Results 51 - 60 of 83

• Using Ultrasonic Anemometers to Evaluate Face Ventilation Conditions
  2/1/2007 - Conference papers
  The fact that methane ignitions continue to occur at the mining face indicates that monitoring with machine-mounted methanometers does not always indicate the presence of high methane concentrations. Methane concentrations at the face change quickly du...
• Factors Affecting the Development of Mine Face Ventilation Systems in the 20th Century
  2/1/2007 - Conference papers
  During the 20th century, the increased emphasis on worker health and safety and the advent of new mining equipment and methods led to many changes in mine face ventilation practices.
• Novel Stopping Designs for Large-Opening Metal/Nonmetal Mines
  6/1/2006 - Conference papers
  The Super Stopping is designed as a long-term permanent stopping for use in the main entries of the mine, while the EZ-Up Curtain Stopping, although very durable, is designed more for portability and ease of installation. This paper describes the design...
• Methane Control at Continuous Miner Sections
  6/1/2006 - Book chapters, Information Circulars
  This chapter gives guidelines for preventing methane gas explosions at continuous miner sections in coal mines, both at continuous miners and at roof bolters. The need to control peak methane emissions is particularly stressed. Emphasis is also placed...
• Maximizing the Ventilation of Large-Opening Mines
  6/1/2006 - Conference papers
  NIOSH research suggest that by incorporating ventilation planning into the mine planning process, using propeller fans, developing new stopping materials and construction methods, and using long pillars to eliminate crosscuts where possible, the ventila...
• Handbook for Methane Control in Mining
  6/1/2006 - Information Circulars
  This handbook describes effective methods for the control of methane gas in mines and tunnels. It assumes the reader is familiar with mining.
• Technology News 519 - EZ-Up Curtain Stoppings: A Practical Solution for Directing Ventilation Airflows in Large-opening Metal/Nonmetal Mines
  5/1/2006 - Technology News
  The EZ-Up curtain stopping is designed primarily for use as a temporary or portable stopping, although test results indicate that it may remain durable for an extended time. It can be constructed from a variety of fabrics, including standard mine bratti...
• Using Ultrasonic Anemometers to Evaluate Factors Affecting Face Ventilation Effectiveness
  1/1/2006 - Peer reviewed journal articles
  A test system was developed at NIOSH's ventilation test gallery to measure airflow using a three-axis ultrasonic anemometer. The gallery was used to simulate face airflow conditions in underground mines having a blowing curtain. Airflow data were used t...
• Experimental and Modeling Investigation of the Effect of Ventilation on Smoke Rollback in a Mine Entry
  1/1/2006 - Peer reviewed journal articles
  Results of diesel fuel fire experiments were conducted to determine the critical air velocity for preventing smoke rollback. Experimental results compared well with model predictions based on a computational fluid dynamics fire dynamics simulator.
• The Critical Ventilation Velocity in Tunnel Fires - A Computer Simulation
  4/1/2005 - Peer reviewed journal articles
  Discusses a study that used a CFD program (fire dynamics simulator) based on large eddy simulations (LES) to model floor-level fires in a ventilated tunnel. The CFD results are compared with two simple theories of critical ventilation.