Cooling of cylindrical vertical tanks submitted to natural internal convection

Oliveski, Rejane De Césaro; Krenzinger, Arno; Vielmo, Horácio A.

doi:10.1016/s0017-9310(02)00508-2

Cited by 53 publications

(16 citation statements)

References 13 publications

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“…The fluid temperature drop near the vertical tank wall forms a boundary layer with a descending fluid and thus, due to buoyancy effects, bottom layers are filled with cold fluid, resulting in the development of a temperature gradient inside the storage tank. The same behaviour was observed in the study of Oliveski et al [12]. However, for the present case the thermal gradient is more noticeable due to the heat losses to the combustion chamber through the bottom wall of the storage tank.…”

Section: Validation Of the Numerical Resultssupporting

confidence: 91%

“…As observed by Oliveski et al [12] thermal gradients are the largest near the interface fluid/solid. Thus, the mesh has been concentrated in the regions near the walls, while uniform meshes have been used in the solid walls and the insulation materials.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 59%

“…The cooling process of a real prototype of storage tank was studied numerically and experimentally by Oliveski et al [12]. They analysed the transient phenomena taking place due to the heat exchange with the environment.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

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Unsteady natural convection cooling of a water storage tank with an internal gas flue

Hmouda

Rodríguez

Bouden

et al. 2010

International Journal of Thermal Sciences

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a b s t r a c tThe cooling process by natural convection in cylindrical cavities is a phenomenon which takes place in several applications such as solar energy systems. In the present work a storage tank with an internal gas flue is studied experimentally and numerically during its long-term cooling process. The computational domain includes two fluids, i.e. water in the store and air in the chimney, and two external and internal layers of steel separated by polyurethane insulation material. In this paper, the numerical and the experimental analysis of the temperature field inside the tank submitted to an external convection cooling process with a constant convection heat transfer coefficient is presented. The air and the water temperature profiles along the vertical lines are obtained experimentally and numerically, for a cooling period of 90 h. The numerical analysis is carried out using a specific CFD code developed for the present work; an axisymmetric domain has been considered. Finally, a detailed description of the phenomena that occur inside the water part of the domain during the cooling process is also provided.

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Section: Validation Of the Numerical Resultssupporting

confidence: 91%

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 59%

See 1 more Smart Citation

Unsteady natural convection cooling of a water storage tank with an internal gas flue

Hmouda

Rodríguez

Bouden

et al. 2010

International Journal of Thermal Sciences

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“…Later, the same authors modelled an underground storage with a k-ε RANS model and studied its cool down process. Due to the lack of empirical information about the heat transfer coefficients in thermal storage tanks, CFD&HT have also been used in order to obtain correlations capable of characterising the transient heat transfer process inside such equipment [12,13,14]. However, such correlations are in the range of Rayleigh numbers corresponding with low-temperature applications and small devices and thus, out-of-range to be used for molten salt TES.…”

Section: Introductionmentioning

confidence: 99%

Modular object-oriented methodology for the resolution of molten salt storage tanks for CSP plants

et al. 2013

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Two-tank molten salt storages are the most widespread thermal energy storage technology within concentrated solar power plants. In spite of this, there are design aspects such as thermal losses control, optimisation of the storage or how these devices scale up with the increase in power capacity of the plant which still should be considered. In this sense, numerical modelling of these systems can be a powerful tool for reducing their cost. The present work aims at modelling molten salt tanks by proposing a parallel modular object-oriented methodology which considers the different elements of the storage (e.g. tank walls, insulation material, tank foundation, molten salt storage media, etc.) as independent systems. Each of these elements can be solved independently and using different levels of modelling (from global to fully three-dimensional models), while at the same time they are to linked each other through their boundary conditions. The mathematical models used, together with some illustrative examples of the application of the proposed methodology, are presented and discussed in detail. Keywords

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“…The scaling relations were also obtained by the authors [27] for the boundary layer development along a vertical isothermal plate in a linearly stratified fluid with Pr > 1. Oliveski et al [28] made a numerical and an experimental analysis of velocity and temperature fields inside a storage tank submitted to natural convection cooling. All these studies have addressed on the short-term behavior of the cooling/heating process, while the study of the long-term behavior is rare.…”

Section: Introductionmentioning

confidence: 99%