Search results for: L.X. Zhou

Items from 1 to 20 out of 55 results

article

Two-fluid LES and RANS modeling of sudden-expansion gas-particle flows

L.X. Zhou, Y. Liu

Powder Technology > 2018 > 323 > C > 45-50

Sudden-expansion gas-particle flows are widely encountered in fluid and thermal engineering and are typical cases for basic studies. Both two-fluid large-eddy simulation (LES) and Reynolds averaged Navier-Stokes (RANS) modeling using a unified second-order (USM) two-phase turbulence model are studied in this paper. The advantage of LES is showing the detailed flow structures and improving the simulation...

article

A review for developing two-fluid modeling and LES of turbulent combusting gas-particle flows

L.X. Zhou

Powder Technology > 2016 > 297 > C > 438-447

Present two-fluid models are mainly for dense gas-particle flows and combustion in fluidized beds, where the particle-flow behavior, like the particle stress is determined only by inter-particle collision based on kinetic theory. For gas-particle flows and combustion in pulverized solid-fuel combustors and furnaces, where the particle dispersion is determined by its turbulent fluctuation, the mainly...

article

A review on studies of a SOM combustion model for single-and-two-phase combustion

L.X. Zhou, F. Wang, L.Y. Hu, K. Li, more

International Journal of Heat and Mass Transfer > 2016 > 96 > C > 154-163

To develop reasonable and economical turbulent combustion models is of vital importance in the simulation of single-phase and two-phase combustion in practical gas-turbine and rocket engine combustors, internal combustion engines, and industrial furnaces. Up to now, simple models, like EBU, EDM/EDC, presumed PDF-fast chemistry models, are widely used in commercial software, but frequently give unreasonable...

article

Large-eddy simulation of ethanol spray combustion using a SOM combustion model and its experimental validation

K. Li, L.X. Zhou, C.K. Chan, H.G. Wang

Applied Mathematical Modelling > 2015 > 39 > 1 > 36-49

In this paper, large-eddy simulation of ethanol spray-air combustion was made by using an Eulerian–Lagrangian approach, a sub-grid-scale kinetic energy stress model, and a filtered finite-rate combustion model with a sub-grid scale reaction rate, called second-order moment (SOM) combustion model, proposed by our research group. The simulation accounts for the sub-grid turbulence–spray–combustion interactions...

article

Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

Y. XIE, L.X. ZHOU

Pedosphere > 2013 > 23 > 3 > 402-408

To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(III)-containing groundwater. Empty bed contact time (EBCT), As(III) concentration in effluent, and the removal efficiency of As(III) through the column were investigated at pH 8.0 and...

article

Large eddy simulation of an ethylene–air turbulent premixed V-flame

Y.Y. Wu, C.K. Chan, L.X. Zhou

Journal of Computational and Applied Mathematics > 2011 > 235 > 13 > 3768-3774

Large eddy simulation (LES) using a dynamic eddy viscosity subgrid scale stress model and a fast-chemistry combustion model without accounting for the finite-rate chemical kinetics is applied to study the ignition and propagation of a turbulent premixed V-flame. A progress variable c-equation is applied to describe the flame front propagation. The equations are solved two dimensionally by a projection-based...

article

Numerical simulation of instantaneous flow structure of swirling and non-swirling coaxial-jet particle-laden turbulence flows

Y. Liu, L.X. Zhou, C.X. Xu

Physica A: Statistical Mechanics and its Applications > 2010 > 389 > 23 > 5380-5389

A subgrid scale two-phase second-order-moment (SGS-SOM) model based on the two-fluid continuum approach is presented for the analysis of the instantaneous flow structures of swirling and non-swirling coaxial-jet particle-laden turbulence flows. Since the interaction between the two-phase subgrid scale stresses and the anisotropy of two-phase subgrid scale stresses is fully considered, it is superior...

article

Large-eddy simulation of swirling gas-particle flows using a USM two-phase SGS stress model

Y. Liu, L.X. Zhou, C.X. Xu

Powder Technology > 2010 > 198 > 2 > 183-188

In large-eddy simulations (LES) of gas-particle flows most investigators use single-phase subgrid scale (SGS) stress models. The Interaction between the two-phase SGS stresses is not fully taken into account. In this paper, a unified second-order moment (USM) two-phase SGS stress model for the LES of gas-particle flows is proposed, in which the interaction between the two-phase SGS stresses and anisotropy...

