Analysis of heat transfer and nanofluid fluid flow in microchannels with trapezoidal, rectangular and triangular shaped ribs
Autor: | Gholamreza Ahmadi Sheikh Shabani, Ali Marzban, Mohammad Reza Safaei, Majid Zarringhalam, Ali Behnampour, Ramin Mashayekhi, M B Ghavami, Omid Ali Akbari |
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Rok vydání: | 2017 |
Předmět: |
Finite volume method
Materials science 020209 energy Thermodynamics Laminar flow 02 engineering and technology Heat transfer coefficient Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Nusselt number Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Physics::Fluid Dynamics Nanofluid Heat flux Heat transfer 0202 electrical engineering electronic engineering information engineering Streamlines streaklines and pathlines 0210 nano-technology |
Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 91:15-31 |
ISSN: | 1386-9477 |
Popis: | In the present study, the effect of triangular, rectangular and trapezoidal ribs on the laminar heat transfer of water-Ag nanofluid in a ribbed triangular channel under a constant heat flux was numerically studied using finite volume method. Height and width of ribs have been assumed to be fixed in order to study the effect of different rib forms. Modeling were performed for laminar flow (Re=1, 50 and 100) and nanofluid volume fractions of 0, 2% and 4%. The results indicated that an increase in volume fraction of solid nanoparticle leads to convectional heat transfer coefficient enhancement of the cooling fluid, whereas increasing the Nusselt number results in a loss of friction coefficient and pressure. Also, along with the fluid velocity increment, there will be an optimal proportion between heat and hydrodynamic transfer behavior which optimizes performance evaluation criteria (PEC) behavior. Among all of the investigated rib forms, the rectangular one made the most changes in the streamlines and the triangular form has the best thermal performance evaluation criteria values. For all studied Reynold numbers, heat transfer values are least for rectangular rib from. Therefore, trapezoidal ribs are recommended in high Reynold numbers. |
Databáze: | OpenAIRE |
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