Investigations into the generation of a unidirectional flow pattern by ultra-short pulse laser machining

This paper presents the initial findings of the investigation into the creation of a unidirectional flow pattern for precise control of flow dynamics. A three-step method was developed to test patterns for their dynamics based on the change in surface chemistry that results from direct processing of steel surfaces using ultrashort pulse lasers. In the initial phase of the process, the steel surfaces intended for processing were ablated with the corresponding patterns using an ultrashort pulse laser. Subsequently, molds were created using silicone. Finally, the structure was molded using a photopolymer. The initial successful patterns were identified as a function of the channel widths especially at a 200μm channel width, exhibiting predominantly unidirectional behavior. However, due to the absence of a clear trend in the patterns and especially the channel widths with respect to the flow direction, it is necessary to consider other external factors. Nevertheless, the preliminary results demonstrate significant potential for further investigation.