坑内ガスの流動に関する研究
1967 年 83 巻 954 号 p. 1135-1140
詳細
1967 年 83 巻 954 号 p. 1135-1140
When one or some kinds of gas are contained in a limited range of an underground airway, they are diffused by being conveyed by the air current and their rates of flow become lower and lower with the distance of flow. This diffusionhas been discussed by making use of the rates of flow of CO and CO2 gas measured at the exhaust shaft mouth of the Yamano coal mine for two and a half hours after the explosion of June 1, 1965. It has been found that it needs 0.3 times the average flow time l/v for a small amount of gas conveyed by an air current of a mean velocity v to pass entirely through a cross-section at a distance of l.
