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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

A NEW FIN MODEL ON IN-PLANE THERMAL DIFFUSIVITY MEASUREMENT OF THIN FILMS BY THE FLASH METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.023763
pages 8890-8897

Аннотация

The flash method has been extended to measure thermal diffusivity in the radial direction of free-standing thin films with substantial surface heat losses. A small doughnut shape portion of the front surface of the sample is exposed to the laser light and the resulting temperature rise is recorded on a small radius area on the opposite side of the sample. The thermal diffusivity is calculated using a new mathematical model based on so called "fin approximation", when the axial temperature gradient in the sample is negligibly small in comparison with the radial gradient. The technique was experimentally verified on OFHC Copper foils of available thicknesses ranging from 25 μm to 0.5 mm. Results show that in-plane thermal diffusivity of thin film samples can be measured without accounting for actual sample thickness.