نتایج جستجو برای: two phase flow particle interaction

تعداد نتایج: 3743039  

2013
S. M. Derakhshani D. L. Schott G. Lodewijks

Dust emissions can have significant effects on the human health, environment and industry equipment. Understanding the dust generation process helps to select a suitable dust preventing approach and also is useful to evaluate the environmental impact of dust emission. To describe these processes, numerical methods such as Computational Fluid Dynamics (CFD) are widely used, however nowadays part...

Journal: :iranian journal of hydrogen and fuel cell 0
hossein fathi department of mehcanical engineering, shahid bahonar university of kerman, kerman, iran seyed hossein mansouri department of mechanical engineering, shahid bahonar university of kerman, kerman, iran amir raoof department of earth sciences, utrecht university, utrecht, netherlands

the produced liquid water in cathode catalyst layer (ccl) has significant effect on the operation of proton exchange membrane fuel cell (pemfc). to investigate this effect, the transport of oxygen in ccl in the presence of immiscible liquid water is studied applying a two-dimensional pore scale model. the ccl was reconstructed as an agglomerated system. to explore the wettability effects, diffe...

Journal: :amirkabir international journal of modeling, identification, simulation & control 2014
mohammad amin tajeddini ali kamali

coriolis mass flow meters are one of the most accurate tools to measure the mass flow in the industry. however, two-phase mode (gas-liquid) may cause severe operating difficulties as well as decreasing certitude in measurement. this paper presents a method based on fuzzy systems to correct the error and improve the reliability of these sensors in the presence of two-phase model fluid. definite ...

1998
Valentin Zagrebnov

We consider a mean-field continuum model of classical particles in Rd with Ising or Heisenberg spins. The interaction has two ingredients, a ferromagnetic spin coupling and a spin-independent molecular force. We show that a feedback between these forces gives rise to a first-order phase transition with simultaneous jumps of particle density and magnetization per particle, either at the threshol...

2004
Francisco Pereira Morteza Gharib

A method is devised for true three-dimensional (3D) particle sizing in two-phase systems. Based on a ray-optics approximation of the Mie scattering theory for spherical particles, and under given assumptions, the principle is applicable to intensity data from scatterers within arbitrary interrogation volumes. It requires knowledge of the particle 3D location and intensity, and of the spatial di...

2011
Thierry Goudon Shi Jin Jian-Guo Liu Bokai Yan

We are concerned with a coupled system describing the interaction between suspended particles and a dense fluid. The particles are modeled by a kinetic equation of Vlasov-Fokker-Planck type, and the fluid is described by the incompressible Navier-Stokes system, with variable density. The systems are coupled through drag forces. High friction regimes lead to a purely hydrodynamic description of ...

2012
ANUPAM TIWARI JOHN ABRAHAM Anupam Tiwari

Submitted for the MAR06 Meeting of The American Physical Society Dissipative Particle Dynamics Simulations of Two-Phase Flows ANUPAM TIWARI, JOHN ABRAHAM, School of Mechanical Engineering, Purdue University — Dissipative particle dynamics (DPD) is a coarse-grained particle method that includes thermal fluctuations. A mean-field theory based model is developed for two-phase flows. Surface tensio...

2005
FREDERIC MOURET LYES KADEM ERIC BERTRAND JEAN G. DUMESNIL PHILIPPE PIBAROT REGIS RIEU

A complete understanding of the flow past a mitral valve prosthesis require a new generation of pulse duplicators and more realistic flow conditions. The objective of this study is to describe the opening kinetics of a monoleaflet Medtronic Hall 27-mm mechanical valve in mitral position and to determine the flow pattern within the left ventricle using particle image velocimetry (PIV) for differ...

Journal: :journal of heat and mass transfer research(jhmtr) 2014
maziar dehghan hassan basirat tabrizi

this study is concerned with the prediction of particles’ velocity in a dilute turbulent gas-solidboundary layer flow using a fully eulerian two-fluid model. the closures required for equationsdescribing the particulate phase are derived from the kinetic theory of granular flows. gas phaseturbulence is modeled by one-equation model and solid phase turbulence by mlh theory. resultsof one-way and...

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