Abstract
We investigated the thermal effusivity of silver nanofluids using a microwave technique. During microwave irradiation, silver nanoparticles with a narrow particle size distribution were formed in water and in ethylene glycol, with a polyvinylpyrrolidone stabilizer. We designed and used a front-photopyroelectric technique that employed a metalized polyvinylidene difluoride (PVDF) pyroelectric sensor, with a thermally thick sensor and sample. Using this technique, we calculated the thermal effusivity of the silver nanofluids at a given frequency using the combination of the signal’s normalized amplitude–phase. The thermal effusivity of the nanofluids increased with the number of microwave irradiation cycles, which increased the nanoparticle concentration in the base fluids. A comparison with reported values illustrates the high accuracy obtained from the results of thermal diffusivity, the thermal effusivity of the PVDF sensor, and the thermal effusivity of ethylene glycol as a base fluid (differing by only 1.7 %, 0.5 %, and 2.3 %, respectively). Our method can therefore be used to study nanofluids with varying nanoparticle properties, such as concentration, size, and shape.
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The authors are grateful to the Ministry of Science, Technology and Innovation for supporting this work under Fundamental Research Grant No. 01-02-13-134FR.
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Noroozi, M., Zakaria, A., Radiman, S. et al. A Simple Investigation of the Thermal Effusivity of Silver Nanofluid Using Photopyroelectric Technique. Int J Thermophys 37, 84 (2016). https://doi.org/10.1007/s10765-016-2093-6
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DOI: https://doi.org/10.1007/s10765-016-2093-6