Thermal conductivity bounds for isotropic, porous materials Carson, J K; Lovatt, S J [AgResearch Ltd., Hamilton (New Zealand)]; Tanner, D J [Food Science Australia, North Ryde, Sydney, NSW (Australia)]; Cleland, A C [IPENZ, Wellington (New Zealand)] 42 ENGINEERING; THERMAL CONDUCTIVITY; POROUS MATERIALS To avoid potential misapplication of effective thermal conductivity models, materials that may be described as 'porous' should be divided into two classes; 'internal porosity' materials which have bubbles/pores suspended within a continuous condensed phase (e.g. sponges, foams, honeycombs), and 'external porosity' materials which include granular/particulate materials. It is proposed that the effective thermal conductivity region bounded by the Hashin-Shtrikman bounds may be divided into internal porosity and external porosity regions by the Effective Medium Theory (EMT) equation. The use of the Hashin-Shtrikman and EMT equations as porosity bounds was supported by experimental data from the literature. (author) United Kingdom 2005-05-01 English Journal Article Journal Name: International Journal of Heat and Mass Transfer; Journal Volume: 48; Journal Issue: 11 Medium: X; Size: page(s) 2150-2158 https://doi.org/10.1016/j.ijheatmasstransfer.2004.12.032 [] 11 48 Journal ID: ISSN 0017-9310; IJHMAK; TRN: GB0520566 GB 2010-12-31 20613026