A review on roughness geometry used in solar air heaters

By Varun, R. Saini, S. K. Singal. 2007

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Enhanced heat transfer in a triangular ribbed channel with longitudinal vortex generators (2010, unknown): “[14] and Han et al.”
Multi-objective optimization of solar air heater with obstacles on absorber plate (2015, methodology): “Numerous methods to enhance heat transfer in SAHs are described in the literature (Varun et al., 2007; Wazed et al., 2010; Akpinar and Kocyig it, 2010; El-Sebaii et al., 2011; Omojara and Aldabbagh, 2010; Alta et al., 2010).”
Development of correlations for Nusselt number and friction factor for solar air heater with roughened duct having arc-shaped wire as artificial roughness (2008, methodology): “010 E investigators have established this aspect ratio to be optimum (Varun et al., 2007).”
Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates (2010, background): “The SAH occupies an important place among solar heating system because of minimal use of materials and cost [1,2].”