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Numerical modelling of melting and settling of an encapsulated PCM using variable viscosity

Title data

Kasibhatla, Raghavendra Rohith ; König-Haagen, Andreas ; Rösler, Fabian ; Brüggemann, Dieter:
Numerical modelling of melting and settling of an encapsulated PCM using variable viscosity.
In: Heat and Mass Transfer. Vol. 53 (May 2017) Issue 5 . - pp. 1735-1744.
ISSN 1432-1181
DOI: https://doi.org/10.1007/s00231-016-1932-0

Abstract in another language

Thermal energy storage units using macro-encapsulated PCM in industrial and residential applications are contemporary due to better efficiency during charging and discharging. This article focuses on numerical modelling of the melting process in a macro-encapsulated PCM. Accounting the non-linear enthalpy-temperature relation and ramping down the velocity in solid phase is therefore fundamental. In the present article the variable viscosity method is implemented to ramp down the solid velocity and allow settling of the solid phase. This complete numerical model of melting and settling of PCM in a capsule is implemented in OpenFOAM. The numerical results for different solid viscosities are validated with experiments and show good agreement. The influence of the solid viscosity value and the pressure--velocity convergence is studied. It is observed that the pressure--velocity convergence only plays a greater role in the case where the computation of the exact solid velocity is required.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 01 Mar 2019 09:20
Last Modified: 01 Mar 2019 09:20
URI: https://eref.uni-bayreuth.de/id/eprint/47428