Thermal enhancement by using grooves and ribs combined with delta-winglet vortex generator in a solar receiver heat exchanger

Lei Luo, Fengbo Wen, Lei Wang, Bengt Sundén and Songtao Wang

Applied Energy, 2016, vol. 183, issue C, 1317-1332

Abstract: A good heat transfer performance with moderate pressure drop penalty, as well as a high mixing effect contributes to the increase of a solar receiver thermal efficiency. In this study, delta-winglet vortex generators (DWVGs), and the combination of DWVGs and obstacles are numerically studied to reveal the effects on a solar receiver heat exchanger and the heat transfer, friction factor and mixing. The DWVGs are placed on the heated plate. Four different obstacles, i.e., perturbation triangular ribs, perturbation semi-cylinder ribs, triangular grooves and semi-cylinder grooves, are studied. The Reynolds number is ranging from 4000 to 40,000. Results of the flow field, heated plate Nu number, friction factor, temperature and turbulent kinetic energy (TKE) are included. A smooth channel with DWVGs is considered as the baseline. The results showed that the adoption of DWVGs induces pressure gradients on more than one direction and thus vortices are generated. The flow velocity is increased as the flow approaches the DWVGs. The perturbation semi-cylinder ribs provide the highest heat transfer augmentation as the vortex is disturbed by the smooth cylinder surface. The thermal performance indicates that the semi-cylinder grooves together with DWVGs provide the highest performance and also an augmented mixing effect is found.

Keywords: Solar receiver; Delta-winglet vortex generator; Rib; Groove; Thermal enhancement (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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DOI: 10.1016/j.apenergy.2016.09.077

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