Experimental and CFD-based thermal performance prediction of solar air heater provided with right-angle triangular rib as artificial roughness

Gawande, Vipin B.; Dhoble, Ashwinkumar S.; Zodpe, D. B.; Chamoli, Sunil

doi:10.1007/s40430-015-0391-8

Cited by 48 publications

(4 citation statements)

References 36 publications

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“…Table 3, lists the max value of Nu. 2.31 Arc shaped [79] 1.7 Square 2.73 Right-angle triangular [81] 3.1 equilateral triangular 3.073 Chamfered square [83] 3.214 Square [84] 2.86 Saw-tooth [85] 1.78 Circular [86] 2.31 Rectangular tapered [87] 2.56 Circular [88] 2.53 Saw tooth [89] 2.18 Semi-circular [90] 2.76 Triangular [91] 2.7 Forward chamfered [92] 2.88 Semi-circular [93] 3.24 Circular [94] 2.47 Triangular [95] 2.94 Semi-circular [96] 2.08 Square wave [97] 2…”

Section: Roughness In Multiple Forms With the Gapmentioning

confidence: 99%

Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater

Nagayach,

Sharma,

Agrawal

et al. 2023

E3S Web Conf.

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The energy collected from various renewable resources, such as sunlight, geothermal warmth, wind, and water, is referred to as renewable power. The sun is the ultimate source of vitality. Solar radiation vitality can be utilized in many functions, such as heating buildings and dusty foliage crops, dying chicken, wood taste, and treating modern elements. All the energy patterns in nature asking them are the origin of the sun. The solar air heater (SAH) is very common along with commonly applied sun-oriented heating apparatus. Perhaps, SAH is utilized for a wide range of applications, from residential to commercial. Improving the SAH efficiency is done by applying rib elements on the bottom side of the roughness element ribs, grooves, fins, baffles, twisted tapes, deflectors, etc., and improved Thermo-hydraulic performance (THP). Various investigators have prepared several practices in their research work to obtain a greater transfer of thermal energy between these solar collector heaters by applying various rib elements to the absorbent surface. The objective of that study is obliged to describe and conclude tests on the impact of modest rib element height and face projection upon absorber plate along duct surface as artificial rib elements of different shapes on heat transfer along friction factor. The research on artificially roughened SAH ducting is thoroughly analyzed in this paper. The purpose of this paper is to summarize several studies on the thermal and hydraulic performance of synthetically roughened SAH ducting. For the analyzed range of parameters, it was discovered that the usage of arc-shaped-shaped rib geometry and metal grit ribs has the maximum THP parameters in comparison to often roughness geometry. For the tested range of parameters, the use of broken arc ribs has the highest Nu compared to the plain arc-shaped rib roughness. Arc configuration of roughness element exhibits fewer ranges pressure diminishes than the V form design because the produced secondary flow has a curved structure and is rougher.

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Section: Roughness In Multiple Forms With the Gapmentioning

confidence: 99%

Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater

Nagayach,

Sharma,

Agrawal

et al. 2023

E3S Web Conf.

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“…The studies of Gawande et al [23,24] investigated the thermal and hydraulic performance of a solar air heater with chamfered square and right-angle triangular ribs as roughness elements on the absorber plate. The investigation included an experimental study and two-dimensional Computational Fluid Dynamics (CFD) simulations, using the commercial code ANSYS FLUENT 14.5.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Heat Transfer in Power Transformer Radiators via Thermo-Fluid Dynamic Analysis with Periodic Thermal Boundary Conditions

Dorella,

Storti,

Rodriguez

et al. 2023

Preprint

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The efficient dissipation of energy losses in electrical power transformers is crucial to prevent over- heating of their windings and ensure proper functioning. In this study, we investigate the thermal design of a 30 [MVA], 132/34.5/13.8 [kV] power transformer radiator operating in Oil Natural- Air Natural mode, using Computational Fluid Dynamics (CFD) simulations. We introduce artificial body forces in the momentum Navier-Stokes equation to analyze the thermo-fluid dynamic per- formance of secondary transverse flows. Additionally, we propose a numerical scheme to solve the thermal equation with periodic boundary conditions using a reduced length of the oil channel, allow- ing for the decoupling of the thermal and fluid dynamic problems. To enhance the heat transfer, we propose the use of turbulators and wall indentations arrangements. Through our simulations, we analyze the effects of these enhancements on the cooling capacity of the transformer radiator. Our results demonstrate that these modifications increase the heat transfer coefficient and improve the cooling capacity of the radiator. Furthermore, we propose manufacturing considerations for the turbulators and wall indentations arrangements to ensure their practicality. Our findings pro- vide valuable insights into the thermal design of power transformer radiators and demonstrate the effectiveness of turbulators and wall indentations arrangements in enhancing their cooling capacity.

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“…Later, experiments and numerical simulations were performed by Gawande et al (2016) using chamfered square rib on the heated surface. Investigation were carried out for Re number ranging from 3800 to18000 for wide range of (p/e) and (e/D).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Solar Air Heater (SAH) with Triangular Artificial Roughness Having a Curved Top Corner

Zina

Filali

Laouedj

et al. 2019

JAFM

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In the present study, numerical investigation of two-dimensional incompressible air flow through a solar air heater (SAH) with a triangular artificial roughness having a curved top corner is performed using ANSYS Fluent 15.0 based finite volume method. The geometrical parameters of the triangular ribs having a curved top corner such as the roughness height ratio (e/D = 0.021, 0.03 and 0.042) and the roughness pitch ratio (p/e =7.14, 10.70, 14.28 and 17.86) have been investigated for a varied Reynolds number between 3800 to 18000. Flow and energy governing equations were solved with the accosiation of two transport equation for the turbulence kinetic energy k and the dissipation rate ɛ. The RNG k-ε turbulent model have been selected to be the more appropriate turbulence model for the present study. Results indicates that the values of Nusselt number and friction factor strongly depend on the roughness relative height e/D, relative pitch p/e and the value of Re number. The best solar air heater performance could be obtained for e/D=0.042 and p/e=7.14.

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Experimental and CFD-based thermal performance prediction of solar air heater provided with right-angle triangular rib as artificial roughness

Cited by 48 publications

References 36 publications

Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater

Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater

Enhancing Heat Transfer in Power Transformer Radiators via Thermo-Fluid Dynamic Analysis with Periodic Thermal Boundary Conditions

Numerical Investigation of a Solar Air Heater (SAH) with Triangular Artificial Roughness Having a Curved Top Corner

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