Investigation on the Subcooled Boiling in Vertical Pipe With Uncertainties From Boundary Conditions by Using FLUENT

Zhang, Xiang; Zhang, Rui; Lv, Xindi; Cong, Tenglong

doi:10.3389/fenrg.2018.00023

Cited by 3 publications

(4 citation statements)

References 17 publications

(23 reference statements)

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“…The uncertainty of two-phase models and boundary conditions has been analyzed using Latin Hypercube sampling in our previous work (Cong et al, 2018;Zhang et al, 2018c). As a series research, the effects of standard k-ε model uncertainties in two-phase flow was analyzed using a more efficient and economical method, deterministic sampling, in this study.…”

Section: Discussionmentioning

confidence: 99%

“…In our previous work, the effects of two-phase model uncertainties and boundary condition uncertainties were analyzed by the Latin Hypercube sampling (LHS) method, respectively (Cong et al, 2018;Zhang et al, 2018c). However, the large number of samples (1,040 samples for two-phase model uncertainty analysis and 740 samples for boundary condition uncertainty analysis) shows poor efficiency in UQ calculations.…”

Section: Deterministic Sampling Methodsmentioning

confidence: 99%

“…The uncertainties of modeling assumptions in two-phase flow come from these models. The effects of two-phase model uncertainties and boundary condition uncertainties were analyzed systematically in our previous work by assuming that these errors are independent (Cong et al, 2018;Zhang et al, 2018c). On the other hand, the errors in the numerical solutions of equations can be reduced by grid sensitivity analysis and with a convergence check of the solver.…”

Section: Introductionmentioning

confidence: 99%

“…The uncertainty of two-phase models and boundary conditions have been analyzed in our previous work (Cong et al, 2018;Zhang et al, 2018c), as a series research, the uncertainty effects of the turbulence model on local parameters were studied by the DS method in this paper. The DEBORA subcooled boiling experiment (Garnier et al, 2001) was chosen as the benchmark and four different cases were calculated by Fluent to avoid experimental coincidence.…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty Analysis on k-ε Turbulence Model in the Prediction of Subcooled Boiling in Vertical Pipes

et al. 2020

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Computational fluid dynamics (CFD) has become an effective method for researching two-phase flow in reactor systems. However, the uncertainty analysis of Computational fluid dynamics simulation is still immature. The effects of uncertainties from two-phase models and boundary conditions have been analyzed in our previous work. In this work, the uncertainties from a turbulence model on the prediction of subcooled boiling flow were analyzed with the DEBORA benchmark experiments by a deterministic sampling method. Seven parameters in the standard k-ε model, which interrelated momentum, energy, turbulent kinetic energy, and dissipation rate, were studied as uncertainty sources, including Cμ, Cμ,g, C1ε, C2ε, σk, σε, and Prt. Radial parameters were calculated to study the effects of uncertainties from the turbulence model. The contributions of each uncertainty source on void fraction and liquid temperature were also analyzed. It was found that the models can simulate subcooled boiling flow accurately and uncertainty analysis by deterministic sampling can give a reference interval to increase the reliability of results. The C2ε and C1ε, parameters in the production term and dissipation term of transport equations, dominate the radial distributions of void fraction and liquid temperature.

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Section: Discussionmentioning

confidence: 99%

Section: Deterministic Sampling Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uncertainty Analysis on k-ε Turbulence Model in the Prediction of Subcooled Boiling in Vertical Pipes

et al. 2020

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Analysis of the direct steam generation, thermal stresses, and deformations in a tubular receiver of a solar tower

Maytorena

Hinojosa

Moreno

et al. 2021

Journal of Renewable and Sustainable Energy

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In solar tower systems, the thermal receiver is a crucial element. Solar receivers may be exposed to high non-uniform heat fluxes, which requires consideration during their structural design. This paper presents a numerical study of the direct steam generation, thermal stress, and total deformations on a representative tube of an external solar receiver. A non-uniform distribution of solar heat flux on the receiver was considered. The sub-cooled boiling and the direct steam generation were analyzed in terms of the temperature field, the volumetric vapor fraction distribution, and steam quality. Under this configuration, the system can produce a steam quality of 0.113%. To develop the structural analysis of the tube, the internal and external temperature fields of its walls were introduced as boundary conditions. Numerical methodologies for direct steam generation, temperatures, and deformation were validated with experimental data. Since the base case presented high deformation (78.63 cm), the use of clips was proposed. Besides, the number, size, and location of the clips were tested. It was found that deformation can be reduced by about 99.1% by placing clips at different positions along the tube. However, the von-Mises stresses increased, but they did not reach the ultimate tensile strength.

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Enhancing the Thermal Performance of a Central Tower Tubular Solar Receiver With Direct Steam Generation by Using Internal Fins and Thicknesses Variation

Maytorena

Hinojosa

Moreno

et al. 2023

ASME Journal of Heat and Mass Transfer

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This study provides a comprehensive analysis of the thermal behavior of tubular solar receivers used for direct steam generation, focusing on the effects of different wall thicknesses and longitudinal rectangular fins on the internal surface. The study evaluated six tubes, including two tubes with distinct wall thicknesses (5mm and 3mm) without fins and four tubes with fins but varying configurations. These tubes represent external tubular receivers used in solar central tower plants and operate at 4.5 MPa with a non-uniform solar flux averaging 0.8 MW/m2. Adding longitudinal fins to the tubes significantly reduced the maximum temperature on the irradiated surface and improved heat transfer to the fluid. The study concluded that the 45F5 receiver, which has three fins on the internal section, outperforms the other receivers, presenting a higher vapor generation. Furthermore, the 45F5 geometry enhances heat transfer, allowing the lowest maximum Biot number. These results are crucial for designing tubular solar receivers with direct steam generation systems and improving their efficiency in generating energy from renewable sources.

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Investigation on the Subcooled Boiling in Vertical Pipe With Uncertainties From Boundary Conditions by Using FLUENT

Cited by 3 publications

References 17 publications

Uncertainty Analysis on k-ε Turbulence Model in the Prediction of Subcooled Boiling in Vertical Pipes

Uncertainty Analysis on k-ε Turbulence Model in the Prediction of Subcooled Boiling in Vertical Pipes

Analysis of the direct steam generation, thermal stresses, and deformations in a tubular receiver of a solar tower

Enhancing the Thermal Performance of a Central Tower Tubular Solar Receiver With Direct Steam Generation by Using Internal Fins and Thicknesses Variation

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