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Recent experimental investigations and physical modeling studies have indicated that turbulence behaviors within a liquid jet have considerable effects on the atomivtion process. This study aims to model the turbulence effect in the atomization pmcess of a cylindrical liquid jet. Two widely used models, the KelvinHelmholtz (KH) instability of Reitz (blob model) and the Taylor-Analogy-Breakup ("AB) secondary droplet breakup by O'Rourke et d , are further extended to include turbulence effects. In the primary breakup model, the level of the turbulence effect on the liquid breakup depends on the characteristic scales and the initial flow conditions. For the secondary breakup, an additional turbulence force acted on parent drops is modeled and integrated into the TAB governing equation. The drop size formed from this breakup regime is estimated based on the energy balance before and after the breakup occurrence. This paper describes theoretical development of the current models, called "T-blob" and "T-TM", for primary and secondary breakup respectivety. Several assessment studies are ais0 presented in this paper. Nomenclature

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