Fabrication of Tree Type Micro-Mixer with Circular Baffles Using CO₂ Laser Machining

Micro-mixer is a device which is used to carry the mixing of two or more than two fluids. Any one dimension of it is in micrometer. Due to low Reynolds’ Number Micro-mixer design is challenge for the designers. To address this challenge, novel methods of mixing enhancement within micro-fluidic devices have been explored for a variety of applications. For Passive Micro-mixer mixing will be carried out with the help of geometry of the micro-mixer. In this study fabrication of a tree type Micro-mixer with Circular baffles using CO₂ Laser machining is discussed. The Circular baffles are responsible for making diversion of flow of the fluid in Convergent & Divergent manner due to which proper mixing of fluids become possible. This type of micro-mixer is suitable for Bio-medical applications such as Urine testing, Blood testing, in preparation & in testing of Drugs. This paper focuses on design and fabrication of tree type Micro-mixer with Circular Baffles. The parametric study for CO₂ laser machining by considering the speed and power as the control parameters and the depth as a performance measure for engraving different width micro channels is presented in this paper. The tree type Micro-mixer with Circular Baffles fabricated by CO₂ laser machining is found to be suitable for master molds used in soft lithography process.