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Faden, Moritz ; König-Haagen, Andreas ; Höhlein, Stephan ; Brüggemann, Dieter:
An implicit algorithm for melting and settling of phase change material inside macrocapsules.
In: International Journal of Heat and Mass Transfer.
Bd. 117
(2018)
.
- S. 757-767.
ISSN 0017-9310
DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2017.10.033
Abstract
A new, implicit algorithm for melting and settling of macro-encapsulated phase change material (PCM) is presented. The fixed grid mathematical model is based on the enthalpy-porosity technique and the volume of fluid (VOF) method. An immersed boundary method is applied to calculate the solid settling velocity, which is then prescribed by an extended Darcy term. As a test case, unfixed melting in a quasi two-dimensional cubic capsule is chosen. The newly introduced implicit algorithm is compared to an existing explicit algorithm and it is shown that the implicit calculation greatly improves the stability of the model. Moreover, the numerical model is validated against experiments performed within this work, whereby for the first time the settling velocity of the solid PCM is measured directly. Good agreement is found between simulation and experiment. The abilities of the new algorithm are demonstrated by multiple calculations with varying wall temperatures. Thereby, it is found that the solid settling velocity is at a quasi steady state only for a certain time. This time span reduces for higher wall temperatures.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Close-contact melting; Phase change material; Numerical model; OpenFOAM |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Technische Thermodynamik und Transportprozesse 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 08:18 |
| Letzte Änderung: | 14 Sep 2022 13:37 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/47281 |