scholarly journals MODELING ATMOSPHERE COMPOSITION AND DETERMINING EXPLOSIBILITY IN A SEALED COAL MINE VOLUME

2014 ◽  
Vol 59 (1) ◽  
pp. 25-40 ◽  
Author(s):  
Jianwei Cheng ◽  
Yi Luo
Keyword(s):  
Mathematical Model ◽  
Control Volume ◽  
Inert Gases ◽  
Mine Safety ◽  
Air Leakage ◽  
Gas Explosion ◽  
Triangle Diagram ◽  
Underground Coal Mines ◽  
Control Volume Approach ◽  
Explosion Risk

Abstract Explosions originated from or around the sealed areas in underground coal mines present a serious safety threat. The explosibility of the mine atmosphere depends on the composition of oxygen, combustible and inert gases. In additional, the composition in the inaccessible sealed areas change with time under various factors, such as gases emissions, air leakage, inert gases injected, etc. In order to improve mine safety, in this paper, a mathematical model based on the control volume approach to simulate the atmosphere compositions is developed, and the expanded Coward explosibility triangle diagram is used to assess the mine gas explosion risk. A computer program is developed to carry out the required computations and to display the results. In addition, the USBM explosibility diagram is also included in the program to serve as a double check.

A Real-Time Mathematical Model for Three-Dimensional Tidal Flow and Water Quality

1991 ◽  
Vol 24 (6) ◽  
pp. 171-177 ◽  
Author(s):  
Zeng Fantang ◽  
Xu Zhencheng ◽  
Chen Xiancheng
Keyword(s):  
Mathematical Model ◽  
Water Quality ◽  
Real Time ◽  
Control Volume ◽  
Tidal Flow ◽  
Three Dimensional ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Practical Application ◽  
The Pearl River

A real-time mathematical model for three-dimensional tidal flow and water quality is presented in this paper. A control-volume-based difference method and a “power interpolation distribution” advocated by Patankar (1984) have been employed, and a concept of “separating the top-layer water” has been developed to solve the movable boundary problem. The model is unconditionally stable and convergent. Practical application of the model is illustrated by an example for the Pearl River Estuary.

A new simple methodology for evaluation of explosion risk in underground coal mines

2013 ◽  
Vol 26 (6) ◽  
pp. 1524-1529 ◽  
Author(s):  
Ljiljana Medic Pejic ◽  
Javier García Torrent ◽  
Enrique Querol ◽  
Kazimierz Lebecki
Keyword(s):  
Coal Mines ◽  
Underground Coal Mines ◽  
Explosion Risk

A Control-Volume Model of the Compressible Euler Equations with a Vertical Lagrangian Coordinate

2013 ◽  
Vol 141 (7) ◽  
pp. 2526-2544 ◽  
Author(s):  
Xi Chen ◽  
Natalia Andronova ◽  
Bram Van Leer ◽  
Joyce E. Penner ◽  
John P. Boyd ◽  
...  
Keyword(s):  
Euler Equations ◽  
Control Volume ◽  
Test Cases ◽  
Riemann Solver ◽  
New Approach ◽  
Vertical Coordinate ◽  
Low Mach Number ◽  
Atmospheric Flows ◽  
Lagrangian Coordinate ◽  
Control Volume Approach

Abstract Accurate and stable numerical discretization of the equations for the nonhydrostatic atmosphere is required, for example, to resolve interactions between clouds and aerosols in the atmosphere. Here the authors present a modification of the hydrostatic control-volume approach for solving the nonhydrostatic Euler equations with a Lagrangian vertical coordinate. A scheme with low numerical diffusion is achieved by introducing a low Mach number approximate Riemann solver (LMARS) for atmospheric flows. LMARS is a flexible way to ensure stability for finite-volume numerical schemes in both Eulerian and vertical Lagrangian configurations. This new approach is validated on test cases using a 2D (x–z) configuration.

Explosibility Safety Factor: An Approach to Assess Mine Gas Explosion Risk

2013 ◽  
Vol 51 (2) ◽  
pp. 309-323 ◽  
Author(s):  
Jianwei Cheng ◽  
Yi Luo ◽  
Fubao Zhou
Keyword(s):  
Safety Factor ◽  
Gas Explosion ◽  
Mine Gas ◽  
Explosion Risk

Mathematical Model of Multi-Layer Wall with Phase Change Material and its Use in Optimal Design

2013 ◽  
Vol 649 ◽  
pp. 295-298
Author(s):  
Lubomir Klimes ◽  
Pavel Charvát ◽  
Josef Stetina
Keyword(s):  
Mathematical Model ◽  
Optimal Design ◽  
Phase Change ◽  
Phase Change Material ◽  
Control Volume ◽  
Operational Conditions ◽  
Volume Method ◽  
The Mathematical Model ◽  
Change Material

The paper deals with the mathematical model of the multi-layer wall containing the phase change material (PCM). The model utilizes the effective heat capacity method for modeling the latent heat of phase change and the control volume method is used for the discretization of the model. The utilization of the model is then demonstrated on the problem of the optimal design of the multi-layer wall with the PCM. The TMY2 data for the city of Brno were used in simulations as operational conditions. The main attention is aimed at the determination of the optimal thickness of the PCM layer for the multi-layer wall design with various thicknesses of the masonry.

On the internal generation of waves: control volume approach

2011 ◽  
Vol 38 (8-9) ◽  
pp. 1027-1029 ◽  
Author(s):  
Gunwoo Kim ◽  
Myung Eun Lee
Keyword(s):  
Control Volume ◽  
Control Volume Approach ◽  
Internal Generation

Iron Mine Exploitation Application of Man a Machine Positioning System of Underground Coal Mines Based on the ZigBee Technology in Loufan Ludi Mining Company

2013 ◽  
Vol 694-697 ◽  
pp. 2257-2264
Author(s):  
De Zhang ◽  
Li Gang Yan
Keyword(s):  
Network Formation ◽  
Safety Management ◽  
Coal Mines ◽  
Mine Safety ◽  
Positioning System ◽  
Mining Company ◽  
Zigbee Technology ◽  
Underground Coal Mines ◽  
Iron Mine ◽  
Limited Company

Man and machine Positioning System of Underground Coal Mines in the Iron Mine Exploitation of Loufan Ludi Mining Limited Company is based on the ZigBee Wireless Communication Technology. It realizes the effective management of the precise positioning of Man-machine and the workers. This article describes the composition of the system, the performance and management of content and network formation. The application practice shows that the underground man-machine positioning system based on ZigBee technology has played an important role in the underground personnel information management and security hedge. Such system could better meet the needs of the mine safety management and there is great prospect of application of it.

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