Study on influence of drill pipe rotation speed on coal particles-gas flow characteristics in negative pressure sampling process
1 School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454003,China
2 State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Jiaozuo Henan 454003,China
3 State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,Henan Polytechnic University,Jiaozuo Henan 454003,China
4 Art College,Xiangtan University,Xiangtan Hunan 411100,China
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