Investigation of mixing mechanisms and energy balance in reactive extrusion using three-dimensional numerical simulation method

2005 ◽  
Vol 48 (16) ◽  
pp. 3411-3422 ◽  
Author(s):  
Linjie Zhu ◽  
Kwabena A. Narh ◽  
Kun S. Hyun
Keyword(s):  
Numerical Simulation ◽  
Energy Balance ◽  
Three Dimensional ◽  
Reactive Extrusion ◽  
Simulation Method ◽  
Numerical Simulation Method

scholarly journals Study of the Effect of Centrifugal Force on Rotor Blade Icing Process

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Zhengzhi Wang ◽  
Chunling Zhu
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Force ◽  
Rotor Blade ◽  
Flow Direction ◽  
Three Dimensional ◽  
Simulation Method ◽  
Two Phase ◽  
Numerical Simulation Method ◽  
Calculation Results ◽  
Flow Field Characteristics

In view of the rotor icing problems, the influence of centrifugal force on rotor blade icing is investigated. A numerical simulation method of three-dimensional rotor blade icing is presented. Body-fitted grids around the rotor blade are generated using overlapping grid technology and rotor flow field characteristics are obtained by solving N-S equations. According to Eulerian two-phase flow, the droplet trajectories are calculated and droplet impingement characteristics are obtained. The mass and energy conservation equations of ice accretion model are established and a new calculation method of runback water mass based on shear stress and centrifugal force is proposed to simulate water flow and ice shape. The calculation results are compared with available experimental results in order to verify the correctness of the numerical simulation method. The influence of centrifugal force on rotor icing is calculated. The results show that the flow direction and distribution of liquid water on rotor surfaces change under the action of centrifugal force, which lead to the increasing of icing at the stagnation point and the decreasing of icing on both frozen limitations.

Development of Numerical Simulation Method for Relocation Behavior of Molten Debris in Nuclear Reactors: 1 — Preliminary Analysis of Relocation of Molten Debris to Lower Plenum

2013 ◽  
Author(s):  
Susumu Yamashita ◽  
Hiroyuki Yoshida ◽  
Kazuyuki Takase
Keyword(s):  
Numerical Simulation ◽  
Solid Phase ◽  
Initial Conditions ◽  
Three Dimensional ◽  
Simulation Models ◽  
Simulation Method ◽  
Melting Behavior ◽  
Hydraulic Simulation ◽  
Numerical Simulation Method ◽  
Two Phases

We developed the numerical simulation method for predicting the melting core behavior including solidification and relocation based on the three-dimensional multi-phase thermal-hydraulic simulation models. In this code, each of gas, liquid and solid phase are treated individually, and interface between two phases are simulated directly. In this paper, the developed code was applied to numerical simulations of the melting behavior of the simulated fuel assemblies and reactor structures. In the simulation, complicated structures in the BWR lower plenum was simply modeled. A decay heat in molten or solidified debris was also considered. Moreover, several different initial conditions were used to check performance of this code and to evaluate adequacy of the present numerical method. From the present numerical results, it was confirmed that relocation of molten debris in the BWR lower plenum can be simulated by the currently developed code including effects of melting and solidification of debris.

Simulation of the Flow Parameters of the Multi-Microchannel Aerostatic Restrictor

2012 ◽  
Vol 241-244 ◽  
pp. 1278-1284
Author(s):  
Yu Bing Zhang ◽  
Cai Qin Li ◽  
Dong Sheng Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Film Thickness ◽  
Three Dimensional ◽  
Simulation Method ◽  
Gas Pressure ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Flow Parameters ◽  
Numerical Simulation Method

A numerical simulation method, FLUENT,has been selected to simulate the flow field parameters of the multi-microchannel aerostatic restrictor. Pressure, temperature and velocity distributions of the restrictor under different gas film thickness and gas pressure were got and compared. Used Pro / E to establish three-dimensional model of restrictor and imported it into GAMBIT for meshing, and then used FLUENT for simulation.

Three-dimensional numerical simulation method for gas–solid injector

2005 ◽  
Vol 160 (3) ◽  
pp. 180-189 ◽  
Author(s):  
Yuanquan Xiong ◽  
Mingyao Zhang ◽  
Zhulin Yuan
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Simulation Method ◽  
Numerical Simulation Method
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