double flash

Noun

 * 1) The characteristic visual phenomenon produced by the atmospheric detonation of a nuclear weapon, consisting of a very brief, bright flash of light which dims rapidly, followed by a second, gradually brightening flash.
 * 2)  A system using two flash separators to separate phases of a working fluid.
 * 1)  A system using two flash separators to separate phases of a working fluid.
 * 1)  A system using two flash separators to separate phases of a working fluid.
 * 1)  A system using two flash separators to separate phases of a working fluid.