Print Email Facebook Twitter Sensitivity of numerical predictions to the permeability coefficient in simulations of melting and solidification using the enthalpy-porosity method Title Sensitivity of numerical predictions to the permeability coefficient in simulations of melting and solidification using the enthalpy-porosity method Author Ebrahimi, Amin (TU Delft (OLD) MSE-5) Kleijn, C.R. (TU Delft ChemE/Transport Phenomena) Richardson, I.M. (TU Delft (OLD) MSE-5) Date 2019 Abstract The high degree of uncertainty and conflicting literature data on the value of the permeability coefficient (also known as the mushy zone constant), which aims to dampen fluid velocities in the mushy zone and suppress them in solid regions, is a critical drawback when using the fixed-grid enthalpy-porosity technique for modelling non-isothermal phase-change processes. In the present study, the sensitivity of numerical predictions to the value of this coefficient was scrutinised. Using finite-volume based numerical simulations of isothermal and non-isothermal melting and solidification problems, the causes of increased sensitivity were identified. It was found that depending on the mushy-zone thickness and the velocity field, the solid–liquid interface morphology and the rate of phase-change are sensitive to the permeability coefficient. It is demonstrated that numerical predictions of an isothermal phase-change problem are independent of the permeability coefficient for sufficiently fine meshes. It is also shown that sensitivity to the choice of permeability coefficient can be assessed by means of an appropriately defined Péclet number. Subject meltingsolidificationmushy zonepermeability coefficiententhalpy-porosity method To reference this document use: http://resolver.tudelft.nl/uuid:0e6c9c80-13d3-4f8a-b6ee-6b19381d3e67 DOI https://doi.org/10.3390/en12224360 ISSN 1996-1073 Source Energies, 12 (22) Event XII International Conference on Computational Heat, Mass and Momentum Transfer, 2019-09-03 → 2019-09-06, Rome, Italy Bibliographical note Special Issue Selected Papers from XII International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2019) Part of collection Institutional Repository Document type journal article Rights © 2019 Amin Ebrahimi, C.R. Kleijn, I.M. Richardson Files PDF energies_12_04360.pdf 7.92 MB Close viewer /islandora/object/uuid:0e6c9c80-13d3-4f8a-b6ee-6b19381d3e67/datastream/OBJ/view