Investigations into mixing of fluids in microchannels with lateral obstructions
| Autor: | Ashis Kumar Sen, Pankaj Kumar Sahu, Aakash Golia |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Work (thermodynamics)
Mathematical optimization Staggered arrangement Materials science Parametric study Micromixer Efficiency Momentum symbols.namesake Mixing Mixers (machinery) Electrical and Electronic Engineering Diffusion (business) Passive micromixer Pressure drop Mixing performance Mixing (physics) Diffusion equations Microchannel Operational parameters Reynolds number Mechanics Condensed Matter Physics Critical Reynolds number Partial differential equations Mixing efficiency Electronic Optical and Magnetic Materials Microchannels Hardware and Architecture symbols |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| Popis: | This work presents a study of a passive micromixer with lateral obstructions along a microchannel. The mixing process is simulated by solving the continuity, momentum and diffusion equations. The mixing performance is quantified in terms of a parameter called ‘mixing efficiency’. A comparison of mixing efficiencies with and without obstructions clearly indicates the benefit of having obstructions along the microchannel. The numerical model was validated by comparing simulation results with experimental results for a micromixer. An extensive parametric study was carried out to investigate the influence of the geometrical and operational parameters in terms of the mixing efficiency and pressure drop, which are two important criteria for the design of micromixers. A very interesting observation reveals that there exists a critical Reynolds number (Re cr ~ 100) below which the mixing process is diffusion dominated and thus the mixing efficiency is reduced with increase in Re and above which the mixing process is advection dominated and mixing efficiency increases with increase in Re. Microchannels with symmetric and staggered protrusion arrangements were studied and compared. The mixing performance of the staggered arrangement was comparable with that of symmetric arrangement but the pressure drop was lower in the case of staggered arrangements making it more suitable. |
| Databáze: | OpenAIRE |
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