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Optimization of grooved micromixer for microengineering technologies
Sabotin, Izidor (Author), Tristo, Gianluca (Author), Bissacco, Giuliano (Author), Valentinčič, Joško (Author)

URLURL - Presentation file, Visit http://www.midem-drustvo.si/Journal%20papers/MIDEM_43(2013)1p3.pdf This link opens in a new window

Abstract
Due to the absence of turbulent flow and the slow diffusion process, mixing of solutions at micro-scale is a difficult task. This paper describes the optimization route towards the efficient design of a bottom grooved micromixer. Based on thoroughly discussed mixing mechanisms, the optimization was performed using FEM numerical simulations and the starting geometry was a Staggered Herringbone Mixer (SHM) groove design. Optimization procedure consists of two sequences: (I) one SHM groove geometry is optimized based on the magnitude of transversal velocity at the end of the groove and (II) different configurations of six grooves are investigated taking into account capabilities and limitations of microengineering technologies (MET ). Newly developed designs were benchmarked against the established SHM design and a better efficiency was achieved. Additionally, a good mixing efficiency was also achieved with a modified Slanted Groove Micromixer (SGM). A SGM prototype was machined by micro electrical discharge milling (EDM) technology. The simulation results were experimentally verified with flow visualization and a good agreement was observed. Due to simple 2.5D geometry and efficient mixing properties the proposed micromixer design is adequate to be used in the Lab-On- A-Chip (LOC) systems.

Language:English
Keywords:mikroinženirstvo, mikromešalniki, mikrostrukture, mikroobdelava, optimizacija, elektroerozija, mikro elektroerozijsko dolbenje, optimizacija, metoda končnih elementov, simulacije, microengineering, micromixers, microstructures, micromachining, optimization, EDM, micro electrical discharge milling, microfluidics, design optimization, FEM
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2013
Number of pages:str. 3-13
Numbering:Vol. 43, no. 1
UDC:621.9.048
ISSN on article:0352-9045
COBISS.SI-ID:13045019 Link is opened in a new window
Views:606
Downloads:206
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Record is a part of a journal

Title:Informacije MIDEM
Shortened title:Inf. MIDEM
Publisher:Strokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale
ISSN:0352-9045
COBISS.SI-ID:1220612 This link opens in a new window

Secondary language

Language:English
Title:Optimizacija mikromešalnika z utori za izdelavo z mikroinženirskimi tehnologijami
Abstract:
Mešanje dveh tekočin v mikrokanalih je zaradi odsotnosti turbolentnih tokov in počasnega procesa difuzije oteženo. V prispevku je predstavljen pristop k optimizaciji geometrije mikromešalnika z utori. Za izhodiščno geometrijo je bil izbran kljukasti utor (SHM utor). Optimizacija je bila izvedena s pomočjo numeričnega modeliranja z metodo končnih elementov, upoštevajoč temeljne mehanizme delovanja mikromešalnika z utori. Optimizacija je bila izvedena v dveh korakih. Najprej je bila optimizirana geometrija enega SHM utora glede na povprečno velikost komponente hitrosti prečno na mikrokanal takoj za utorom. Nato je bil raziskan vpliv geometrije različnih konfiguracij šestih utorov, kjer so bile upoštevane zmogljivosti in omejitve mikroinženirskih izdelovalnih tehnologij. Nov dizajn izkazuje boljšo učinkovitost mešanja v primerjavi z uveljavljenim dizajnom. Dobro učinkovitost mešanja izkazuje tudi geometrija mikromešalnika s poševnimi utori (SGM geometrija). Za namen verifikacije simulacij je bil izdelan prototip SGM geometrije s tehnologijo mikro elektroerozijskega dolbenja. Rezultati simulacij so bili eksperimentalno verificirani z metodo vizualizacije toka fluida in opaženo je bilo dobro ujemanje. Zaradi preproste 2.5D geometrije mikrostruktur in učinkovitosti mešanja je predlagan dizajn mikromešalnika primeren za uporabo v sistemih laboratorija na čipu (LOC).


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