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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXTERNAL FLOW’S INFLUENCE ON PCM MELTING TIME IN SPHERES
Submission Author:
João Fidelio Raymundo Júnior , RS
Co-Authors:
João Fidelio Raymundo Júnior, Rejane De Cesaro Oliveski, Gabriel Eberhardt
Presenter: João Fidelio Raymundo Júnior
doi://10.26678/ABCM.ENCIT2020.CIT20-0351
Abstract
A numerical study on the external flow’s influence on the melting of erythritol inside spheres has been carried out. The spheres are arranged in an array and subjected to external flow. This configuration is studied considering three different blockage ratios on the array. The physical model is two-dimensional and transient. The numerical model consists of the continuity, momentum and energy equations and the domain uses a hexahedral mesh. The numerical model is validated using experimental results from the literature and the mesh was verified using the GCI method. Results of liquid fraction over time are presented. All cases present a similar pattern of melting, being more accentuated at the beginning and lower at later moments. For some spheres, there is a reduction in melting time as the distance between them decreases, but that is not the case for spheres at the end of the array. The lowest melting time is seen in a configuration which does not have the maximum neither minimum distance between the spheres, suggesting that the dependency of the melting time in relation to the blockage ratio is not directly neither inversely proportional.
Keywords
Thermal Storage, Phase Change Materials, PCM, Computational Fluid Dynamics
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