Transient natural convection in a cylindrical enclosure at high Rayleigh numbers

Papanicolaou, E.; Belessiotis, V.

doi:10.1016/s0017-9310(01)00258-7

Cited by 87 publications

(39 citation statements)

References 31 publications

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“…The work carried out by Cònsul et al [10] in which the storage tank stratification was analysed by using parallel computation techniques can be quoted. The transient natural convection inside a vertical cylinder with an imposed heat flux in the lateral walls was studied by Papanicolaou and Belessiotis [11] by using Reynolds averaged Navier-Stokes (RANS) equations with different turbulent models as closure. Later, the same authors modelled an underground storage with a k-ε RANS model and studied its cool down process.…”

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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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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“…Evans and Stefany (7) could correlate their data for natural convection in cylindrical enclosures using a simple relation similar to what is commonly used for laminar natural convection to vertical walls. A number of numerical studies have been performed for natural convection in cylindrical enclosures (8)~ (13) . Lin and Armfield (8), (9) calculated flow fields and heat transfer in both cylindrical and 2D rectangular enclosures after a step change in the temperature of the sidewalls.…”

Section: Introductionmentioning

confidence: 99%

“…Holzbecher and Steiff (12) and Papanicolaou and Belessiotis (13) included turbulence models in their simulations of natural convection in the cylinder. For mixed convection heat transfer in cylindrical geometry, the most widely studied case is the heated vertical tube.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Averaged Heat Transfer Coefficients in High-Pressure Vessel during Charging with Hydrogen, Nitrogen or Argon Gas

Woodfield

Monde

Mitsutake

2007

JTST

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Heat transfer to the wall of a small pressure vessel during filling with some different kinds of gas was investigated experimentally. The vessel was orientated vertically with the inlet at the top. The space-averaged Nusselt number for the curved wall was found to be a function of both the Reynolds and Rayleigh numbers indicating a mixed convection heat transfer situation. A correlation is proposed for the heat transfer coefficient during charging of the vessel. For the six positions where measurements were taken, the local heat transfer coefficient typically did not differ from the space-averaged value by more than about 30 percent. Measurements were also taken during discharging to atmospheric pressure. For discharging, some of the data was found to agree with a correlation for natural convection in cylindrical geometry. Local Nusselt numbers for discharging tended to be higher towards the bottom of the vessel.

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“…[31,32] the following system of partial differential equations for mass (Equation (1)), momentum (Equation (2)) and energy is applicable (Equation (3)):…”

Section: Balance Equationsmentioning

confidence: 99%

End-User Software for Efficient Sensor Placement in Jacketed Wine Tanks

2018

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Abstract:In food processing, temperature is a key parameter affecting product quality and energy consumption. The efficiency of temperature control depends on the data provided by sensors installed in the production device. In the wine industry, temperature sensor placement inside the tanks is usually predetermined by the tank manufacturers. Winemakers rely on these measurements and configure their temperature control accordingly, not knowing whether the monitored values really represent the wine's bulk temperature. To address this problem, we developed an end-user software which 1. allows winemakers or tank manufacturers to identify optimal sensor locations for customizable tank geometries and 2. allows for comparisons between actual and optimal sensor placements. The analysis is based on numerical simulations of a user-defined cooling scenario. Case studies involving two different tanks showed good agreement between experimental data and simulations. Implemented based on the scientific Linux operating system gmlinux, the application solely relies on open-source software that is available free of charge.

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Transient natural convection in a cylindrical enclosure at high Rayleigh numbers

Cited by 87 publications

References 31 publications

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

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

Measurement of Averaged Heat Transfer Coefficients in High-Pressure Vessel during Charging with Hydrogen, Nitrogen or Argon Gas

End-User Software for Efficient Sensor Placement in Jacketed Wine Tanks

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