Influence of stepped cylindrical turbulence generators on the thermal enhancement factor of a flat plate solar air heater

Antony, Albin; Shetty, Shreyas P.; Madhwesh, N; Sharma, Neha; Karanth, K. Vasudeva

doi:10.1016/j.solener.2020.01.065

Cited by 54 publications

(7 citation statements)

References 34 publications

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“…We also noted that the results obtained with the use of the cubic form are close to those found for spherical obstacles. It is important to assert that, for the same configuration, the same relative roughness pitch and for the same Reynolds number, the present study offers a good enhancement of the Nusselt number compared with results published in a previous paper [31].…”

Section: Validation Of Numericalsupporting

confidence: 68%

CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

Rouissi

Naili

Jarray

et al. 2021

Mathematical Problems in Engineering

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This work deals with a numerical parametric optimization study of a new Solar Flat Air Collector (SFAC) configuration. The CFD numerical parametric study investigates various SFAC structures inside the air cavity without obstacles and with spherical, cubic, cylindrical, and pyramidal obstacles. The study optimizes the most convenient configuration and arrangement that allow for the increase of the heat-transfer surface and to make the flow homogeneous in order to generate turbulence zones inside the SFAC air cavity. The result shows that the thermal performances of the cubic form are close to those of the spherical obstacles. Another set of simulations was performed to evaluate the performances of the cubic shape baffles for three orientation angles equal to 0°, 22.5°, and 45°, respectively. Each configuration has three forms of arrangement with a relative roughness pitch (b/a) varying between 2, 4, and 6. The results of the simulation study showed that the relative roughness pitch, the Reynolds number, as well as the angle of orientation influence the performance and the operation of the SFAC. The results of the simulations showed that the combination of an orientation of 45° with a roughness pitch of b/a = 2 increases the SFAC thermal performances, which can reach 85%.

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Section: Validation Of Numericalsupporting

confidence: 68%

CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

Rouissi

Naili

Jarray

et al. 2021

Mathematical Problems in Engineering

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“…The thermal enhancement factor (THEF) is calculated from the following expression [ 32 ]:

where Nu ref and f ref are the Nu and f of the reference case. In this study, the inline arrangement of case 1 is considered as the reference.…”

Section: Physical Model and Cases Consideredmentioning

confidence: 99%

The impact of tube bundle layout on the thermal and fluidic behaviour of liquid lead–bismuth eutectic in a helical-coiled once-through steam generator

Nuhash,

Karim,

Bhuiyan

2024

Heliyon

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“…Stepped cylindrical vortex generator 45 Diameter of 7 mm and a pitch ratio of 11.11 and Re = 18,000 1.49…”

Section: 33mentioning

confidence: 99%

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

Sankalp Shekar,

Nagaraj,

Mallashetty Shivamallaiah

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The influence of discretely placed sinewave corrugations on the effective thermal performance of the solar air heater system is presented using numerical methodology. The effect of forward and backward arrangement, normalised wavelength and amplitude on heat transfer enhancement is evaluated for different Reynolds number ranging between 6000 and 24,000. The non-dimensional wavelength and amplitude is varied as 0.0125–0.05 and 0.05–0.2 respectively while the non-dimensional pitch is taken as 1.875. The results show that the forward arrangement pattern of sinewave corrugation provides better thermo-hydraulic performance than the backward arrangement. For any given non-dimensional wavelength, lower non-dimensional amplitude exhibits greater thermal enhancement factor while for a fixed non-dimensional amplitude, the wavelength ratio of 0.025 provides greater thermal enhancement factor. The corrugation having amplitude ratio of 0.1 and wavelength ratio of 0.025 exhibits the highest thermal enhancement factor of 1.69 at Reynolds Number of 6000. It is also observed that, for Reynolds Number lesser than 9000, the configuration of amplitude ratio of 0.1 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength. However, for Reynolds Number greater than 9000, the configuration of amplitude ratio of 0.05 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength.

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Influence of stepped cylindrical turbulence generators on the thermal enhancement factor of a flat plate solar air heater

Cited by 54 publications

References 34 publications

CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

The impact of tube bundle layout on the thermal and fluidic behaviour of liquid lead–bismuth eutectic in a helical-coiled once-through steam generator

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

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