Process Saf Environ Prot 104:240–253Ĭheng WM, Hu XM, Xie J, Zhao YY (2017) An intelligent gel designed to control the spontaneous combustion of coal: fire prevention and extinguishing properties. Int J Heat Mass Transf 61:499–504Ĭheng WM, Yu HM, Zhou G, Nie W (2016) The diffusion and pollution mechanisms of airborne dusts in fully-mechanized excavation face at mesoscopic scale based on CFD-DEM. In the case of relatively large air supply rate, the residual coal spontaneous combustion area in goaf is far from the working face and the spontaneous combustion area becomes relatively large, resulting in increased risk.īyon C, Kim SJ (2013) The effect of the particle size distribution and packing structure on the permeability of sintered porous wicks. (3) The main air leakage occurs in the range of 0–10 m along the dip direction of working face. (2) The data of air flow along the dip direction of working face obtained through the CFD numerical simulation is consistent with the actual measurement results basically, which validate the simulation. With the increase of the length of goaf, the porosity decreases, and with the increase of the height of goaf, the porosity in the two cross headings is first larger than that in the central part and then smaller than that in the central part. The results show that (1) the porosity in the central part and near the working face of goaf is relatively large. The quantitative porosity data of goaf are extracted and imported into FLUENT to simulate the air leakage flow field in goaf. In order to study and master air leakage flow field distribution in goaf, the particle flow numerical simulation software PFC 3D is used for the simulation of the collapse of overlying rock strata with the actual situation of the 3308 working face of Liangbaosi Coal Mine in China taken as an example.

Select Analyze/Perform integration… to perform a scalar Integration of each of the last 6 items over your surface zones to calculate, respectively, X-, Y- and Z-Force, and X-, Y- and Z-Moment.The air leakage in goaf can easily lead to disasters such as spontaneous combustion process of residual coal and gas accumulation, threatening production safety in underground coal mines.With the dynamic viscosity of your fluid (consistent with the dimensions or nondimensionalization of your data) specify Cell Center for New var location:

Tecplot vs origin