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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

LAYOUT OPTIMIZATION OF PASSIVE MICRO MIXERS WITH CYLINDRICAL OBSTACLES

Get access (open in a dialog) DOI: 10.1615/IHTC16.bma.021811
pages 495-503

Résumé

Lab-on-a-chip applications have necessitated the optimal design of the micro mixer, which is an important component of micro fluidic systems. Reynolds numbers in such micro mixers are generally low and the turbulent fluctuations evident in macro channels are not observed. Therefore, an effective design is essential for the optimal design of micro mixers. Passive micro mixer design is of pivotal importance in the field of chemical and aerospace engineering. Passive micro mixer makes use of internal obstacle that creates chaotic advection enhancing the mixing. Various such micro mixer designs were tested in the past. In the present work, optimization of well-known passive micro mixer with cylindrical obstacles is considered. A numerical model is developed using Comsol multiphysics to analyze a Micro mixer with size of the obstacle to height of channel in the range of 0.1<h/D<0.9 with a velocity of range 0.00001m/s to 0.0017m/s. A layout to achieve enhanced mixing is found along with a holistic approach to minimize the pressure drop in addition to the mixing efficiency. In the present work an attempt has been made by using finite element modeling in which coupled momentum and species conservation equation are solved to arrive at the best geometry and a layout to achieve enhanced mixing with reduced pressure drop. The evaluated optimal design can henceforth be used by designers to arrive at optimized layouts for obstacle holding passive micro mixers.