The natural convection inside a 3D triangular cross section cavity filled with nanofluid and included cylinder with different arrangements

Abstract

In this paper the laminar unsteady natural convection heat transfer of (Al2O3-water) nanofluid inside 3D triangular cross section cavity was investigated. The cavity was heated differentially, the vertical walls were kept at different constant temperatures. The left hot and the right cold. The effect of the solid volume fraction was examined for two values and compared with the pure water results. The (Ra) range studied was (103 ≤ Ra ≤ 106). Inserting cylindrical body inside the cavity also investigated in three cases. One concentric cylinder has radius (15%) of the cavity side length. The other cases were of two cylinders having radius (7.5%) of the cavity side length, aligned vertically or nonaligned. The results show that the higher solid volume fraction gives the maximum enhancement of the average (Nu) and this enhancement increases with (Ra) increase. For the cases with inner cylinders, the average (Nu) enhanced for the case of double cylinders over single cylinder. On other hand, the nonaligned position of the cylinders giving more enhancement than other position. As like as, the location of maximum horizontal or vertical velocities were varied with the cylinders position while (Ra) has no effect.

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

“…Many investigations have been conducted on free convection, [14][15][16][17][18]20,28 convection with nanofluid [29][30][31][32][33] as the medium material, or with MHD medium. 33,34 However, no study is available in the literature dealing with a combined effect of natural convection and radiation heat transfer from a vertical cylinder having annular fins.…”

Obstacle's effects and their location inside the square cavity on the thermal performance of Cu–Al2O3/H2O hybrid nanofluid

“…Ghoben and Hussein 26 examined in 3D the unstable natural convective heat transfer of a nanofluid Al 2 O 3 –H 2 O inside the cross‐section cavity. They considered that the vertical walls are at different constant temperatures.…”

Three‐dimensional numerical simulation of free convection and entropy generation in a cubic cavity containing a heat source

“…Among the recent interesting studies performed in 3D, we can mention the analysis of free convection in 3D geometries in the presence of heat sources, [6][7][8] porous media, 9,10 magnetic field, [11][12][13] and nanofluids. [14][15][16][17] Free convection simulations based on the lattice Boltzmann methodology are very abundant in the literature, especially in two dimensions. 18 However, the treatment of this type of problem in 3D in closed geometries containing obstacles with complex geometric shapes is limited.…”

“…However, 3D studies are preferable because they allow to visualize the physical phenomena well and draw accurate conclusions, especially for the simulation of asymmetric problems. Among the recent interesting studies performed in 3D, we can mention the analysis of free convection in 3D geometries in the presence of heat sources, 6–8 porous media, 9,10 magnetic field, 11–13 and nanofluids 14–17 …”