Large Eddy Simulation of turbulent buoyancy-driven flow with alternating staggered heating walls. (5th October 2015)

• Record Type: Journal Article
• Authors: Li, W.; Yeoh, G.H.; Timchenko, V.
• Is Part Of: Applied thermal engineering. Volume 89(2015:Oct.)
• Page Start: 558
• Page End: 568
• Publication Date: 2015-10-05
• Subjects: Large eddy simulation -- Turbulent buoyancy-driven flow -- Staggered arrangement -- Vertical configuration -- Tilted configuration; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2015.06.038
• Languages: English
• ISSNs: 1359-4311

Abstract

Abstract: Unsteady turbulent natural convection flow and heat transfer in an open-ended channel with non-uniformly heated walls has been investigated. A two-wall-heated staggered arrangement in both vertical and tilted (45°) flow channels is analyzed to better understand the mechanism of perturbing the developing fluid and thermal boundary layers along the heated walls. Effect of different convective fluxes and fixed air gap distances on velocity and temperature fields is investigated. Large Eddy Simulation (LES) results demonstrate that better cooling enhancement is achieved in the two-wall-heated staggered arrangement with a higher chimney effect being experienced in the vertical configuration. Highlights: Turbulent natural convection flow in a channel with non-uniformly heated walls is studied. Two-wall-heated staggered arrangement in both vertical and tilted flow channels is analysed. Large Eddy Simulation demonstrates that vertical flow channel has a higher chimney effect. Two-wall-heated staggered arrangement results in higher volumetric flow rate of entrained air.