Abstract
This work present numerical simulation results of mixed convection in lid-driven “T” shallow cavity, filled by two immiscible fluids layers of air and Al2O3-water nanofluid. Mixed convection condition is created by the upper wall movement and temperature difference between the alveolus bottom and upper wall. Hydrodynamic and thermal characteristics of the flow have been predicted by solving the Navier- Stokes and energy equation using finite volume method. Coupling between two fluids layers are achieved using continuity of temperature and velocity at the interface air-nanofluid. Nano-particle volume fraction effect and geometrical shape of alveolus sidewalls (plane shape, concave shape and convex shape) have been chosen as discussed parameters. Analysis of obtained results shows that the heat transfer rate decreased with increasing volume fraction of solid inside the nanofluid layer. In addition, geometrical shape of alveolus sidewalls has a poor effect on flow structure and isotherms distribution in the physical domain.
Highlights
Mixed convection in the presence of two confined fluids has many industrial applications, we find this phenomenon present in the cooling processes of dualfuel engines, and in cooling processes of nuclear power plants, the building with a specific problem... etc. this phenomenon has been studied by many scientific researches
Many parameters have been taken; the results of this study showed that the highest values of the volume fractions of nanoparticles increases heat transfer. this conclusion on the presence of solid nanoparticles within base fluid has been confirmed in a semi-wave channel geometry by [10], at the existence of two layers of fluid
It is interesting to note that as the solid volume fraction increases, we notice that the average Nusselt number decreases, and this has been observed in all cases of geometrical shape of alveolus sidewalls
Summary
Mixed convection in the presence of two confined fluids has many industrial applications, we find this phenomenon present in the cooling processes of dualfuel engines, and in cooling processes of nuclear power plants, the building with a specific problem... etc. this phenomenon has been studied by many scientific researches. The notion of nanofluid is appeared, with the objective to improve heat transfer in industrials systems In this context, various numerical research has been conducted. This conclusion on the presence of solid nanoparticles within base fluid has been confirmed in a semi-wave channel geometry by [10], at the existence of two layers of fluid Their investigation is based on the injection of nanoparticles into one of the two fluids, in order to study their impact on the heat transfer process in a channel. T 2 Tc Th Tc that there is little work dealing with mixed convection in flows of two immiscible fluids with the presence of solid Dimensionless parameters defined in (1), can be used to nanoparticles. A study follows: was carried out on the effect of solid volume fraction and geometrical shape of sidewalls of the upper part of cavity (alveolus)
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