Heat Transfer and Friction Characteristics of Artificially Roughened Duct used for Solar Air Heaters—a Review

Kumar, K. Ravi; Prajapati, D.R.; Samir, Sushant

doi:10.1007/s40032-017-0415-5

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…Turbulence produced by artificial roughness helps in breaking the laminar sub layer that was formed close to absorber plate in passage of air flow [11]. Breaking of sub layer helps in increasing heat transfer rate, but because of an increase in turbulence the pumping power requirements also increases [12]. M.S.…”

Section: Introductionmentioning

confidence: 99%

Performance Investigation of Sinusoidal Corrugated Absorber Plate Solar Air Heater

Kumar

Debbarma

2022

J. Phys.: Conf. Ser.

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This paper presents the CFD analysis of performance investigation of sinusoidal corrugated absorber plate solar air heater (SAH). The thermal performance is investigated with various inlet mass flow rates and solar heat flux. Simulation process of this model is carried out using CFD base analysis using Ansys (fluent) software. Air heater involving sinusoidal absorber plate, baffles and fin are modelled by ANSYS Workbench. Base model CFD results are validated against published ones and found to have a good agreement. In this paper we compare thermal efficiency and temperature at the exit of sinusoidal absorber plate solar air heater with fin, baffles and without fin and baffles. Baffles help in creating recirculation, separation and turbulence zones in the flow passage and fin helps in increasing the net heat transferring area between sinusoidal plate and flowing air. Thus, for the same size as the air heater, thermal efficiency increases. Thermal efficiency increases with rise in mass flow rate and outlet temperature decrease with the increase in mass flow rate. Computations are based on FVM, shear stress transport (SST) k-ω turbulence model, and SIMPLE algorithm has been implemented. CFD tool is used to find out the temperature distribution inside the solar air heater.

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Section: Introductionmentioning

confidence: 99%

Performance Investigation of Sinusoidal Corrugated Absorber Plate Solar Air Heater

Kumar

Debbarma

2022

J. Phys.: Conf. Ser.

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“…Solar air duct heat exchangers target many studies (Amraoui & Aliane, 2018;Hassan & Abo-Elfadl, 2018;Ho et al, 2017). The inclusion of obstacle-type vortex generators is one of the most effective and ongoing techniques to date (Ameur, 2020;Ameur & Menni, 2019;Jain et al, 2019;Kumar et al, 2018;Kumar & Kim, 2015). We present in this axis some of the numerical and experimental studies that have become popular in this field, starting with researchers Promvonge and Thianpong (2008).…”

Section: Introductionmentioning

confidence: 99%

Numerical calculations of the thermal-aerodynamic characteristics in a solar duct with multiple V-baffles

Menni

Ghazvini

Ameur

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The study aimed to enhance the heat transport by improving the hydrodynamic structure of the system by changing and restructuring the duct's internal geometry. Modern fins, of the shape 'V', have been proposed with different dimensions, and they are periodically arranged over the duct surfaces. The most important steps of this research are the change in the V-fin attack-angle (40°-80°), length (H b /2, 3H b /4, H b , 5H b /4 and 3H b /2), and separation length (D s /2, 3D s /4, D s and 5D s /4), as well as the flow rate (6 × 10 3-3 × 10 4). The study yielded an optimum case for a 40-degree attack-angle, with a factor of thermal enhancement of 2.163 for the highest value of Reynolds number. On the other hand, improving the length of the V-fins or decreasing in the space between them, increases the flow strength by enlarging the recycling cells, which reflects on the hydrodynamic behavior, and changes the heat transfer. The presence of this new model of fins also highlights a hydrothermal improvement ranging between 1.196 and 23.779 percent compared to the previously indicated models, reflecting the effectiveness of the new system of solar heat exchangers with air V-finned ducts.

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A comprehensive review on the effect of turbulence promoters on heat transfer augmentation of solar air heater and the evaluation of thermo-hydraulic performance using metaheuristic optimization algorithms

Pramod,

Arunachala,

Madhwesh

et al. 2024

Environ Dev Sustain

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Solar air heaters are characterized by poor thermal performance due to limited heat transfer capability of air, thereby necessitating the need for design modifications. Among a different system performance augmentation technique, turbulence promotors are widely used owing to its effectiveness. Based on design parameters such as geometry, size, pitch and arrangement of turbulence promoters, varying levels of heat transfer increment with the pressure drop penalty is achievable. This led to the development of new designs which could offer on optimum thermo-hydraulic performance for a wide range of Reynolds number. Such research invariably requires a thorough insight of data related to various design parameters and optimal thermal–hydraulic performance range. This article provides a detailed overview of various turbulence promotor designs and their optimal thermal–hydraulic performance ranges compiled from a wide spectrum of experimental and numerical studies. Apart from outlining the general flow characteristics of each turbulator design, this study also evaluates different metaheuristic optimization algorithm such as bonobo optimization (BO), particle swarm optimization and teaching–learning-based optimization algorithm for enhancing the thermal–hydraulic performance parameter (THPP). The study shows that the BO algorithm does not exhibit local trapping due to its self-adapting nature of the optimized parameters which makes it a promising choice for THPP optimization studies in air heater applications. The extensive review also shows that the arrangement pattern of rib turbulator plays a key role in thermo-hydraulic performance augmentation. Based on the BO optimization analysis, the range of THPP is determined for the optimized geometry of turbulence promoters. In the pool of rib design, transverse prism rib, multi-V-rib, multi-V-shaped rib with staggered rib, sinewave-shaped rib with gap and S-shaped ribs exhibits an optimal THPP range of 2.05–3.32, 2.43–2.94, 3.00–3.61, 1.58–3.40 and 2.05–3.74, respectively. Other turbulence promotor designs such as winglet vortex generator, dimple protrusion in arc shape and multi-V-baffles exhibits optimal THPP range of 1.95–2.2, 2.44–3.68 and 1.75–2.01, respectively. At the end, the study proposes key research gaps such as the use of combined ribs and vortex generators and discrete fin arrays of different geometry as future scope of research. Graphical abstract

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Heat Transfer and Friction Characteristics of Artificially Roughened Duct used for Solar Air Heaters—a Review

Cited by 6 publications

References 58 publications

Performance Investigation of Sinusoidal Corrugated Absorber Plate Solar Air Heater

Performance Investigation of Sinusoidal Corrugated Absorber Plate Solar Air Heater

Numerical calculations of the thermal-aerodynamic characteristics in a solar duct with multiple V-baffles

A comprehensive review on the effect of turbulence promoters on heat transfer augmentation of solar air heater and the evaluation of thermo-hydraulic performance using metaheuristic optimization algorithms

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