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Thermal Property Measurement of Nanofluid Droplets with Temperature Gradients

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  • Dong-Wook Oh

    (Department of Mechanical Engineering, Chosun University, Gwangju 61452, Korea)

Abstract

In this study, the 3ω method was used to determine the thermal conductivity of nanofluids (ethylene glycol containing multi-walled carbon nanotubes (MWCNTs)) with temperature gradients. The thermal modeling of the traditional 3ω method was modified to measure the spatial variation of thermal conductivity within a droplet of nanofluid. A direct current (DC) heater was used to generate a temperature gradient inside a sample fluid. A DC heating power of 14 mW was used to provide a temperature gradient of 5000 K/m inside the sample fluid. The thermal conductivity was monitored at hot- and cold-side 3ω heaters with a spacing of 0.3 mm. Regarding the measurement results for the hot and cold 3ω heaters, when the temperature gradient was applied, the maximum thermal conductivity difference was determined to be 3% of the original value. By assuming that the thermo-diffusion of MWCNTs was entirely responsible for this difference, the Soret coefficient of the MWCNTs in the ethylene glycol was calculated to be −0.749 K −1 .

Suggested Citation

  • Dong-Wook Oh, 2020. "Thermal Property Measurement of Nanofluid Droplets with Temperature Gradients," Energies, MDPI, vol. 13(1), pages 1-12, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:1:p:244-:d:304874
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    References listed on IDEAS

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    1. Ciro Aprea & Adriana Greco & Angelo Maiorino & Claudia Masselli, 2019. "Enhancing the Heat Transfer in an Active Barocaloric Cooling System Using Ethylene-Glycol Based Nanofluids as Secondary Medium," Energies, MDPI, vol. 12(15), pages 1-15, July.
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    Cited by:

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    2. Gianpiero Colangelo & Brenda Raho & Marco Milanese & Arturo de Risi, 2021. "Numerical Evaluation of a HVAC System Based on a High-Performance Heat Transfer Fluid," Energies, MDPI, vol. 14(11), pages 1-18, June.

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