Numerical Thermal Study of Heat Transfer Enhancement in Laminar-Turbulent Transition Flow Through Absorber Pipe of Parabolic Solar Trough Collector System

Ibrahim, M.M.; Kasem, Mohamed Mahran

doi:10.5098/hmt.17.20

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…The number of unknowns in the problem then exceeds the number of equations available, and it becomes imperative to modelling turbulent tensors using turbulence models, in order to solve the problem consistently and establish a link between the fluctuating field and the mean field. For more details on turbulent flows and turbulence models [17], we encourage the reader to refer to Schiestel et al's book [18].…”

Section: Turbulence and Numerical Computation: Approaches And Methodsmentioning

confidence: 99%

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Hannaoui,

Boutarfa,

Haidar

2024

FHMT

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The proposed work focuses on the in-depth study of convective heat transfer in the unconfined air gap of a discoidal rotor-stator system. The rotary cooling mechanism is achieved by the injection of two air jets, while the cavity geometry is characterized by a dimensionless parameter G. The numerical analysis primarily concentrated on the effect of flow velocity and rotation on the heat exchange process. More precisely, the range of analysis extends from the rotational Reynolds number Re ω = 2.35 × 10 5 to Re ω = 5.04 × 10 5 , while varying the Reynolds value of the jet in a range from 16 × 10 3 to 55.46 × 10 3 . To carry out this analysis, a numerical simulation was conducted with Ansys-Fluent software, using the RSM turbulence model. The results of the study significantly reveal the impact of rotation on heat exchange transfer within the cavity, identifying two distinct zones of fluid recirculation. These zones exhibit remarkable heat transfer characteristics, contributing to a better understanding of the complex mechanisms governing heat transfer in this particular technological context. Additionally, the analysis of radial mean velocity distributions, as well as local and mean Nusselt numbers, provides further insight into the heat transfer performance of this unique configuration.

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Section: Turbulence and Numerical Computation: Approaches And Methodsmentioning

confidence: 99%

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Hannaoui,

Boutarfa,

Haidar

2024

FHMT

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“…This tube is a metallic tube that is surrounded by a glass cover to reduce heat losses. A thermal working fluid moves through the tube, and the solar power increases the temperature and subsequently the thermal energy of the fluid [4]. The typical components and construction of a PTC are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Detailed performance analysis of parabolic trough collectors including geometric effect

Kasem

2023

JMES

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Parabolic trough collectors (PTCs) have been known for years as one of the leading methods for extracting energy from the sun. In the present work, the performance of PTCs was investigated. However, its performance needs some improvement to be integrated in more and wide range of applications. This idea motivated the author to investigate the performance of parabolic trough collectors in detail. Thus, in the present work, the performance of parabolic trough collectors is investigated. The effect of eight geometric and inlet variables on the PTC performance was evaluated. Two performance factors , the temperature difference and thermal efficiency, were selected. The effect of inlet condition, including inlet mass flow rate and inlet flow temperature reflector geometry, including reflector length and width,receiver diameters, including inlet and outlet reciever diameters, and cover diameters, including the inlet and outlet cover diameters on these PFs was assessed. Eight thermal working fluids were considered. A non-linear mathematical model was developed for PTC and implemented into MATLAB code where an iterative technique was used to conduct the present analyses. Level curves were generated to study the PTC key performance parameters. The curves revealed that the maximum values of the PFs and maximum range of change in these PFs occurred when the inlet conditions were varied. Changes in the inlet temperature, and changes in the reflector geometry yielded the highest and second-highest values. The cover geometry had the minimum effect on the PFs. Moreover, the best maximum efficiency, best maximum temperature difference, and maximum range of efficiency change were obtained for water, air, and carbon dioxide, respectively. The effect of inlet temperature is more significant than the mass flow rate effect on the thermal efficiency, whereas this effect is reversed in case of the temperature difference, by which the mass flow rate exerts the least influence on the temperature difference.

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“…The net impact of relative variations in the thermophysical properties of the nanoparticles, which were sensitive to numerous parameters including size and shape, material and concentration, as well as based fluid thermal properties, was used to determine the improvement of exergy efficiency of nanofluid flow through heat exchanger. Also, Ibrahim and Kasem (2021) presented a novel thermal study of absorber/receiver circular pipe of parabolic trough solar collector system for laminar and turbulent (k-model) fluids flow. In this numerical study, simulations are performed using CFD ANSYS FLUENT software.…”

Section: Introductionmentioning

confidence: 99%

Effect of Absorber Design on Convective Heat Transfer in a Flat Plate Solar Collector: A CFD Modeling

Flilihi¹,

Sebbar²,

Achemlal³

et al. 2022

Frontiers in Heat and Mass Transfer

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In this paper, we made a numerical simulation of convective heat transfer in a rectangular section pipe of a air flat plate solar collector using three forms of the absorber plate namely, simple shape, rectangular-shape, and half circle-shape. The flow is considered laminar and stationary, where the heat exchange between the absorber plate and the fluid takes place in useful area. The computer code in fluid dynamics, the fluent, is applied to integrate the governing equations on each control volume. A detailed description of the fluid flow and heat transfer in the rectangular channel was made. Several simulation were carried out in order to determine the influencing parameters allowing better performances of the collector and ensuring a good homogeneity of the temperature at the exit of the channel. The obtained results showed that the lows mass flow rates of the air increase the average outlet temperature. Also, the use of the second configuration of the absorber (rectangular shape) increases the velocity of the air at the downstream of the channel and promotes more the thermal homogeneity at the outlet of the channel.

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Numerical Thermal Study of Heat Transfer Enhancement in Laminar-Turbulent Transition Flow Through Absorber Pipe of Parabolic Solar Trough Collector System

Cited by 6 publications

References 29 publications

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Detailed performance analysis of parabolic trough collectors including geometric effect

Effect of Absorber Design on Convective Heat Transfer in a Flat Plate Solar Collector: A CFD Modeling

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