Experimental evaluation of hydrothermal performance of solar air heater with discrete roughened plate

Agrawal, Yogesh; Bhagoria, J.L.; Gautam, Atul; Chaurasiya, Prem Kumar; Dhanraj, Joshuva Arockia; Solomon, Jenoris Muthiya; Salyan, Srikanth

doi:10.1016/j.applthermaleng.2022.118379

Cited by 30 publications

(11 citation statements)

References 44 publications

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“…Multiple arc shaped roughness geometry shows the maximum enrichment in Nu and f with the ratio W/w as 5 and W/w as 7, respectively [23]. An experimental investigation was conducted with the use of novel discrete double arc reverse geometry [24] as well as a multiple arc with a gap [25] and a discrete multiple arc rib [26] revealing the behaviour of the flowing fluid.…”

Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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This study aims to investigate and compare the thermal performance of a solar air heater using a passive technique to enhance heat transfer between the absorber plate and the flowing fluid. The technique involves generating turbulence near the heat transferring surface through the use of artificial rib roughness. The study focuses on two different novel roughness geome-tries: full symmetrical arc rib roughness and half symmetrical arc rib roughness. By introducing additional gaps and varying the number of gaps in the roughness geometries, the study examines their effects on the solar air heaters thermal performance. The artificially roughened surface creates different turbulent zones, which are essential to the development of different types of turbulence in the vicinity of the heat transferring surface. The study finds that an optimal escalation in Nusselt number and friction factor by 2.36 and 3.45 times, respectively, occurs at certain gap numbers as 6 and ng as 5 for full symmetrical arc rib roughness. The maximum thermal-hydraulic performance parameter of 1.66 is attained at a Reynolds number of 6 000. The study also conducts correlation, mathematical modeling, and performance prediction under different operating circumstances.

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Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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“…Correlation development predicted value show variation of ±18% over experimental values. 30 Ansari et al optimized η th of ribbed roughened SAH by using genetic algorithm solution technique. To optimize roughness parameters mathematical code was developed and this code was validated by performing experiments.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic performance parameter based experimental investigation of frustum shaped roughened solar air heater

Singh,

Kumar

2024

Proceedings of the Institution of Mechanical Engineers, Part A:

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An outdoor experimental investigation was conducted to explore the thermohydraulic characteristic (Nusselt no. and friction factor) of artificial roughened solar air heater (ARSAH) having frustrum shaped roughened element on absorber plate. Data were recorded and further processed to generate Nusselt number and friction factor correlation to predict the effect of flow and roughness parameter on performance of ARSAH. The investigation was conducted by varying Reynolds number in range of 2500–12,500. Dimensionless parameter for Frustrum shaped roughness was relative frustum height (e/Dh) from 0.013 to 0.054, relative frustum pitch (p/e) from 8 to 14, Relative frustum height to base diameter (e/d1) from 0.37 to 0.75, relative frustum diametral ratio (d1/d2) from 1 to 3. Maximum performance for ARSAH was obtained corresponding to the optimum value of flow and geometric parameter. The geometric orientation of the proposed roughness geometry produced tremendous rise in Nu with an acceptable rise in friction (f). Maximum enhancement in Nu for varying p/e, e/Dh, e/d1, and d1/d2 was, 4.58, 5.21, 6.62 and 6.09 times and that of friction was 5.59, 4.69, 4.92 and 4.66 times respectively over conventional SAH. Maximum Thermohydraulic performance was 3.7, 3.6, 3.9 and 3.8 at p/e = 12, e/Dh = 0.054, e/d1 = 0.75 and d1/d2 = 3.

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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%

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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Experimental evaluation of hydrothermal performance of solar air heater with discrete roughened plate

Cited by 30 publications

References 44 publications

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Thermohydraulic performance parameter based experimental investigation of frustum shaped roughened solar air heater

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

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