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5/16/2017  |   4:55 PM - 5:20 PM   |  2

Investigations on the effect of radiation dependent parameter on effective thermal conductivity of two-phase materials

Two-phase materials are based on the principle of self-assembly of micro and macro-structures and consist of two distinct phases namely continuous and dispersed. In this study, effective thermal conductivity of two-phase materials is estimated based on the modified unit cell collocated parameter model by including secondary radiation effects at high temperatures. Algebraic expressions are derived for touching and non-touching two and three-dimensional spatially periodic in-line geometries based on electric resistance analogy approach. The model is used to predict thermal conductivity of various two-phase materials of wide range of conductivity ratios (? < 1000) and concentration (less than or equal to 1) at various temperatures. The unit cell model is validated with experimental results using a Square Guarded Hot Plate (SGHP) apparatus in the temperature range of 323 - 723 K with temperature difference of 20 K imposed across the specimen. A combined measurement uncertainty of ± 6.75 % is obtained from analysis of measurement data acquired from experiments. Reasonable agreement with experimental data for low thermal conductivity materials is achieved with a maximum deviation of ± 6.82 % at low temperatures and ± 10.68 % at high temperatures. Similarly for high thermal conductivity materials, a deviation of ± 9.82 % and ± 12.68 % is observed for low and high temperatures respectively when compared against published experimental data.

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K S Reddy (POC,Primary Presenter,Author), Indian Institute of Technology Madras, Chennai-36, India, ksreddy@iitm.ac.in;
jayachandran s (Co-Presenter,Co-Author), Indian Institute of Technology Madras,Chennai-36,India, jay_thermal@yahoo.co.in;






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