Abstract
In this study, the mixed convection of nanofluid containing water as a base fluid and aluminum oxide as a nanoparticles in a lid-driven cavity including a hot elliptical centric cylinder is studied. The effects of a hot elliptical centric cylinder, cavity angle (α) and solid volume fraction (ϕ) of nanoparticles are investigated. The obtained results show that with increase of solid volume fraction and due to more condensation of nanofluid and more Brownian motion, the claustration phenomena occurred and resulting an increase of thermal conductivity and convection heat transfer coefficients (k, h) and heat transferred more from the higher temperature surface to the lower temperature wall. Also, heat transfer (q) and Nusselt number (Nu) increased due to the increase in the temperature difference (ΔT) between the hot cylinder and lower temperature surfaces at a constant cavity angle, solid volume fraction and Richardson number (Ri). By considering all diagrams, the highest value of nanofluid’s velocity was around the cap and right-side wall and the lowest velocity value was around the thermal cylinder and left side and down walls. The results show that the increase rate of the Nu from 0 to 45∘ in ϕ=0.1% and 0.2% and base fluid is equal to 1.7, 0.8 and 0.3 respectively.
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