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- Mittal, Nitesh, et al.
(författare)
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Numerical Simulation of Mixed-Convection Flow in a Lid-Driven Porous Cavity Using Different Nanofluids
- 2014
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Ingår i: Heat Transfer-Asian Research. - : Wiley Periodicals. - 1099-2871 .- 1523-1496. ; 43:1, s. 1-16
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Tidskriftsartikel (refereegranskat)abstract
- In this study, the effect of mixed convection flow in a lid-driven porous cavity using different nanoparticles, such as aluminum oxide (Al 2 O 3), copper (Cu), silver (Ag), and titanium dioxide (TiO 2), are investigated. The base fluid is considered as water. The transport equations are solved numerically by finite volume method on a co-located grid arrangement using quadratic upwind interpolation for convective kinematics (QUICK) scheme. A two-dimensional square cavity is considered for the present investigation whose horizontal walls are insulated. The cold left wall is moving up and hot right wall is moving down with equal velocities. The variations of temperature distribution, stream function, and Nusselt number (Nu) are analyzed at constant Grashof numbers (Gr), Richardson numbers (Ri), and Darcy numbers (Da) as 1 × 10 4, 100, and 0.1, respectively, for different nanoparticles. The present results are validated by favorable comparison with previously published literature. The predicted results clearly indicate that the presence of nanoparticles inside the porous media enhances the heat transfer significantly. It is observed from the numerical results that the average Nusselt numbers (Nu) were found to increase linearly with an increase in volume fraction (χ). For the given volume fraction, the average Nu is maximum for a silver-based nanoparticle.
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| 2. |
- Mittal, Nitesh, et al.
(författare)
-
Numerical simulation of mixed convection in a porous medium filled with water/Al2 O3 nanofluid
- 2013
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Ingår i: Heat Transfer-Asian Research. - : Wiley Periodicals. - 1099-2871 .- 1523-1496. ; 42:1, s. 46-59
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Tidskriftsartikel (refereegranskat)abstract
- The present work encloses the application of a Brinkman-extended Darcy model in a problem concerning mixed convection ina lid-driven porous cavity using nanofluids. The transport equations are solved numerically by the finite volume method on a co-located grid arrangement using the Quadratic Upstream Interpolation for Convective Kinematics (QUICK) scheme. The effects of governing parameters, namely, Grashof number (Gr), Darcy number (Da), and solid volume fraction $(\chi)$, on the streamlines and the isotherms are studied. The present results are validated by favorable comparisons with previously published results and are in good agreement with them. The present numerical results show that the addition of nanoparticles to a base fluid has produced an augmentation of the heat transfer coefficient and it is found to increase significantly with an increase of the particle volume concentration. It is observed from the results that at the higher value of the Grashof number (Gr = 104), the average Nusselt number increases with an increase in the Darcy number for a constant solid volume fraction. The detailed results are reported by means of streamlines, isotherms, and Nusselt numbers
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