Investigation of heat transfer coefficients in a liquid–liquid direct contact latent heat storage system

Kunkel, Sven; Teumer, Tobias; Dörnhofer, Patrick; Wunder, Frederik; Repke, Jens‐Uwe; Rädle, Matthias

doi:10.1016/j.est.2019.101178

Cited by 17 publications

(2 citation statements)

References 31 publications

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“…In addition to the above scholars studying the effect on heat transfer coefficient of HTF flow rate, some scholars have also studied the influence of HTF size. Sven Kunkel et al 45 studied the heat transfer coefficient between HTF with liquid PCM. The geometric shape of the droplets and the flow rate do not change at the PCM height, and the heat transfer coefficient between the two liquids is determined to approximate 1845 W/m 2 K, and the heat transfer coefficient does not change with the height.…”

Section: Research On the Direct Contact Heat Transfer Processmentioning

confidence: 99%

Research progress of direct contact heat storage based on phase change heat storage

Liu,

Wang,

Chen

et al. 2024

Energy Storage

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Phase change heat storage presents a promising solution to address challenges related to new energy intermittency and waste heat recovery. However, for it to function as an effective energy hub, heat storage becomes crucial. Among the available options, the direct contact heat accumulator stands out due to its simple structure, substantial heat transfer area, and minimal heat transfer resistance, making it a favorable choice for enhancing energy storage rates. Although a great deal of research has been done on phase change materials and heat accumulators over the years, a systematic review of direct‐contact heat accumulators is lacking. This article reviews the related research on direct contact heat storage, aiming to summarize the research work on direct contact phase change heat storage systems. Various phase change materials (PCMs) for direct contact systems are analyzed, and the study of PCM melting crystallization behavior, heat transfer coefficients and system performance in direct contact systems is summarized, as well as the improvement methods for direct contact vessels and PCMs. It provides a useful reference for future research on direct‐contact heat storage systems.

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Section: Research On the Direct Contact Heat Transfer Processmentioning

confidence: 99%

Research progress of direct contact heat storage based on phase change heat storage

Liu,

Wang,

Chen

et al. 2024

Energy Storage

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“…Liquid lenses are formed when droplets are deposited on stationary immiscible, denser, and less volatile liquid surfaces, , and its evaporation is vital in various industrial and scientific areas, such as freezing desalination, , energy storage system, , flow battery, etc. Hence, it is essential to explore the evaporation characteristics of the liquid lens.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Numerical Studies of Liquid Lens Evaporation with Coupled Fields

Shen

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The evaporation of the liquid lens on an immiscible liquid is widely adopted in many industrial and scientific applications, so it is crucial to predict the evaporation rate and lifetime of the liquid lens. During the evaporation, the internal thermocapillary flow, external natural convection, and interfacial evaporative cooling are coupled together and affect the evaporation characteristics greatly. In this paper, the slow and fast evaporation with coupled fields are studied by theoretical analysis and numerical simulation, respectively. It is found that the evaporative cooling can always inhibit the liquid lens evaporation, while the thermocapillary flow and natural convection can enhance the liquid lens evaporation. The total evaporation rate is determined by the competence between the interfacial evaporative flux and upper surface of the liquid lens. With the increasing liquid lens volume, the total evaporation rate will generally increase for fast evaporation, while for slow evaporation that only considers the evaporative cooling effect, the total evaporation rate may decrease at a low tangential angle ratio. The evaporation of the liquid lens follows the constant contact angle mode, the transient variation of volume satisfies the "2/3 law", independent of evaporative cooling, thermocapillary flow, and natural convection, and it is analogous to the sessile droplet evaporation in constant contact angle mode. These findings can provide guidance for the wide application of liquid lens evaporation.

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Alternative Heat Transfer Enhancement Techniques for Latent Heat Thermal Energy Storage System: A Review

Jegadheeswaran¹,

Sundaramahalingam²,

Pohekar

2021

Int J Thermophys

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Investigation of heat transfer coefficients in a liquid–liquid direct contact latent heat storage system

Cited by 17 publications

References 31 publications

Research progress of direct contact heat storage based on phase change heat storage

Research progress of direct contact heat storage based on phase change heat storage

Theoretical and Numerical Studies of Liquid Lens Evaporation with Coupled Fields

Alternative Heat Transfer Enhancement Techniques for Latent Heat Thermal Energy Storage System: A Review

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