A review of artificial roughness geometries employed in solar air heaters. (September 2018)

• Record Type: Journal Article
• Authors: Singh, Inderjeet; Singh, Sukhmeet
• Is Part Of: Renewable & sustainable energy reviews. Volume 92(2018)
• Page Start: 405
• Page End: 425
• Publication Date: 2018-09
• Subjects: Solar air heater -- Artificial roughness -- Heat transfer -- CFD -- Reynolds number -- Thermohydraulic; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2018.04.108
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: Enhancement of heat transfer in the solar air heater ducts can be achieved by breaking laminar sub-layer near the absorbing surface and can be efficiently done by employing ribs as roughness elements. However, this gain is accomplished at the expense of increase in pressure drop. This paper presents the detailed review of various investigations made on artificial roughness geometries summarizing their outcomes. Attempt have been made to study the effect of various influencing roughness and flow parameters on the thermal and hydraulic performance of solar air heater through the flow visualization. Highlights: A comprehensive review of investigations made on artificial roughness geometries. The effect of various roughness and flow parameters has been presented. Heat and fluid flow phenomena has been visualized using streamlines. The outcomes and correlations reported in the investigations have been summarized.