Entropy production calculation for turbulent shear flows and their implementation in cfd codes

Kock, Fabian; Herwig, Heinz

doi:10.1016/j.ijheatfluidflow.2005.03.005

Cited by 298 publications

(103 citation statements)

References 17 publications

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“…These entropy generation rates were obtained locally from temperature and velocity fields obtained from the numerical analysis. The entropy generation rates were determined according to the general equations presented by Herwig, 2004, Kock andHerwig, 2005).…”

Section: Entropy Generation Analysismentioning

confidence: 99%

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Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

et al. 2016

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HIGHLIGHTS• Effect of optical errors on performance of a parabolic trough receiver is presented.• Actual heat flux profiles were obtained using Monte Carlo ray tracing and presented.• Thermal and thermodynamic analysis of the receiver is determined numerically.• Effect of optical errors on heat flux and temperature distribution is investigated.• Influence of optical errors on receiver entropy generation rates is presented. ABSTRACTThis paper presents results of an investigation covering the influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough system. The optical performance was evaluated by using Monte Carlo ray tracing for slope errors and specularity For the range of parameters considered, the intercept factor reduces by up to 21% while the overall thermal efficiency reduces by up to 17% as optical errors increase. Receiver thermodynamic performance is shown to deteriorate as slope errors increase.

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Section: Entropy Generation Analysismentioning

confidence: 99%

“…The entropy generation due to the fluid friction irreversibility is given by (Kock and Herwig, 2005)…”

Section: Entropy Generation Analysismentioning

confidence: 99%

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

et al. 2016

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“…For such a configuration, the destruction of available work or exergy loss is less when compared with a configuration with higher entropy generation rates [26]. As such, the entropy generation minimization method has been used by several researchers for optimization of thermodynamic systems [36,37] while others have applied it to analysis heat transfer problems [38][39][40]. In heat transfer enhancement, the entropy generation in the enhanced device should be lower than entropy generation in a non-enhanced device for better thermodynamic performance [26].…”

Section: Entropy Generationmentioning

confidence: 99%

“…The entropy generation rate per unit volume is determined as a sum of the heat transfer irreversibility and fluid friction irreversibility from the following relations [38]:…”

Section: Entropy Generationmentioning

confidence: 99%

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts

2014

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In this paper, a numerical investigation of thermal and thermodynamic performance of a receiver for a parabolic trough solar collector with perforated plate inserts is presented. The analysis was carried out for different perforated plate geometrical parameters including dimensionless plate orientation angle, the dimensionless plate spacing, and the dimensionless plate diameter. The Reynolds number varies in the range 1.02×10 4 ≤ Re ≤ 7.38 × 10 5 depending on the heat transfer fluid temperature. The fluid temperatures used are 400 K, 500 K, 600 K and 650 K. The porosity of the plate was fixed at 0.65. The study shows that, for a given value of insert orientation, insert spacing and insert size, there is a range of Reynolds numbers for which the thermal performance of the receiver improves with the use of perforated plate inserts. In this range, the modified thermal efficiency increases between 1.2 -8 %. The thermodynamic performance of the receiver due to inclusion of perforated plate inserts is shown to improve for flow rates lower than 0.01205 m 3 /s. Receiver temperature gradients are shown to reduce with the use of inserts. Correlations for Nusselt number and friction factor were also derived and presented.

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“…The entropy generation method is widely used for design and optimisation of thermal systems and thermal system components [44][45][46][47]. Minimum entropy generation corresponds to the maximum power output since destruction of available work will be a minimum according to the Gouy-Stodola theorem [44].…”

Section: Thermodynamic Optimisationmentioning

confidence: 99%

Multi-objective and thermodynamic optimisation of a parabolic trough receiver with perforated plate inserts

Mwesigye

Bello‐Ochende

Meyer

2015

Applied Thermal Engineering

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In this paper, multi-objective and thermodynamic optimisation procedures are used to investigate the performance of a parabolic trough receiver with perforated plate inserts. Three dimensionless perforated plate geometrical parameters considered in the optimisation include the dimensionless orientation angle, the dimensionless plate diameter and the plate spacing per unit meter. The Reynolds number varies in the range 1.02 × 10 4 ≤ Re ≤ 1.36×10 6 depending on the fluid temperature. The multi-objective optimisation was realised through the combined use of computational fluid dynamics, design of experiments, response surface methodology and the Non-dominated Sorted Genetic Algorithm-II. For thermodynamic optimisation, the entropy generation minimisation method was used to determine configurations with minimum entropy generation rates. Keywords

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Entropy production calculation for turbulent shear flows and their implementation in cfd codes

Cited by 298 publications

References 17 publications

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts

Multi-objective and thermodynamic optimisation of a parabolic trough receiver with perforated plate inserts

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