MODELING OF PHASE CHANGE TRANSITIONS IN ANSYS FLUENT INCLUDING THERMAL HYSTERESIS

Maité Goderis (Autor:in und Vortragende:r), Adam Buruzs, Fabrizia Giordano, Tilman Barz, Wim Beyne, Michel De Paepe

Publikation: Beitrag in Buch oder TagungsbandVortrag mit Beitrag in TagungsbandBegutachtung

Abstract

To model melting and solidification phenomena in ANSYS Fluent often the default solidification-melting model is employed, which is based on the enthalpy-porosity method. This method utilizes a piece-wise linear enthalpy-temperature relationship and consequently fails to account for crucial thermophysical phenomena such as thermal hysteresis where separate enthalpy-temperature relationships occur for melting and solidification. This study proposes a hysteresis model developed in ANSYS Fluent using User Defined Functions. In contrast to the linear relation assumed in the default model, a smoothstep-function for the enthalpy-temperature relationship is employed. Additionally, the hysteresis model allows for the independent definition of enthalpy-temperature curves for melting and solidification. This feature facilitates a more realistic analysis of the heat transfer in commercial nonpure PCMs during partial melting and solidification processes. The performance of the proposed model is evaluated through a numerical investigation of a heated rectangular enclosure with natural convection effects in the phase change material (PCM). A fluctuating temperature boundary condition is applied to simulate real-world scenarios. Comparative analysis between the hysteresis model and the default solidification-melting model reveals significant differences. Notably, the modified enthalpy-temperature relationship in the hysteresis model influences the presence of natural convection. Thermal hysteresis effects can thus not be neglected, especially when natural convection is the dominant heat transfer mode.
OriginalspracheEnglisch
TitelProceedings of the 9th CHT-24 ICHMT International Symposium on Advances in Computational Heat Transfer May 26 - 30, 2024, Istanbul, Turkiye
DOIs
PublikationsstatusVeröffentlicht - 1 Jan. 2024

Publikationsreihe

NameProceeding of Proceedings of the 9th CHT-24 ICHMT International Symposium on Advances in Computational Heat Transfer May 26 - 30, 2024, Istanbul, Turkiye

Research Field

  • Efficient Buildings and HVAC Technologies
  • Efficiency in Industrial Processes and Systems

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