A reference solution for phase change with convection

Hannoun, Noureddine; Alexiades, Vasilios; Mai, T. Z.

doi:10.1002/fld.979

Cited by 46 publications

(31 citation statements)

References 25 publications

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“…The analysis of the past (till very recent) literature on the two-dimensional numerical simulation of this Gau & Viskanta experiment leads to the following significant considerations: i) the multicellular flow structure of the melt convection meets expectations from fluid dynamics (Lee & Korpela [38], Derebail & Koster [17]), and from ad hoc stability analysis of melting from a side (Le Quere & Gobin [39]), ii) the multicellular flow structure of the melt convection appears combined with unphysical wavy shaped phase fronts (Dantzig [14], Stella & Giangi [48], Hannoun et al [27]), iii) certain low order numerical schemes yield one main cell melt flow and produce smoother phase fronts, surprisingly closer to experimental observation (Brent et al [6], Viswanath & Jaluria [55]), iv) some specialists, counting on highly accurate numerical discretizations, have started to explain the inconsistencies by conjecturing that the mathematical models in use for phase change with convection are not adequate for this experiment (Hannoun et al [26], Tenchev et al [51]). …”

Section: Discussionmentioning

confidence: 99%

On the importance of solid deformations in convection-dominated liquid/solid phase change of pure materials

Mansutti

Bucchignani

2011

Appl Math

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Section: Discussionmentioning

confidence: 99%

On the importance of solid deformations in convection-dominated liquid/solid phase change of pure materials

Mansutti

Bucchignani

2011

Appl Math

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“…A Darcy's law type of porous medium treatment is used to account for the effect of phase change on nature convection. The corresponding mathematical model can be found in Hannoun et al's study [17]. Results obtained for the two enclosures are presented together for the purpose of comparison.…”

Section: Numerical Analysismentioning

confidence: 97%

A comparison study on melting inside the rectangular and curved unit with a vertical heating wall

Gao

et al. 2015

J Therm Anal Calorim

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Efficient and rational use of thermal energy requires the design and development of suitable and costeffective latent heat storage systems. In this study, a novel curved thermal storage unit is put forward and its thermal behavior has been numerically compared with the traditional rectangular PCM-based thermal storage unit. The solid-liquid interface evolution, liquid flow pattern and temperature distribution are presented. Transient Nu at the heating wall and full melting time are also calculated. The numerical results show the high impact of the enclosure geometry on melting and nature convection. A reduction of 30.6 % in thermal storage time has been achieved by changing the unit from rectangular to curve. Moreover, parametric studies are conducted to assess how thermal performance of the units is affected by the heating wall temperature and PCM thermal conductivity. Correlations encompassing a wide range of parameters are developed in terms of full melting time. Results indicate that proportion of full melting time reduced for the curved unit is almost a constant value and does not vary significantly with these factors. All these may be very helpful for the design of more efficient thermal storage units.

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“…The first case is a benchmark problem for melting with natural convection of low-Prandtl-number PCMs. The primary reason for selecting this case is that it has been extensively studied in the literature [87][88][89] and thus provides a quantitative comparison for our numerical methods. The second case involves sodium nitrate subject to alternate melting and solidification controlled by a stepwise-varying boundary temperature.…”

Section: De-fg36-08go18146 Research and Development For Novel Tes Sysmentioning

confidence: 99%

Research and Development for Novel Thermal Energy Storage Systems (TES) for Concentrating Solar Power (CSP)

Faghri¹,

Bergman²,

Pitchumani³

2013

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Executive Summary:The overall objective was to develop innovative heat transfer devices and methodologies for novel thermal energy storage systems for concentrating solar power generation involving phase change materials (PCMs). Specific objectives included embedding thermosyphons and/or heat pipes (TS/HPs) within appropriate phase change materials to significantly reduce thermal resistances within the thermal energy storage system of a large-scale concentrating solar power plant and, in turn, improve performance of the plant. Experimental, system level and detailed comprehensive modeling approaches were taken to investigate the effect of adding TS/HPs on the performance of latent heat thermal energy storage (LHTES) systems. Experimental results proved the superior performance of HPs to increase the heat transfer rates compared to finned and non-finned cases. Quantitatively, inclusion of heat pipes increased PCM melting rates by approximately 60%, while the fins were not as effective. During solidification, the heat pipe-assisted configuration transferred approximately twice the energy between a heat transfer fluid and the PCM, relative to both the fin-assisted LHTES and the non-heat pipe, non-fin configurations.Comprehensive multiphase multi-dimensional simulations were conducted to provide a better understanding of the fundamental physical phenomena involved in thermal energy storage in a phase change media with embedded TS/HPs, and also to provide input for the system level model. A system level model, leveraged by the input from the comprehensive model, was developed to predict the response of large-scale TS/HP-assisted LHTES systems in a computationally-effective manner. Consistent with the experimental results, the results of the system level model also demonstrated a significant increase in heat transfer rates associated with HP-assisted LHTES systems.The developed system level model was employed to predict the performance of a large-scale LHTES system utilizing multiple PCMs in a cascaded configuration. It was shown that the maximum exergy recovery can be achieved by using a cascaded configuration. Optimization studies were performed using the system level model and the preferred configurations of HPs in the LHTES systems were identified. Exergy analysis of LHTES systems was carried out considering the practical constraints imposed on the system in solar applications. Novel guidelines were proposed for design and optimization of LHTES systems for solar applications. Economic aspects of TS/HPassisted LHTES systems were also investigated and it was shown that these systems are cost competitive with the state of the art thermal energy storage systems currently in use. DE-FG36-08GO18146Research and Development for Novel TES Systems for CSP University of Connecticut 3 Background:Energy storage capability is desirable in solar and wind electric power applications due to the intermittent nature of the energy generated. In solar thermal generation, thermal energy storage is the preferred energy storage mode [1]...

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A reference solution for phase change with convection

Cited by 46 publications

References 25 publications

On the importance of solid deformations in convection-dominated liquid/solid phase change of pure materials

On the importance of solid deformations in convection-dominated liquid/solid phase change of pure materials

A comparison study on melting inside the rectangular and curved unit with a vertical heating wall

Research and Development for Novel Thermal Energy Storage Systems (TES) for Concentrating Solar Power (CSP)

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