Free convection of a nanofluid in a square cavity with a heat source on the bottom wall and partially cooled from sides

Abstract

The problem of free convection fluid flow and heat transfer in a square cavity with a flush mounted heat source on its bottom wall and two heat sinks on its vertical side walls has been investigated numerically. Via changing the location of the heat sinks, six different arrangements have been generated. The cavity was filled with Cu-water nanofluid. The governing equations were discretized using the finite volume method and SIMPLER algorithm. Using the developed code, a parametric study was undertaken, and effects of Rayleigh number, arrangements of the heat sinks and volume fraction of the nanoparticles on fluid flow and heat transfer inside the cavity were investigated. Also for the middle-middle heat sinks arrangement, capability of five different water based nanofluids on enhancement of the rate of heat transfer was examined and compared. From the obtained results it was found that the average Nusselt number, for all six different arrangements of the heat sinks, was an increasing function of the Rayleigh number and the volume fraction of the nanoparticles. Also it was found that at high Rayleigh numbers, maximum and minimum average Nusselt number occurred for middlemiddle and top-bottom arrangement, respectively. Moreover it was found that for the middle-middle arrangement, at high Rayleigh numbers, maximum and minimum rate of heat transfer was obtained by Cu-water and TiO 2 -water nanofluids, respectively.

Unicellular unsteady Rayleigh–Bénard convection in Newtonian liquids and Newtonian nanoliquids occupying enclosures : New findings

“…This new model will henceforth be called as "Generalized Boungiorno two-phase model" (see Siddheshwar et al [17]). Most of the studies on natural convection of nanoliquids in an enclosure that make use of either single-phase or two-phase model generally address the problem of heating and cooling from the vertical plates with the horizontal plate kept adiabatic ( [2], [18], [19], [20], [21], [22], [23]). Very sparse literature is available on Rayleigh-Bénard convection in an enclosure that involves heating and cooling of the horizontal boundaries with the vertical boundaries maintained adiabatic( [24], [3], [25], [26], [27]).…”

Computational study of laminar free convection inside tilting irregular cavity of a batch-type solar collector

“…1, one would be hardpressed to find the literature of relevance. Notable experimental and numerical convective heattransfer studies in rectangular cavities are Catton and Edwards [2], Catton [3], Hollands et al [4][5], Ganzarolli and Milanez [6], Aydin [7], Sezai and Mohamad [8], Corcione [9], Sharif and Mohammad [10], Mahdavi et al [11], Mehmoodi et al [30], Mendu et al [31], and Sourtiji and Hosseinizadeh. [32].…”

Comparison study of CFD and artificial neural networks in predicting temperature fields induced by natural convention in a square enclosure

“…Das, et al [3] published a review about this scientific issue, they summarized the previous researches on natural convection heat transfer in an enclosure filled with fluid or porous media, including triangular, trapezoidal, parallelogrammic, or have an irregular shape with curved and wavy walls. Most of the studies about the natural convection in an enclosure with a heat source on the bottom were conducted numerically using the finite volume method and SIMPLER algorithm [4,5]. Minea [6] preferred numerical analysis in the investigation of the natural convection in a heated closed enclosure.…”