Improving the mixing quality in a passive micromixer using the optimal location of obstacles with fuzzy data

Micromixers play a very important role in microfluidic science. These tools are widely used in various fields such as medicine, food industry, nuclear and chemical industries. Achieving high mixing quality in these mixers is very importance. There are two general methods for increasing لاthe quality of mixing in micromixers: Active methods, which use external factors such as electric and magnetic fields to increase the quality of mixing, and Passive methods, which do not use external forces and energy and only By using structural changes of micromixers, they improve the quality of mixing. Passive methods are very popular due to their low current cost and lack of use of moving parts. Creating obstacles in the path of fluid stream is one of these methods. In this paper, a micromixer with a rectangular geometry is considered, which tries to increase the mixing quality by using circular barriers. To consider these obstacles, five points have been considered, in which circular obstacles with five different diameters are placed. It is worth mentioning that the present study includes numerical modeling and due to the uncertainty in the obtained numerical results, modeling in fuzzy space can achieve more desirable results. The innovation of the work is to provide a way to optimally locate the obstacles with fuzzy data, based on which the arrangement of different obstacles in the micromixer can be achieved in such a way that the highest mixing quality is achieved. The results show that elements with diameters of 0.20, 0.15, 0.25, 0.30 and 0.10 mm should be placed in left-to-right arrangement in five designated positions. With this combination, the mixing quality increases by 467% compared to the base state.