Contact Photothermal Techniques for Thermal Characterization of Liquids

Authors

  • D.Dadarlat National R&D Institute for Isotopic and Molecular Technologies, Donat Str. 67-103, Cluj-Napoca 5, 400293, Romania

DOI:

https://doi.org/10.15377/2409-5826.2014.01.01.2

Keywords:

Photothermal phenomena, photopyroelectric calorimetry, photothermoelectric calorimetry, liquids, thermal parameters.

Abstract

Two contact photothermal (PT) techniques, the well-known photopyroelectric (PPE) calorimetry, and a recently introduced photothermoelectric (PTE) one, are proposed for thermal inspection of some liquid samples. The paper contains a summary of the recent results and a comparison of the investigations performed with the previously mentioned techniques for the measurement of the dynamic thermal parameters (thermal diffusivity and effusivity) of some liquids of interest: magnetic nanofluids with transformer oil as carrier liquid and various concentrations of magnetite (Fe3O4) nanoparticles. For both techniques, the same detection configurations have been used: (i) the front detection configuration, together with the thermal-wave resonator cavity (TWRC) method as scanning procedure, was used to measure the value of thermal effusivity; (ii) the back configuration, together with the same TWRC technique, leads to the direct measurement of thermal diffusivity. The main theoretical aspects of the particular detection cases for both techniques are described and the performances (advantages and limitations) of the methods are analyzed. Concerning the nanofluid under investigation, small increases of thermal diffusivity (9.33 m2s-1 – 10.33 m2s-1) and effusivity (450 Ws1/2 m-2K-1 – 530 Ws1/2 m-2K-1) with increasing nanoparticles’ concentration (0.156 mg(Fe3O4)/ml fluid - 0.623 mg(Fe3O4)/ml fluid) are observed.

Author Biography

D.Dadarlat, National R&D Institute for Isotopic and Molecular Technologies, Donat Str. 67-103, Cluj-Napoca 5, 400293, Romania

Department of Molecular and Biomolecular Physics

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Published

2014-10-17

How to Cite

1.
D.Dadarlat. Contact Photothermal Techniques for Thermal Characterization of Liquids. J. Adv. Therm. Sci. Res. [Internet]. 2014Oct.17 [cited 2021Sep.26];1(1):9-14. Available from: https://www.avantipublishers.com/jms/index.php/jatsr/article/view/86

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