A CFD based thermo-hydraulic performance analysis of an artificially roughened solar air heater having equilateral triangular sectioned rib roughness on the absorber plate

Yadav, Anil Singh; Bhagoria, J.L.

doi:10.1016/j.ijheatmasstransfer.2013.11.074

Cited by 240 publications

(57 citation statements)

References 42 publications

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“…Previous investigations [29][30][31][32][33][34] indicated that they used different turbulence models for their studies in air flow channels, such as realizable k-ε model, RNG k-ε model, standard k-ε model, standard k-ω, and shear stress transport k-ω model. Therefore, numerical predictions were compared with available experimental data and the RNG k-ε model was selected in this study because it was found to be the better one.…”

Section: Selection Of Turbulence Modelmentioning

confidence: 99%

“…This can be achieved by concurrent thought of thermal as well as hydraulic performances, i.e., the thermo-hydraulic performance parameter, η, which indicates the comparison of the heat transfer enhancement for a roughened channel to a smooth (without rough) channel for the same pumping power requirements, and for fully developed turbulent flows. The following Equation (14) represents the thermo-hydraulic performance parameter [31][32][33][34]36,37]:…”

Section: Thermo-hydraulic Performancementioning

confidence: 99%

“…Yadav et al [27] conducted a CFD analysis on the overall thermal performance of a SAH with V-perforated downstream blocks attached to the heated wall. Several researchers numerically investigated rib roughened rectangular channels and reported the effects of rib shapes, rib spacing, rib height, rib flow attack angle, and channel aspect ratio on the heat transfer, pressure drop, and thermal performance [28][29][30][31][32][33][34]. Table 2 summarises the numerical investigations of some important baffle arrangements reported by various researchers.…”

mentioning

confidence: 99%

“…A critical review on heat transfer enhancement in a rectangular channel revealed that most investigations were carried out experimentally. However, only a few investigations are available those are based on CFD approaches [23][24][25][26][27][28][29][30][31][32][33][34]. Gawande et al [23] conducted a numerical study on the effect of the transverse circular vortex type generator in an air channel.…”

mentioning

confidence: 99%

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Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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This article presents heat transfer and fluid flow characteristics in a solar air heater (SAH) channel with multi V-type perforated baffles. The flow passage has an aspect ratio of 10. The relative baffle height, relative pitch, relative baffle hole position, flow attack angle, and baffle open area ratio are 0.6, 8.0, 0.42, 60˝, and 12%, respectively. The Reynolds numbers considered in the study was in the range of 3000-10,000. The re-normalization group (RNG) k-ε turbulence model has been used for numerical analysis, and the optimum relative baffle width has been investigated considering relative baffle widths of 1.0-7.0.The numerical results are in good agreement with the experimental data for the range considered in the study. Multi V-type perforated baffles are shown to have better thermal performance as compared to other baffle shapes in a rectangular passage. The overall thermal hydraulic performance shows the maximum value at the relative baffle width of 5.0.

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Section: Selection Of Turbulence Modelmentioning

confidence: 99%

Section: Thermo-hydraulic Performancementioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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“…Although numerous studies on the SAHs efficiency improvement have been reported by experimental and numerical work for heat transfer mechanism inside [4,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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Optimizing of heat transfer and flow characteristics within a roughened solar air heater duct with compound turbulators

Al‐Chlaihawi,

Alyas,

Abdullah

2024

Asia-Pacific J Chem Eng

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Thermal systems for solar air heating have been widely used in both industrial and residential contexts, and are essential for converting and recovering solar energy. Thermal performance in solar air heaters (SAHs) can be improved through the repetitive application of artificial roughness to the surfaces. This research work includes a numerical evaluation of SAH performance with artificial rough surfaces made up of combined transverse trapezoidal ribs and chamfered grooves. The ANSYS Fluent software version 2023 R1 was used to simulate SAH with varying relative roughness pitch (), relative roughness heights (), and Reynolds number (). The RNG model was chosen to forecast an enhancement in Nusselt number (), friction factor (), and thermohydraulic performance factor (TPF) for the proposed roughness. Out of multiple roughness parameters analyzed, it was determined that the compound turbulator with and , were the most effective. The TPF for this scenario was determined to be 2.12 at . Finally, a numerical based empirical correlations for and in terms of Re, , and were developed.

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A CFD based thermo-hydraulic performance analysis of an artificially roughened solar air heater having equilateral triangular sectioned rib roughness on the absorber plate

Cited by 240 publications

References 42 publications

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Optimizing of heat transfer and flow characteristics within a roughened solar air heater duct with compound turbulators

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