Airflow Measurements and Evaluation of Effective Diffusion Coefficient in Large Scale of Mine Ventilation Network using with Tracer Gas Method

Sasaki, Kyuro; Widiatmojo, Arif; Arpa, Gabriel; Sugai, Yuichi

doi:10.2473/journalofmmij.125.614

Cited by 4 publications

(4 citation statements)

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“…All have shown the scattered result to each other. Further, it is still necessary to develop further numerical method for gas diffusion in mine airways to simulate the longer travelling time and high diffusion coefficient than those for circular tube flow as demonstrated by Sasaki, Widiatmojo, Arpa and Sugai [19]. The advantages of proposed DTPM are that the calculations of concentration gradient in space or time domain, which are commonly employed in numerical simulations, are not required.…”

Section: Introductionmentioning

confidence: 99%

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Discrete Tracer Point Method to Evaluate Turbulent Diffusion in Circular Pipe Flow

Widiatmojo¹,

Sasaki²,

Widodo³

et al. 2013

JFCMV

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Diffusion of a solute in turbulent flows through a circular pipe or tunnel is an important aspect of environmental safety. In this study, the diffusion coefficient of turbulent flow in circular pipe has been simulated by the Discrete Tracer Point Method (DTPM). The DTPM is a Lagrangian numerical method by a number of imaginary point displacement which satisfy turbulent mixing by velocity fluctuations, Reynolds stress, average velocity profile and a turbulent stochastic model. Numerical simulation results of points' distribution by DTPM have been compared with the analytical solution for turbulent plug-flow. For the case of turbulent circular pipe flow, the appropriate DTPM calculation time step has been investigated using a constant β, which represents the ratio between average mixing lengths over diameter of circular pipe. The evaluated values of diffusion coefficient by DTPM have been found to be in good agreement with Taylor's analytical equation for turbulent circular pipe flow by giving β = 0.04 to 0.045. Further, history matching of experimental tracer gas measurement through turbulent smooth-straight pipe flow has been presented and the results showed good agreement.

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Section: Introductionmentioning

confidence: 99%

“…In the real case, the utilization of tracer gas measurement is not merely straight pipe, but also tunnels network [19,[32][33][34][35]. This kind of network is assembled in the form of interconnecting tunnels which allow airflow to be separated or rejoined at junction.…”

Section: Simulation Of Tracer Gas Experiments Through Smooth-circular Pipmentioning

confidence: 99%

Discrete Tracer Point Method to Evaluate Turbulent Diffusion in Circular Pipe Flow

Widiatmojo¹,

Sasaki²,

Widodo³

et al. 2013

JFCMV

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“…To obtain velocity distributions in a mine is difficult because the tunnel walls are very rough, and measuring the air properties is difficult. Only a few studies have provided experimental data for measuring air velocities (Arpa et al, 2008;Sasaki et al, 2008;Xu et al, 2015;Lee et al, 2018). The experimental values, as obtained by Lee et al (2018), are 0.61 m/s and 0.51 m/s for the portal entry and shaft bottom station, respectively.…”

Section: Comparison Of Numerical and Experimental Resultsmentioning

confidence: 99%

“…They demonstrated that the turbulent diffusion coefficient is proportional to the length/diameter (L/D) of a mine. Sasaki et al (2008) simulated the numerical experiment of the tracer gas diffusion with the aim of predicting the effective turbulent diffusion coefficient in a mine. The numerical simulation results revealed that the turbulent velocity strength and velocity profile contribute to the effective diffusion coefficient.…”

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confidence: 99%

Airflow Analysis of a Large-Opening Limestone Mine using Computational Fluid Dynamics

Park,

Kim

2023

J. Korean Soc. Miner. Energy Resour. Eng.

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The main purpose of mine ventilation is providing fresh air to workers in mines. The other purpose is reducing dust or gases that are very harmful to human. To address these issues, two types of fans are used in modern mines: main fans and local fans. Main fans are installed to provide fresh air to the entire mine. However, more fresh air is needed as the depth of the mine increases and consequently the area percentage that the main fan can cover decreases. Local fans are required to provide fresh air in the local area that the main fan cannot cover. Local fans are usually located in galleries near mining faces in mines to reduce dust and gases and provide fresh air. Even though many studies have presented good data for understanding local mine ventilation, our knowledge on turbulent flow, ventilation problems, and gas diffusion of entire-mine ventilation remains incomplete. The present study is aimed at partially addressing this deficiency.Parra et al.

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Assessment of air dispersion characteristic in underground mine ventilation: Field measurement and numerical evaluation

Widiatmojo

Sasaki

Sugai

et al. 2015

Process Safety and Environmental Protection

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Airflow Measurements and Evaluation of Effective Diffusion Coefficient in Large Scale of Mine Ventilation Network using with Tracer Gas Method

Cited by 4 publications

References 4 publications

Discrete Tracer Point Method to Evaluate Turbulent Diffusion in Circular Pipe Flow

Discrete Tracer Point Method to Evaluate Turbulent Diffusion in Circular Pipe Flow

Airflow Analysis of a Large-Opening Limestone Mine using Computational Fluid Dynamics

Assessment of air dispersion characteristic in underground mine ventilation: Field measurement and numerical evaluation

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