Thermohydraulic performance augmentation in a solar air heater using a perforated circular segment vortex generator

Hap, Nguyen Van; Nhan, Phan Thanh; Hien, Huynh Phuoc; Phu, Nguyen Minh

doi:10.1007/s11356-023-26987-2

Environ Sci Pollut Res

2023

DOI: 10.1007/s11356-023-26987-2

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Thermohydraulic performance augmentation in a solar air heater using a perforated circular segment vortex generator

Nguyen Van Hap

Phan Thanh Nhan

Huynh Phuoc Hien

et al.

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Cited by 2 publications

References 33 publications

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Numerical and experimental investigations of thermohydraulic performance enhancement of triangular duct solar air heaters using circular wing vortex generators

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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This study presents the thermohydraulic performance enhancement in a triangular duct solar air heater (TSAH) using circular wing vortex generators (CWVGs) on the absorber plate using computational fluid dynamics (CFD) methodology for the Reynolds number (Re) range of 6000–21,000. The use of wing vortex generators offers relatively lower interference with the core flow region, while the circular geometry offers a smooth curved edge, which reduces multiple vortex interactions in the wake region, thereby limiting the pressure drop. This study explores the impact of flow attack angle, longitudinal pitch, transverse pitch, and diameter of CWVG on the thermohydraulic performance of TSAH. The results reveal that a lower flow attack angle exhibits enhanced heat transfer with a lower friction factor penalty. The nondimensional diameter greater than d/Dh = 0.325 tends to limit heat transfer and exhibits an increased friction factor. The transverse pitch parameter also exhibits a similar trend where the threshold nondimensional pitch is found to be 1.5. The highest improvement in Nu is 4.37 times that of smooth duct for d/Dh = 0.433, Pl/d = 1, Pt/d = 1.5 and α = 20° at Re = 6000. The highest rise in friction factor is about 10.23 times that of smooth duct for d/Dh = 0.433, Pl/d = 1.0, Pt/d = 1.5, and α = 20° at Re = 21,000. The highest thermohydraulic performance parameter (THPP) value is about 2.23 at Re = 6000, with THPP values ranging from 1.69 to 2.23 across different CWVG configurations. Finally, mathematical correlations are developed for Nu and friction factors which are in close agreement with CFD results, with deviations averaging 5.03% and 3.69%, respectively.

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Numerical and experimental investigations of thermohydraulic performance enhancement of triangular duct solar air heaters using circular wing vortex generators

Pramod,

Madhwesh,

Arunachala

et al. 2024

Heat Trans

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Energy and enviro-economic analysis of a solar air heater with wedge turbulators

Balakrishnan,

Vengadesan,

Bhowal

et al. 2023

Environ Sci Pollut Res

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Thermohydraulic performance augmentation in a solar air heater using a perforated circular segment vortex generator

Cited by 2 publications

References 33 publications

Numerical and experimental investigations of thermohydraulic performance enhancement of triangular duct solar air heaters using circular wing vortex generators

Numerical and experimental investigations of thermohydraulic performance enhancement of triangular duct solar air heaters using circular wing vortex generators

Energy and enviro-economic analysis of a solar air heater with wedge turbulators

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