This paper present detailed experimental results of a vaporizing spray produced by a pressure atomizer in a coflowing air stream inside a constant section lean premixer prevaporizer tube. This study is part of an ongoing effort to understand the behavior of spray under a variety of conditions. PDPA was used to characterize the atomization and vaporization process. The evolution of the two phase flow at each section was assessed in terms of global spray behavior and spray dynamics. The results confirm the influence of fuel injector on size distribution also the relative velocity between gas and dispersed phase on secondary atomization, and finally the complex spray structure in terms of wall proximity.