Numerical calculations of the thermal-aerodynamic characteristics in a solar duct with multiple V-baffles

Engineering Applications of Computational Fluid Mechanics

Mahyar Ghazvini¹  Milad Sadeghzadeh²  Houari Ameur³  Mohammad Hossein Ahmadi⁴  Mohsen Sharifpur⁵  Younes Menni⁶ 

[1] Department of Ocean and Mechanical Engineering, Florida Atlantic University;Department of Renewable Energy and Environmental Engineering, University of Tehran;Department of Technology, University Centre of Naama (Ctr Univ Naama);Faculty of Mechanical Engineering, Shahrood University of Technology;Institute of Research and Development, Duy Tan University;Unit of Research on Materials and Renewable Energies, Department of Physics, Faculty of Sciences, Abou Bekr Belkaid University;

关键词: cfd;    solar heat exchangers;    air v-finned ducts;    recycling cells;    heat transfer;   

DOI  :  10.1080/19942060.2020.1815586

来源: DOAJ

【 摘 要 】

The study aimed to enhance the heat transport by improving the hydrodynamic structure of the system by changing and restructuring the duct's internal geometry. Modern fins, of the shape ‘V’, have been proposed with different dimensions, and they are periodically arranged over the duct surfaces. The most important steps of this research are the change in the V-fin attack-angle (40°–80°), length (Hb/2, 3Hb/4, Hb, 5Hb/4 and 3Hb/2), and separation length (Ds/2, 3Ds/4, Ds and 5Ds/4), as well as the flow rate (6 × 103–3 × 104). The study yielded an optimum case for a 40-degree attack-angle, with a factor of thermal enhancement of 2.163 for the highest value of Reynolds number. On the other hand, improving the length of the V-fins or decreasing in the space between them, increases the flow strength by enlarging the recycling cells, which reflects on the hydrodynamic behavior, and changes the heat transfer. The presence of this new model of fins also highlights a hydrothermal improvement ranging between 1.196 and 23.779 percent compared to the previously indicated models, reflecting the effectiveness of the new system of solar heat exchangers with air V-finned ducts.

【 授权许可】

Unknown