 CFD investigation on roughness pitch variation in non-uniform cross-section transverse rib roughness on Nusselt number and friction factor characteristics of solar air heater ductAmritpal Singh and Sukhmeet Singh Energy, 2017, vol. 128, issue C, 109-127 Abstract: In the present study, solar air heater duct roughened with non-uniform cross-section saw tooth rib has been numerically investigated for Nusselt number and friction factor. The investigation has been carried in 3-D with computational fluid dynamics software. The parameters, Reynolds number and relative roughness pitch ranged from 3000 to 15000 and 4 to 30 respectively. The relative roughness height and saw-tooth angle were 0.043 and 45° respectively. The renormalization group (RNG) k-ε turbulence model was selected for analysis. At relative roughness pitch of 16, both the Nusselt number and friction factor were maximum for the investigated Reynolds number range. The contours of turbulent dissipation rate, turbulent kinetic energy, static temperature and static pressure have also been plotted. The maximum Nusselt number and friction factor enhancement over smooth duct was 2.18 and 3.34 respectively at Reynolds number of 15000 and relative roughness pitch of 16. Keywords: Saw-tooth rib; Heat transfer; Reynolds number; Turbulence models; Turbulent kinetic energy; Static temperature (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:128:y:2017:i:c:p:109-127 DOI: 10.1016/j.energy.2017.04.008 Access Statistics for this article Energy is currently edited by Henrik Lund and Mark J. Kaiser More articles in Energy from Elsevier |
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