Abstract
The cube-root law and the expression of the maximum overpressure rise rate available in the most literatures are accurate when they are used to calculate or assess the gas explosion intensity in a spherical vessel, however, large deviation will be occurred when they are extended to the vessels of other shapes and sizes. The deflagration index KG expression for the cylindrical vessel case is put forward and discussed, and the difference between the deflagration index formula of the spherical and cylindrical vessel are also simply discussed. The conclusions drawn by this paper may be useful to the gas explosion intensity calculation or assessment in cylindrical vessel explosions.
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