  We consider the evolution of a spherically symmetric Quark-Gluon Plasma (QGP)
drop with limited size in the framework of relativistic hydrodynamics. In the
presence of the boundary, the expanding and cooling of QGP drop may appear as
oscillating processes, which realize via multiple traveling of rarefaction and
compression waves through the plasma and lead to increasing of plasma
life-time. Within this picture, deflagration is the main possible way of
hadronization. The slow cooling mechanism also leads to a significant
enhancement of photon yield in comparison with Bjorken scenario.
