This paper presents a three-dimensional combustion model in the micro-combustors. In this research, the flame structure is composed of three zones: a preheat zone, a reaction zone and finally a post-flame zone. The governing equations are solved in these zones using the required boundary and matching conditions which are achieved from non-asymptotic or asymptotic approach. Moreover, the role of Peclet number as a determining factor in the micro-combustors performance is analyzed, and is found that by the increase of the Peclet number the dimensionless flame temperature rises. Consequently, this three -dimensional model has provided a great description for the Peclet number, dimensions, asymptotic or non-asymptotic assumption effects and the structural heat conduction in the micro-combustors. The results are validated with those obtained from two dimensional heat transfers modeling, and are in accordance with data published by former researchers.

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