Numerical Analysis Of Mixing Under Low And High Frequency Pulsations At Serpentine Micromixers

• Authors: Ziemowit M. Malecha , Karol Malecha
• Languages of publication: EN

Abstracts

EN

The numerical investigation of the mixing process in complex geometry micromixers, as a function of various inlet conditions and various micromixer vibrations, was performed. The examined devices were two-dimensional (2D) and three-dimensional (3D) types of serpentine micromixers with two inlets. Entering fluids were perturbed with a wide range of the frequency (0 - 50 Hz) of pulsations. Additionally, mixing fluids also entered in the same or opposite phase of pulsations. The performed numerical calculations were 3D to capture the proximity of all the walls, which has a substantial influence on microchannel flow. The geometry of the 3D type serpentine micromixer corresponded to the physically existing device, characterised by excellent mixing properties but also a challenging production process (Malecha et al., 2009). It was shown that low-frequency perturbations could improve the average mixing efficiency of the 2D micromixer by only about 2% and additionally led to a disadvantageously non-uniform mixture quality in time. It was also shown that high-frequency mixing could level these fluctuations and more significantly improve the mixing quality. In the second part of the paper a faster and simplified method of evaluation of mixing quality was introduced. This method was based on calculating the length of the contact interface between mixing fluids. It was used to evaluate the 2D type serpentine micromixer performance under various types of vibrations and under a wide range of vibration frequencies.

Keywords

EN

Serpentine micromixer; active mixing; numerical simulations; LTCC technology

• Publisher: De Gruyter Open
• Journal: Chemical and Process Engineering
• Year: 2014
• Volume: 35
• Issue: 3
• Pages: 369-385

Dates

published

1 - 9 - 2014

received

1 - 1 - 2014

online

17 - 10 - 2014

accepted

20 - 7 - 2014

revised

24 - 4 - 2014

Contributors

author

Ziemowit M. Malecha

• University of New Hampshire, Program in Integrated Applied Mathematics, Durham, NH 03824, USA
• Wrocław University of Technology, Department of Cryogenic, Aviation and Process Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

Karol Malecha

• Wrocław University of Technology, Faculty of Microsystem Electronics and Photonics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

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Identifiers

DOI

10.2478/cpe-2014-0028