Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 23, Issue 3, Pages 605-614Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1015418218392
Keywords
liquids; open photoacoustic cell; photoacoustic technique; thermal diffusivity
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In this paper the photoacoustic technique in the thermal-wave transmission configuration is applied to thermal diffusivity measurements in liquids. The one-dimensional heat diffusion problem involving three layers, and assuming surface absorption only, is solved for this goal. Linear relations among the photoacoustic amplitude (on a semi-log scale) and phase, as functions of the liquid sample thickness, are shown in each case. An analytical procedure involving linear fits to the experimental data is developed to produce two independent values for thermal diffusivity. The thermal diffusivity of three homogeneous liquids (distilled water, ethylene-glycol, and olive oil) was measured, and excellent agreement was obtained between results from both the amplitude and phase, as well as with thermal-diffusivity values reported in the literature.
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