About critical conditions of initiation of the fires

摘要

The problem of stability of the charged interface between two ideal fluids is considered with presence of the velocity jump across the interface. It was take into account that fluids having various dencity is not mixing LIP and each of which fills in half-infinite space. The upper liquid move along interface with variable in time velocity. The time dependence of velocity results to instability of interface and to decrease of critical surface density of a charge necessary for an initiation of the instability Tonks-Frenkel and the st. Elmo fires.