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Heat and Mass Transport Modelling in Multi-material Systems


Transport Modelling

The speed at which heat or mass is transferred through a material is of great importance to engineers and manufacturers. Depending on the application it may be desirable to have a slow transfer of heat, for insulating purposes, or a fast transfer of heat, for increased productivity in moulding applications or for higher efficiency heat exchangers. Mass diffusion is important in such processes as moisture permeability of paint films or the degradation of the matrix in polymer composite laminates and some packaging material. Plastic products are increasingly being made as layered designs so the manufacturer has the freedom to tailor the products properties to a particular application.

To better understand how a material is performing under service conditions or during manufacturing it is desirable to use modelling and visualisation techniques to predict the material response. Transport modelling refers to the modelling of heat and mass transfer as both are considered as transport processes that originate from molecular activity. Heat transfer is initiated by a temperature difference in a medium while mass transfer is initiated by a difference in the concentration (chemical potential for more complex systems with stress gradients) of some chemical species in a mixture.

TherMOL Software

The software tool TherMOL has been specifically developed at NPL for generic applications which require modelling of multi-material systems, subjected to transient heat or mass transfer. TherMOL currently has the capability to model 3D material arrays and uses optimisation methods and the NPL Grid to help determine unknown material and model parameters. TherMOL is currently being developed at NPL in the following areas:

link to information about the TherMOL software Click here for more information about the TherMOL software and some example applications
link to publications Publications
For more information please contact Jim Robinson

J A J Robinson
Materials Division
NPL, Hampton Road
Teddington, Middlesex
TW11 0LW
Tel: +44 (0)20 8943 8674

Updated 7 May 2010