treatment/coating. This research aimed to analyze the fluid-dynamic behavior of fluidized and spouting beds with different air temperatures and loads of flaxseeds (Linum usitatissimum L.), with estimates of the fluid-dynamic parameters correlated to each process. The parameters were compared with the values obtained from classical correlations in the literature, with indications of associated percentages of deviation. Influence of fluid dynamics on the physiological quality of seeds was assessed by germination tests and the germination speed index. An analysis of the results indicated that seed processing was adequate for processing in dynamically active beds; however, temperatures above 50ºC in both beds caused significant reductions in the physiological quality of the seeds. Processing in a fluidized bed presented a smaller reduction of the physiological properties of the flaxseed.

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Experimental and Numerical Study of Vortex Induced Vibrations on a Spool Model

Volume 2: CFD and FSI ◽

10.1115/omae2018-77305 ◽

2018 ◽

Cited By ~ 1

Author(s):

David Gross ◽

Yann Roux ◽

Benjamin Rousse ◽

François Pétrié ◽

Ludovic Assier ◽

...

Keyword(s):

Stokes Equations ◽

Numerical Study ◽

Fluid Dynamic ◽

Navier Stokes ◽

Navier Stokes Equations ◽

Flow Perturbation ◽

Industry Standards ◽

Vortex Induced Vibrations ◽

Recommended Practices ◽

Decay Tests

The problem of Vortex-Induced Vibrations (VIV) on spool and jumper geometries is known to present several drawbacks when approached with conventional engineering tools used in the study of VIV on risers. Current recommended practices can lead to over-conservatism that the industry needs to quantify and minimize within notably cost reduction objectives. Within this purpose, the paper will present a brief critical review of the Industry standards and more particularly focus on both experimental and Computational Fluid Dynamic (CFD) approaches. Both qualitative and quantitative comparisons between basin tests and CFD results for a 2D ‘M-shape’ spool model will be detailed. The results presented here are part of a larger experimental and numerical campaign which considered a number of current velocities, heading and geometry configurations. The vibratory response of the model will be investigated for one of the current velocities and compared with the results obtained through recommended practices (e.g. Shear7 and DNV guidelines). The strategy used by the software K-FSI to solve the fluid-structure interaction (FSI) problem is a partitioned coupling solver between fluid solver (FINE™/Marine) and structural solvers (ARA). FINE™/Marine solves the Reynolds-Averaged Navier-Stokes Equations in a conservative way via the finite volume method and can work on structured or unstructured meshes with arbitrary polyhedrons, while ARA is a nonlinear finite element solver with a large displacement formulation. The experiments were conducted in the BGO FIRST facility located in La Seyne sur Mer, France. Particular attention was paid towards the model design, fabrication, instrumentation and characterization, to ensure an excellent agreement between the structural numerical model and the actual physical model. This included the use of a material with low structural damping, the performance of stiffness and decay tests in air and in still water, plus the rationalization of the instrumentation to be able to capture the response with the minimum flow perturbation or interaction due to instrumentation.

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