article

Advances in studies on two-phase turbulence in dispersed multiphase flows

L.X. Zhou

International Journal of Multiphase Flow > 2010 > 36 > 2 > 100-108

Particle/droplet/bubble fluctuation and dispersion are important to mixing, heat and mass transfer, combustion and pollutant formation in dispersed multiphase flows, but are insufficiently studied before the 90 years of the last century. In this paper, the present author reports his systematic studies within nearly 20 years on two-phase turbulence in dispersed multiphase flows, including particle...

chapter

Ferroelectric and magnetic behavior of Pb(Zr_0.52Ti_0.48)O₃ based magnetoelectric nanocomposite films

W. Huang, L.X. Zhou, J. Zhu, X.H. Wei, more

2010 3rd International Nanoelectronics Conference (INEC) > 712 - 713

2010 IEEE 3rd International Nanoelectronics Conference (INEC 2010)

Magnetoelectric (ME) nanocomposite materials have attracted much interest due to the coupling among the electric, magnetic, and elastic order parameters and the ME effect, In this paper, the ??sandwich?? structure ME composite films of PZT/ NiFe₂O₄ (NFO)/PZT and PZT/CoFe₂O₄(CFO)/PZT were epitaxially grown on SrRuO₃/STO substrates by pulsed laser deposition (PLD). The effects of strain on the microstructures,...

article

Study on the growth and interfacial strain of CoFe2O4/BaTiO3 bilayer films

J. Zhu, L.X. Zhou, W. Huang, Y.Q. Li, more

Journal of Crystal Growth > 2009 > 311 > 12 > 3300-3304

CoFe ₂ O ₄ /BaTiO ₃ bilayer films were epitaxially deposited on SrTiO ₃ substrates by laser molecular beam epitaxy (LMBE). The growth process of the bilayer films was in-situ monitored by reflection high-energy electron diffraction (RHEED). Sixty nanometer thick-BTO layer was firstly fabricated in a layer-by-layer growth mode with an atomic smooth surface. CFO films...

chapter

Study on controllable reactor magnetic structure and loss based on ANSYS

Z.Q. Wang, Z.D. Yin, L.X. Zhou, Z.J. Wang, more

2009 4th IEEE Conference on Industrial Electronics and Applications > 201 - 205

2009 4th IEEE Conference on Industrial Electronics and Applications

Controllable reactor is an important voltage control and reactive power compensation device in power system which is wide range voltage application, high reliability, low harmonic and simple maintenance, etc. The reactor iron core magnetic field distribution directly affects the reactor's loss and other properties. In this paper, aiming at six kinds of typical controllable reactor core structure,...

article

Large-eddy simulation of turbulent combustion using different combustion models

L.X. Zhou, L.Y. Hu, F. Wang

Fuel > 2008 > 87 > 13-14 > 3123-3131

The second-order moment (SOM) combustion model proposed by the present authors is compared with eddy-break-up (EBU) and presumed probability density function (PDF) combustion models in large-eddy simulation of jet diffusion combustion, swirling diffusion combustion and premixed combustion behind a bluff body. The statistical results for time-averaged and RMS fluctuation temperatures are validated...

chapter

Study on power factor through the similarity of waveform

L.X. Zhou, Z.D. Yin, X.N. Xiao, Z.Q. Wang, more

2008 3rd IEEE Conference on Industrial Electronics and Applications > 1534 - 1537

2008 3rd IEEE Conference on Industrial Electronics and Applications

With the rapid development of electric electronic technology, non-linear loads, large capacity converters, etc. increase mostly, which brings about the serious problems such as harmonics. Thus, the traditional power theory based on the average is unable to meet with the practical require. In this paper, the power definition in the sinusoidal and non-sinusoidal circuit is discussed and the waveform...

chapter

Considerations on the coordinated control of controllable reactors

L.X. Zhou, Z.D. Yin, X.N. Xiao, Z.J. Wang, more

2008 5th International Conference on the European Electricity Market > 1 - 5

2008 5th International Conference on the European Electricity Market (EEM 2008)

In the extra-high voltage long transmission line, the non-allowed increasing of power voltage and the corresponding transient oscillation over-voltage are often occurred. The continued burning of the secondary arc usually keeps quite a long time for the high voltage level, long line and large capacity. There must lead to the failure of the re-closing if the secondary arc is not extinguished promptly,...

