Roberts, S J; Robinson, J A J; Lawrence, K (2012) A heat transport model for multiphase materials. NPL Report. MAT 53

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Abstract

A model is presented that can be used to predict thermal transport through a material taking into account any changes of material phase. A finite volume modelling approach is described that uses conservation of energy to balance the heat fluxes into a volume element. The finite volume model may be applied to three-dimensional, multi-material systems subjected to applied temperature and heat flux boundary conditions. The mathematical derivations in this paper do not include explicit expressions describing the change in thermal properties with temperature and phase, however a method is described using a modified energy balance to link with the thermodynamic phase equilibria package MTDATA.

The linking of the NPL thermal transport model TherMOL 3D with MTDATA to form a hybrid model is described, providing a relationship between temperature and stored energy. Predictions from the TherMOL 3D software and the hybrid TherMOL 3D/MTDATA software are presented, which show temperature curves for a steel slab subjected to heat flux boundary conditions held constant in time. These predictions clearly show the difference in temperature upon heating between the TherMOL 3D software and hybrid software due to corrections for phase changes. Analyses of grid sizes are shown to have a significant effect on cell temperatures due to neighbouring cell phase changes.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 53
Keywords:	heat transport, materials, phase, multi-layered, multi-component, finite volume, MTDATA, TherMOL, thermodynamics
Subjects:	Advanced Materials Advanced Materials > Thermodynamics
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5351

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