The Experts below are selected from a list of 9072 Experts worldwide ranked by ideXlab platform
Haosheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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dem les simulation of coal combustion in a bubbling fluidized bed part ii coal combustion at the Particle level
Chemical Engineering Science, 2004Co-Authors: Haosheng Zhou, Gilles Flama, Daniel J GauthieAbstract:The discrete element method-large eddy simulation (DEM-LES) is used to model coal combustion at the Particle level in a bubbling fluidized bed. The gas phase is modelled as a continuum and the solid phase is modeled by DEM. Chemical reactions consist in the heterogeneous reactions of char with O2, CO, CO2, NO, and N2O, and in the homogeneous reactions involving CO, O2, NO, and N2O. The Colliding Particle–Particle heat transfer is based on the analysis of the elastic deformation of the spheres during their contact. The model predicts the effects of the Particle heterogeneous flow structure on the thermal characteristics of coal Particles when heating and burning, and the gaseous emissions from a fluidized sand–coal binary mixture. The heating rates are 1627 and for, respectively, 0.8 and diameter coal Particles fed into the fluidized bed. The instantaneous contribution of the collision heat transfer is weak, less than 5.0% of the total power exchanges (coal combustion, radiation, convection and collision) during the heating and 1.5% during the combustion. The temperature of the coal Particles exceeds the bed temperature, which is in qualitative agreement with experimental data from literature. The effects of the diameter of coal Particles, of the bed temperature, and of the inlet gas velocity on the thermal characteristics are also studied.
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dem les simulation of coal combustion in a bubbling fluidized bed part ii coal combustion at the Particle level
Chemical Engineering Science, 2004Co-Authors: Haosheng Zhou, Gilles Flamant, Daniel J GauthierAbstract:The discrete element method-large eddy simulation (DEM-LES) is used to model coal combustion at the Particle level in a bubbling fluidized bed. The gas phase is modelled as a continuum and the solid phase is modeled by DEM. Chemical reactions consist in the heterogeneous reactions of char with O2, CO, CO2, NO, and N2O, and in the homogeneous reactions involving CO, O2, NO, and N2O. The Colliding Particle–Particle heat transfer is based on the analysis of the elastic deformation of the spheres during their contact. The model predicts the effects of the Particle heterogeneous flow structure on the thermal characteristics of coal Particles when heating and burning, and the gaseous emissions from a fluidized sand–coal binary mixture. The heating rates are 1627 and for, respectively, 0.8 and diameter coal Particles fed into the fluidized bed. The instantaneous contribution of the collision heat transfer is weak, less than 5.0% of the total power exchanges (coal combustion, radiation, convection and collision) during the heating and 1.5% during the combustion. The temperature of the coal Particles exceeds the bed temperature, which is in qualitative agreement with experimental data from literature. The effects of the diameter of coal Particles, of the bed temperature, and of the inlet gas velocity on the thermal characteristics are also studied.
Hoanglong Ngo - One of the best experts on this subject based on the ideXlab platform.
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semi implicit milstein approximation scheme for non Colliding Particle systems
Calcolo, 2019Co-Authors: Ductrong Luong, Hoanglong NgoAbstract:We introduce a semi-implicit Milstein approximation scheme for some classes of non-Colliding Particle systems modeled by systems of stochastic differential equations with non-constant diffusion coefficients. We show that the scheme converges at the rate of order 1 in the mean-square sense.
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semi implicit milstein approximation scheme for non Colliding Particle systems
arXiv: Probability, 2018Co-Authors: Hoanglong Ngo, Ductrong LuongAbstract:We introduce a semi-implicit Milstein approximation scheme for some class of non-Colliding Particle systems modeled by systems of stochastic differential equations with non-constant diffusion coefficients. We show that the scheme converges at the rate of order 1 in the mean-square sense.
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semi implicit euler maruyama approximation for non Colliding Particle systems
arXiv: Probability, 2017Co-Authors: Hoanglong Ngo, Dai TaguchiAbstract:We introduce a semi-implicit Euler-Maruyama approximation which preservers the non-Colliding property for some class of non-Colliding Particle systems such as Dyson Brownian motions, Dyson-Ornstein-Uhlenbeck processes and Brownian Particles systems with nearest neighbour repulsion, and study its rates of convergence in both $L^p$-norm and path-wise sense.
