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Using system identification to determine the thermal properties of plastics
Author(s) -
Peter John W.,
Tarvin Ronald L.
Publication year - 1976
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760160402
Subject(s) - materials science , slab , thermal conductivity , a priori and a posteriori , thermal , heat flux , heat flow , mechanics , extraction (chemistry) , thermodynamics , heat transfer , composite material , structural engineering , engineering , physics , philosophy , chemistry , epistemology , chromatography
This article describes a new experimental and analytical method for determining the specific heat and thermal coductivity of plastic materials. This method arrives at these temperature‐dependent properties by analyzing the thermal history of a slab of the plastic material. The procedure is as follows: 1) A partial differential equation model of the heat flow through the slab is established a priori. 2) A varying heat flux is a applied to the slab, and temperature readings throughout the plastic are recorded at fixed time intervals. 3) This temperature data is fed into a digital computer (along with the established mathematical model) and the required specific heat and thermal conductivity values are extracted. The extraction is done by using the maximum likelihood system identification technique.