Natural Convection at a Solid-Liquid Phase Change Interface

2004 ◽  
pp. 127-170
Author(s):  
Dominique Gobin
Keyword(s):  
Natural Convection ◽  
Liquid Phase ◽  
Phase Change ◽  
Solid Liquid

Energy Storage With Solid/Liquid Phase Change in Presence of Natural Convection

2001 ◽  
Author(s):  
M. Pinelli ◽  
S. Piva
Keyword(s):  
Natural Convection ◽  
Energy Storage ◽  
Liquid Phase ◽  
Phase Change ◽  
Change Process ◽  
Solid Phase ◽  
High Energy ◽  
Heat Transfer Process ◽  
Phase Change Process ◽  
Solid Liquid

Abstract Solid/liquid phase change process has received great attention for its capability to obtain high energy storage efficiency. In order to analyse these systems, undergoing a solid/liquid phase change, in many situations the heat transfer process can be considered conduction-dominated. However, in the past years, it has been shown that natural convection in the liquid phase can significantly influence the phase change process in terms of temperature distributions, interface displacement and energy storage. In this paper, a procedure to analyse systems undergoing liquid/solid phase change in presence of natural convection in the liquid phase based on the utilisation of a commercial computer code (FLUENT), has been developed. This procedure is applied to a cylinder cavity heated from above and filled with a Phase Change Material. It was found that when the coupling with the environment, even if small, is considered, natural convection in the liquid phase occurs. The numerical results are then compared with available experimental data. The analysis shows that the agreement between numerical and experimental results is significantly improved when the results are obtained considering the presence of circulation in the liquid phase instead of considering the process only conduction-dominated. Furthermore, some interesting features of the flow field are presented and discussed.

scholarly journals Parallel finite-element codes for the simulation of two-dimensional and three-dimensional solid–liquid phase-change systems with natural convection

2020 ◽  
Vol 257 ◽  
pp. 107492
Author(s):  
Georges Sadaka ◽  
Aina Rakotondrandisa ◽  
Pierre-Henri Tournier ◽  
Francky Luddens ◽  
Corentin Lothodé ◽  
...  
Keyword(s):  
Finite Element ◽  
Natural Convection ◽  
Liquid Phase ◽  
Phase Change ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Parallel Finite Element ◽  
Solid Liquid

Solid/Liquid Phase Change in Presence of Natural Convection: A Thermal Energy Storage Case Study

2003 ◽  
Vol 125 (3) ◽  
pp. 190-198 ◽  
Author(s):  
M. Pinelli ◽  
S. Piva
Keyword(s):  
Natural Convection ◽  
Energy Storage ◽  
Liquid Phase ◽  
Phase Change ◽  
Change Process ◽  
Solid Phase ◽  
High Energy ◽  
Heat Transfer Process ◽  
Phase Change Process ◽  
Solid Liquid

Solid/liquid phase change process has received great attention for its capability to obtain high energy storage efficiency. In order to analyze these systems, undergoing a solid/liquid phase change, in many situations the heat transfer process can be considered conduction-dominated. However, in the past years, it has been shown that natural convection in the liquid phase can significantly influence the phase change process in terms of temperature distributions, interface displacement and energy storage. In this paper, a procedure to analyze systems undergoing liquid/solid phase change in presence of natural convection in the liquid phase based on the utilisation of a commercial computer code (FLUENT), has been developed. This procedure is applied to the study of a cylinder cavity heated from above and filled with a phase change material. It was found that when the coupling with the environment, even if small, is considered, natural convection in the liquid phase occurs. The numerical results are then compared with available experimental data. The analysis shows that the agreement between numerical and experimental results is significantly improved when the results are obtained considering the presence of circulation in the liquid phase instead of considering the process only conduction-dominated. Furthermore, some interesting features of the flow field are presented and discussed.

scholarly journals Analysis of Solid-Liquid Phase Change Under Pulsed Heating

2005 ◽  
Author(s):  
Shankar Krishnan ◽  
Jayathi Y. Murthy ◽  
Suresh V. Garimella
Keyword(s):  
Porous Medium ◽  
Natural Convection ◽  
Liquid Phase ◽  
Phase Change ◽  
Pulse Width ◽  
Energy Transport ◽  
Metal Foams ◽  
Governing Equations ◽  
Pulsed Heating ◽  
Solid Liquid

Solid/liquid phase change occurring in a rectangular container with and without metal foams subjected to periodic pulsed heating is investigated. Natural convection in the melt is considered. Volume-averaged mass and momentum equations are employed, with the Brinkman-Forchheimer extension to Darcy’s law to model the porous-medium resistance. A local thermal non-equilibrium model, assuming equilibrium melting at the pore scale, is employed for energy transport through the metal foams and the interstitial phase change material (PCM). Separate volume-averaged energy equations for the foam and the PCM are written and are closed using a heat transfer coefficient. The enthalpy method is employed to account for phase change. The governing equations for the PCM without foam are derived from the porous medium equations. The governing equations are solved implicitly using a finite volume method on a fixed grid. The coupled effect of pulse width and natural convection in the melt is found to have a profound effect on the overall melting behavior. The influence of pulse width, Stefan number, Rayleigh number and interstitial Nusselt number on the temporal evolution of the melt front location and the melting rate for both the cases with and without metal foams is investigated.

scholarly journals Analysis of Solid–Liquid Phase Change Under Pulsed Heating

2006 ◽  
Vol 129 (3) ◽  
pp. 395-400 ◽  
Author(s):  
Shankar Krishnan ◽  
Jayathi Y. Murthy ◽  
Suresh V. Garimella
Keyword(s):  
Natural Convection ◽  
Liquid Phase ◽  
Phase Change ◽  
Pulse Width ◽  
Energy Transport ◽  
Melting Behavior ◽  
Metal Foams ◽  
Governing Equations ◽  
Pulsed Heating ◽  
Solid Liquid

Solid/liquid phase change occurring in a rectangular container with and without metal foams subjected to periodic pulsed heating is investigated. Natural convection in the melt is considered. Volume-averaged mass and momentum equations are employed, with the Brinkman–Forchheimer extension to Darcy’s law used to model the porous resistance. A local thermal nonequilibrium model, assuming equilibrium melting at the pore scale, is employed for energy transport through the metal foams and the interstitial phase change material (PCM). Separate volume-averaged energy equations for the foam and the PCM are written and are closed using a heat transfer coefficient. The enthalpy method is employed to account for phase change. The governing equations for the PCM without foam are derived from the porous medium equations. The governing equations are solved implicitly using a finite volume method on a fixed grid. The coupled effect of pulse width and natural convection in the melt is found to have a profound effect on the overall melting behavior. The influence of pulse width, Stefan number, and Rayleigh number on the temporal evolution of the melt front location and the melting rate for both the cases with and without metal foams is investigated.

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