Jacek Malecki - One of the best experts on this subject based on the ideXlab platform.
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strong solutions of non Colliding Particle systems
arXiv: Probability, 2014Co-Authors: Piotr Graczyk, Jacek MaleckiAbstract:We study systems of stochastic differential equations describing positions x_1,x_2,...,x_p of p ordered Particles, with inter-Particles repulsions of the form H_{ij}(x_i,x_j)/(x_i-x_j). We show the existence of strong and pathwise unique non-Colliding solutions of the system with a Colliding initial point x_1(0)\leq ...\leq x_p(0) in the whole generality, under natural assumptions on the coefficients of the equations.
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strong solutions of non Colliding Particle systems
Electronic Journal of Probability, 2014Co-Authors: Piotr Graczyk, Jacek MaleckiAbstract:We study systems of stochastic differential equations describing positions $x_1,x_2,\ldots,x_p$ of $p$ ordered Particles, with inter-Particles repulsions of the form $\displaystyle{\frac{H_{ij}(x_i,x_j)}{x_i-x_j}}$. We show the existence of strong and pathwise unique non-Colliding solutions of the system with a Colliding initial point $x_1(0)\leq \ldots\leq x_p(0)$ in the whole generality, under natural assumptions on the coefficients of the equations.
Daniel J Gauthie - One of the best experts on this subject based on the ideXlab platform.
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dem les simulation of coal combustion in a bubbling fluidized bed part ii coal combustion at the Particle level
Chemical Engineering Science, 2004Co-Authors: Haosheng Zhou, Gilles Flama, Daniel J GauthieAbstract:The discrete element method-large eddy simulation (DEM-LES) is used to model coal combustion at the Particle level in a bubbling fluidized bed. The gas phase is modelled as a continuum and the solid phase is modeled by DEM. Chemical reactions consist in the heterogeneous reactions of char with O2, CO, CO2, NO, and N2O, and in the homogeneous reactions involving CO, O2, NO, and N2O. The Colliding Particle–Particle heat transfer is based on the analysis of the elastic deformation of the spheres during their contact. The model predicts the effects of the Particle heterogeneous flow structure on the thermal characteristics of coal Particles when heating and burning, and the gaseous emissions from a fluidized sand–coal binary mixture. The heating rates are 1627 and for, respectively, 0.8 and diameter coal Particles fed into the fluidized bed. The instantaneous contribution of the collision heat transfer is weak, less than 5.0% of the total power exchanges (coal combustion, radiation, convection and collision) during the heating and 1.5% during the combustion. The temperature of the coal Particles exceeds the bed temperature, which is in qualitative agreement with experimental data from literature. The effects of the diameter of coal Particles, of the bed temperature, and of the inlet gas velocity on the thermal characteristics are also studied.
Daniel J Gauthier - One of the best experts on this subject based on the ideXlab platform.
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dem les simulation of coal combustion in a bubbling fluidized bed part ii coal combustion at the Particle level
Chemical Engineering Science, 2004Co-Authors: Haosheng Zhou, Gilles Flamant, Daniel J GauthierAbstract:The discrete element method-large eddy simulation (DEM-LES) is used to model coal combustion at the Particle level in a bubbling fluidized bed. The gas phase is modelled as a continuum and the solid phase is modeled by DEM. Chemical reactions consist in the heterogeneous reactions of char with O2, CO, CO2, NO, and N2O, and in the homogeneous reactions involving CO, O2, NO, and N2O. The Colliding Particle–Particle heat transfer is based on the analysis of the elastic deformation of the spheres during their contact. The model predicts the effects of the Particle heterogeneous flow structure on the thermal characteristics of coal Particles when heating and burning, and the gaseous emissions from a fluidized sand–coal binary mixture. The heating rates are 1627 and for, respectively, 0.8 and diameter coal Particles fed into the fluidized bed. The instantaneous contribution of the collision heat transfer is weak, less than 5.0% of the total power exchanges (coal combustion, radiation, convection and collision) during the heating and 1.5% during the combustion. The temperature of the coal Particles exceeds the bed temperature, which is in qualitative agreement with experimental data from literature. The effects of the diameter of coal Particles, of the bed temperature, and of the inlet gas velocity on the thermal characteristics are also studied.