Investigation of thermal performance of a ribbed solar air heater for sustainable built environment

Agrawal, Yogesh; Bhagoria, J.L.; Gautam, Atul; Sharma, Abhishek; Yadav, Anil Singh; Alam, Tabish; Kumar, Rajan; Goga, Geetesh; Chakroborty, Subhendu; Kumar, Rahul

doi:10.1016/j.seta.2023.103288

Cited by 8 publications

(2 citation statements)

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“…Ribs of various shapes like rectangular, square, triangular, semicircular, circular, and elliptical are used to cool the blade. Agrawal et al [5][6][7][8] searched experimentally distinct discrete double-arc rib configurations with different arc angles of 30 °-75 °, a fixed rib height to hydraulic diameter ratio (e/D h = 0 027), and the rib pitch to height ratio (p/e = 6 67 − 11 67) at Reynolds number (Re) of 3000-14000. They noticed that an increase in Re led to a considerable enhancement in Nusselt number with a decrease of friction factor (f ).…”

Section: Introductionmentioning

confidence: 99%

“…They noticed that an increase in Re led to a considerable enhancement in Nusselt number with a decrease of friction factor (f ). Thermohydraulic performance (THP) reached the peak value for p/e = 8 33 at an arc angle of 60 ° [5][6][7][8]. Sahu et al [9] analyzed the impact of triangular, semicircular, and hybrid (the combination of triangular and semicircular) cross-section ribs on THP in a channel with aspect ratio (AR) of 4 : 1 and p/e = 6 6 − 53 3 at Re = 12640 − 52410.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the Thermohydraulic Performance in a Double Passage Square Duct with the Use of Inclined Ribs of 45°: A Comparative Computational Study

Kaplan

2024

International Journal of Energy Research

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The modern gas turbines need to run at very high inlet temperature to promote their power output. Thus, improvements in cooling technologies play a significant role for enhancing the gas turbine blade life. In this paper, thermohydraulic performance (THP) of a two-pass square channel with inclined ribs at 45° was scrutinized employing the k–ε realizable model with enhanced wall treatment in ANSYS Fluent. The calculations were performed for the rib pitch to height ratio (p/e) of 5-10, rib height to hydraulic diameter ratio (e/Dh) of 0.1-0.2, and Reynolds number (Re) of 20,000-40,000. Detailed analysis of the flow structure in a double passage square duct was carried out to understand the interaction of the rib and bend-induced secondary flows and its contribution to heat transfer enhancement for the rib configurations with distinct p/e and e/Dh, which was not available in any other existing numerical or experimental investigations. The results revealed that the ribs with higher e/Dh generated the stronger stream-wise secondary flows which led to the augmentation of the cooling performance with the disadvantage of pressure loss increment. The maximum THP of 26.55% was achieved with the ribbed configuration having p/e=5 and e/Dh=0.1 at Re=20,000. The new correlations were developed from the computational data to predict the normalized Nusselt number and friction factor (Nu/Nu0 and f/f0, where 0 is the correlation), taking the e/Dh and flow Re into consideration.

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Section: Introductionmentioning

confidence: 99%