A numerical investigation on the heat transfer characteristics of nanofluid flow in a three-dimensional microchannel with harmonic rotating vortex generators
| Autor: | Ehsan Izadpanah, S. Akhavan, Y. Amini |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Microchannel Reynolds number 02 engineering and technology Mechanics Vortex generator 021001 nanoscience & nanotechnology Condensed Matter Physics Rotation 01 natural sciences Nusselt number 010406 physical chemistry 0104 chemical sciences Physics::Fluid Dynamics symbols.namesake Nanofluid Heat transfer Fanning friction factor symbols Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 139:755-764 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | Three-dimensional numerical simulation of conjugate heat transfer in a microchannel involving harmonic rotating longitudinal vortex generators is performed. The Al2O3–water nanofluid with concentration of 0.5% of volume fraction is used. The mean diameter of particles is 29 nm. The Nusselt number and Fanning friction factor of the microchannel changes are investigated for different Reynolds numbers, rotation frequency, and rotation’s direction. Results show that time variations of Nusselt number and friction factor are periodic and their frequencies are the same as vortex generator’s rotation frequencies. It was observed that the amplitude of Nusselt number increases with increasing Reynolds number. Furthermore, when all the vortex generators are rotating in the same direction, the amplitudes of Nusselt number and friction factor are higher than when they are rotating in opposite directions. |
| Databáze: | OpenAIRE |
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