During the past two decades, thermal microfluidic chips have significantly been investigated. Due to their high capacity of heat transport, an increasing number of studies on different aspects of thermal microfluidic chips have been conducted.However, a comprehensive investigation on the geometry of microfluidic chips using state of the art finite element software is absent from the literature. In this thesis, geometric parameters of thermal microfluidic chips have been optimized, using finite element software. Consequently, micro and macro phenomena were