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Numerical Modelling of Wetting Phenomena During Melting of PCM

Titelangaben

Kasibhatla, Raghavendra Rohith ; König-Haagen, Andreas ; Brüggemann, Dieter:
Numerical Modelling of Wetting Phenomena During Melting of PCM.
In: Procedia Engineering. Bd. 157 (2016) . - S. 139-147.
ISSN 1877-7058
DOI: https://doi.org/10.1016/j.proeng.2016.08.349

Abstract

Latent heat thermal energy storage (LHTES) units using phase change material (PCM) exhibit a high thermal capacity, but also a low charging and discharging power. Macro-encapsulation of PCM is one way of enhancing the heat transfer rate in thermal storage units. During encapsulation, the cavity left to reduce mechanical stresses in the macro capsule, locks air. This makes the capsule a multiphase system consisting of immiscible phases namely PCM and air. Numerical modelling of a PCM capsule enables a detailed understanding of the phase change process of the PCM under the influence of air. In this article, two immiscible fluids PCM and air have been modeled using a continuum surface force (CSF) model in the open source computational fluid dynamics (CFD) software, OpenFOAM. The wetting of the melted PCM on the capsule wall is taken into account by implementing a contact angle boundary condition. The surface tension of the PCM with air is just contributed to the liquid phase of the PCM. The nonlinear enthalpy-temperature relation during the phase change is taken into consideration by a source-based fictitious method. The flow in the solid phase of the PCM is ramped down by considering a high solid viscosity. Experimental results are employed to validate the overall model. The results obtained from the complete numerical model have shown a great acceptance when compared with experiments. Despite several small deviations in the results, the numerical modelling is a potential tool to optimize the efficiency of thermal storage units.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: International Conference on Computational Heat and Mass Transfer
Keywords: CFD; PCM; melting and solidification; multiphase; surface tension; convective heat transfer
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Technische Thermodynamik und Transportprozesse
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Technische Thermodynamik und Transportprozesse > Lehrstuhl Technische Thermodynamik und Transportprozesse - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profilfelder > Emerging Fields > Energieforschung und Energietechnologie
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Profilfelder
Profilfelder > Emerging Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 01 Mär 2019 08:49
Letzte Änderung: 11 Mär 2019 09:38
URI: https://eref.uni-bayreuth.de/id/eprint/47435