LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Effect of heat source aspect ratio on turbulent thermal stratification in a naturally ventilated enclosure

Photo from wikipedia

Abstract The turbulent buoyant flows generated from a heat source block in a naturally ventilated cubical enclosure with vertical and horizontal openings are numerically investigated. Turbulence is modeled with large… Click to show full abstract

Abstract The turbulent buoyant flows generated from a heat source block in a naturally ventilated cubical enclosure with vertical and horizontal openings are numerically investigated. Turbulence is modeled with large eddy simulation (LES) and the filtered governing equations are solved using an in-house code based on finite difference method (FDM). The time dependent flow characteristics are analyzed by varying the heat source aspect ratio (ϕ) in the range 0.25 ≤ ϕ ≤ 4.0 and the Grashof numbers (Gr) are varied between 107 ≤ Gr ≤ 1011. A chaotic flow behavior is observed inside the enclosure and the bidirectional exchange across the openings increases linearly with Grashof number. The results indicate that the heat source aspect ratio significantly impacts the thermal buoyancy force with the formation of multi-recirculating vortex cells inside the enclosure. A significant enhancement in the heat transfer rate and mass flow rates are observed after increasing the heat source aspect ratio. The results also indicate that the flow instabilities that develop across the vertical opening exceeded those across the horizontal opening. The present numerical results are in good agreement with the benchmark results reported in literature.

Keywords: aspect ratio; heat source; heat; source aspect; enclosure

Journal Title: Building and Environment
Year Published: 2018

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.