High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers
In a recent study, the Two-Layer Crossing Channels Micromixer (TLCCM) exhibited good mixing capacities in the case of the Newtonian fluids (close to 100%) for all considered Reynolds number values. However, since the majority of the used fluids in the industrial sectors are non-Newtonians, this work...
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| Format: | Article |
| Language: | English |
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Universiti Malaysia Pahang Publishing
2019-12-01
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| Series: | Journal of Mechanical Engineering and Sciences |
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| Online Access: | https://journal.ump.edu.my/jmes/article/view/2294 |
| _version_ | 1797699309503774720 |
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| author | A. Kouadri Y. Lasbet M. Makhlouf |
| author_facet | A. Kouadri Y. Lasbet M. Makhlouf |
| author_sort | A. Kouadri |
| collection | DOAJ |
| description | In a recent study, the Two-Layer Crossing Channels Micromixer (TLCCM) exhibited good mixing capacities in the case of the Newtonian fluids (close to 100%) for all considered Reynolds number values. However, since the majority of the used fluids in the industrial sectors are non-Newtonians, this work details the mixing evolution of power-law fluids in the considered geometry. In this paper, the power-law index ranges from 0.73 to 1 and the generalized Reynolds number is bounded between 0.1 and 50. The conservation equations of momentum, mass and species transport are numerically solved using a CFD code, considering the species transport model. The flow structure at the cross-sectional planes of our micromixer was studied using the dynamic systems theory. The evolutions of the intensity, also the axial, radial and tangential velocity profiles were examined for different values of the Reynolds number and the power-law index. Besides, the pressure drop of the power-law fluids under different Reynolds number was calculated and represented. Furthermore, the mixing efficiency is evaluated by the computation of the mixing index (MI), based on the standard deviation of the mass fraction in different cross-sections. In such geometry, a perfect mixing is achieved with MI closed to 99.47 %, at very small Reynolds number (from the value 0.1) whatever the power-law index and generalized Reynolds numbers taken in this investigation. Consequently, the targeted channel presents a useful tool for pertinent mass transfer improvements, it is highly recommended to include it in various microfluidic systems. |
| first_indexed | 2024-03-12T04:06:06Z |
| format | Article |
| id | doaj.art-cde9d78438b846209ea69eef59a6c633 |
| institution | Directory Open Access Journal |
| issn | 2289-4659 2231-8380 |
| language | English |
| last_indexed | 2024-03-12T04:06:06Z |
| publishDate | 2019-12-01 |
| publisher | Universiti Malaysia Pahang Publishing |
| record_format | Article |
| series | Journal of Mechanical Engineering and Sciences |
| spelling | doaj.art-cde9d78438b846209ea69eef59a6c6332023-09-03T11:17:39ZengUniversiti Malaysia Pahang PublishingJournal of Mechanical Engineering and Sciences2289-46592231-83802019-12-011345938596010.15282/jmes.13.4.2019.15.0471High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbersA. Kouadri 0Y. Lasbet 1M. Makhlouf2Department of Mechanical Engineering, Djillali Liabes University, 22000 Sidi Bel Abbes, AlgeriaLDMM Laboratory, Djelfa University, 17000 Djelfa, AlgeriaDepartment of Mechanical Engineering, Djillali Liabes University, 22000 Sidi Bel Abbes, AlgeriaIn a recent study, the Two-Layer Crossing Channels Micromixer (TLCCM) exhibited good mixing capacities in the case of the Newtonian fluids (close to 100%) for all considered Reynolds number values. However, since the majority of the used fluids in the industrial sectors are non-Newtonians, this work details the mixing evolution of power-law fluids in the considered geometry. In this paper, the power-law index ranges from 0.73 to 1 and the generalized Reynolds number is bounded between 0.1 and 50. The conservation equations of momentum, mass and species transport are numerically solved using a CFD code, considering the species transport model. The flow structure at the cross-sectional planes of our micromixer was studied using the dynamic systems theory. The evolutions of the intensity, also the axial, radial and tangential velocity profiles were examined for different values of the Reynolds number and the power-law index. Besides, the pressure drop of the power-law fluids under different Reynolds number was calculated and represented. Furthermore, the mixing efficiency is evaluated by the computation of the mixing index (MI), based on the standard deviation of the mass fraction in different cross-sections. In such geometry, a perfect mixing is achieved with MI closed to 99.47 %, at very small Reynolds number (from the value 0.1) whatever the power-law index and generalized Reynolds numbers taken in this investigation. Consequently, the targeted channel presents a useful tool for pertinent mass transfer improvements, it is highly recommended to include it in various microfluidic systems.https://journal.ump.edu.my/jmes/article/view/2294micromixerchaotic advectionmixing indexshear-thinning fluidslow reynolds number |
| spellingShingle | A. Kouadri Y. Lasbet M. Makhlouf High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers Journal of Mechanical Engineering and Sciences micromixer chaotic advection mixing index shear-thinning fluids low reynolds number |
| title | High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers |
| title_full | High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers |
| title_fullStr | High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers |
| title_full_unstemmed | High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers |
| title_short | High mixing performances of shear-thinning fluids in two-layer crossing channels micromixer at very low Reynolds numbers |
| title_sort | high mixing performances of shear thinning fluids in two layer crossing channels micromixer at very low reynolds numbers |
| topic | micromixer chaotic advection mixing index shear-thinning fluids low reynolds number |
| url | https://journal.ump.edu.my/jmes/article/view/2294 |
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