Effect of Ribs Configurations on Heat Transfer Enhancement for W-Shaped Ribs in a Square Duct

Gajghate, Sameer Sheshrao; Deshpande, Onkar Prakash; Desai, Amit Uttam; Deshmukh, Akshay Dilip; Kharade, Shrikant Uttam; Pal, Sagnik; Cardoso, Elaine Maria; Saha, Bidyut Baran; Bhaumik, Swapan

doi:10.1007/s13369-023-07662-7

Cited by 3 publications

(1 citation statement)

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“…Thus, the flow accelerates near the rib regions, which leads to enhancing fluid mixing [32]. Due to 180 °bend and the divider wall, the stronger secondary flows are generated around the bend area of the smooth and ribbed channels.…”

Section: Impact Of P/e On the Thermohydraulic Characteristicsmentioning

confidence: 99%

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: Impact Of P/e On the Thermohydraulic Characteristicsmentioning

confidence: 99%