Investigation of nanofluids on heat transfer enhancement in a louvered microchannel with lattice Boltzmann method
| Autor: | Chun-Sheng Wang, Tong-Miin Liou, Tzu-Chiao Wei |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Microchannel
Materials science Convective heat transfer Heat transfer enhancement Lattice Boltzmann methods Laminar flow 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nusselt number 010406 physical chemistry 0104 chemical sciences Nanofluid Heat transfer Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 135:751-762 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-018-7299-3 |
| Popis: | Numerical studies of laminar forced convective heat transfer and fluid flow in a 2D louvered microchannel with Al2O3/water nanofluids are performed by the lattice Boltzmann method (LBM). Eight louvers are arranged in tandem within the single-pass microchannel. The Reynolds number based on channel hydraulic diameter and bulk mean velocity ranges from 100 to 400, where the Al2O3 fraction varies from 0 to 4%. A double distribution function approach is adopted for modeling fluid flow and heat transfer. Code validations are performed by comparing the streamwise Nusselt number (Nu) profiles and Fanning friction factors of the present LBM and those of the analytical solutions. Good agreements are obtained. Simulated results show that the louver microstructure can disturb the core flow and guide coolant toward the heated walls, thus enhancing the heat transfer significantly. Furthermore, the addition of nanoparticles in microchannels can also augment the heat transfer, but it creates an unnoticeable pressure loss. With both the louver microstructure and nanofluid, a maximum overall Nu enhancement of 7.06 is found relative to that of the fully developed smooth channel. |
| Databáze: | OpenAIRE |
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