Study on multiphase flow field of gas transportation in drivage face

Based on theories of multiphase fluid mechanics, the gas transportation and concentration distribution in drivage face were studied in this paper. According to gas transportation characteristics in drivage working face, reasonable simplification was made, and two-phase flow transportation model for gas and air was established, then gas transportation characteristics in drivage face were theoretically deduced. In this paper, the gas transportation in drivage working face was also numerically simulated by common CFD software, and the distribution and transportation law of gas in some sections of the laneway were elicited. The results indicate: (1) The gas transportation in mine atmosphere is essentially the quality transmission process of gas in the flow; (2) The main factors having influences on gas transportation in the laneway are convection, molecule diffusion, turbulent flow diffusion and displacement transportation; (3) The main gas accumulation regions are the laneway corners, the laneway roof, the combining part of digging laneway and main laneway.