chapter

Power definition and energy measurement based on waveform similarity

L.X. Zhou, Z.D. Yin, X.N. Xiao

2008 IEEE/PES Transmission and Distribution Conference and Exposition > 1 - 5

2008 IEEE/PES Transmission and Distribution Conference & Exposition

For the characteristics of non-linear, imbalance and fluctuation, a large quantity of harmonic and negative sequence current will be injected to the power grid by the traction load of electric railway, which will lead to the serious distortion of the source voltage. Under this circumstance, the original definition of reactive power in the form of sine wave is unsuitable and inconvenient. Meanwhile,...

chapter

Electric energy measurement based on the effective absorbed power under non-sinusoidal conditions

L.X. Zhou, Z.D. Yin, X.N. Xiao, Y.W. Zhu, more

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies > 2081 - 2085

Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008

Along with the rapid development of power electronic technology, the application of non-liner load becomes more and more with the capacity becomes larger and larger. Massive harmonics are poured into the power grid, leading to the distortion of the system voltage and current. Meanwhile, the nonliner loads usually own complex characteristics such as power inrushing, three phase imbalance, harmonics,...

article

Comparison between a composition PDF transport equation model and an ASOM model for simulating a turbulent jet flame

F. Wang, L.X. Zhou, C.X. Xu, G.M. Goldin

International Journal of Heat and Mass Transfer > 2008 > 51 > 1-2 > 136-144

A composition PDF transport equation (PDF) model and an algebraic second-order moment (ASOM) model of turbulent combustion are used to simulate a methane–air turbulent jet flame, measured by the Sandia National Laboratory. In most regions, both PDF and ASOM predictions are in agreement with the experimental data with not too much difference. The PDF modeling results give the second-order moments with...

chapter

Research on PT Ferromagnetic Resonance Region and the Controllable Damping

L.X. Zhou, Z.D. Yin

2007 IEEE Lausanne Power Tech > 413 - 418

Power Tech 2007

In the neutral ungrounded system, potential transformer (PT) ferro-magnetic resonance is a kind of interior overvoltage which is frequently appears and creates most of the accidents. Whether the elimination measures are reasonable and effective or not affects the security and stability of the power system directly. Fundamental research has been done on the resonance region changeable situation and...

article

Epitaxial growth of the CoFe2O4 film on SrTiO3 and its characterization

W. Huang, L.X. Zhou, H.Z. Zeng, X.H. Wei, more

Journal of Crystal Growth > 2007 > 300 > 2 > 426-430

Cobalt ferrite (CoFe ₂ O ₄ ) thin film is epitaxially grown on (001) SrTiO ₃ (STO) by laser molecular beam epitaxy (LMBE). The growth modes of CoFe ₂ O ₄ (CFO) film are found to be sensitive to laser repetition, the transitions from layer-by-layer mode to Stranski–Krastanov (SK) mode and then to island mode occur at the laser repetition of 3 and 5Hz at 700°C,...

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INFONA - science communication portal

Search results for: L.X. Zhou

Two-fluid LES and RANS modeling of sudden-expansion gas-particle flows

A review for developing two-fluid modeling and LES of turbulent combusting gas-particle flows

A review on studies of a SOM combustion model for single-and-two-phase combustion

Large-eddy simulation of ethanol spray combustion using a SOM combustion model and its experimental validation

Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

Large eddy simulation of an ethylene–air turbulent premixed V-flame

Numerical simulation of instantaneous flow structure of swirling and non-swirling coaxial-jet particle-laden turbulence flows

Large-eddy simulation of swirling gas-particle flows using a USM two-phase SGS stress model

Advances in studies on two-phase turbulence in dispersed multiphase flows

Ferroelectric and magnetic behavior of Pb(Zr_0.52Ti_0.48)O₃ based magnetoelectric nanocomposite films

Study on the growth and interfacial strain of CoFe2O4/BaTiO3 bilayer films

Study on controllable reactor magnetic structure and loss based on ANSYS

Large-eddy simulation of turbulent combustion using different combustion models

Study on power factor through the similarity of waveform

Considerations on the coordinated control of controllable reactors

Power definition and energy measurement based on waveform similarity

Electric energy measurement based on the effective absorbed power under non-sinusoidal conditions

Comparison between a composition PDF transport equation model and an ASOM model for simulating a turbulent jet flame

Research on PT Ferromagnetic Resonance Region and the Controllable Damping

Epitaxial growth of the CoFe2O4 film on SrTiO3 and its characterization

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