NDLI: The ac-Heated Strip Technique for the Measurement of Thermal Properties of Thin, Solid Nonconducting Layers

Content Provider	Springer Nature Link
Author	Atalla, S. R.
Copyright Year	2002
Abstract	The differential equation describing the temperature oscillations generated by a metallic strip of thickness 2L $_{1}$, coated with a thin nonconducting layer of thickness δ and heated by an ac current, was solved with and without reference to the heat transfer by radiation from the outer surface of the coating layer. The solution obtained shows that for L $_{1}$/δ>5, the measurement of the amplitude (and phase) of the temperature oscillations of the strip allows the following thermal properties to be measured: thermal diffusivity (a), volumetric heat capacity (ρC $_{p}$), and thermal conductivity (λ) coefficients of the thin nonconducting layers investigated when the layer thickness is less than the thickness (Λ) at which the temperature oscillations are practically damped in the material of the coating layer (δ<Λ). For thin films (δ≪Λ), a simple formula is obtained which allows the volumetric heat capacity of the film material to be determined alone. On the other hand, when the coating layer is very thick (δ≫Λ), only the thermal activity coefficient (λ/ $$\sqrt a $$ ) can be determined. To test this technique, thin layers of polyethylene and polystyrene were investigated. Bulk specimens were investigated by the ac-heated wire technique. Both sets of results obtained are in good agreement with each other and with published data. The setup described was then used to measure the thermal properties of thin layers of Synthesite AC-43 (440 to 80°C) and Krylon (40 to 160°C). The results are reported. It is worth mentioning that this technique can be used for the estimation of the thickness of opaque thin layers of nonconducting solids, provided that their thermal properties are known. The thermal properties mentioned can be measured applying the ac-heated wire technique, but for bulk material.
Starting Page	253
Ending Page	265
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	23
Issue Number	1
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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