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Thermal diffusivity measurement of Au nanofluids of very low concentration by using photoflash technique

机译：使用照相闪光技术测量极低浓度的金纳米流体的热扩散率

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摘要

In this paper, the application of photoflash technique to measuring the thermal diffusivity of gold nanofluids of very low concentration at room temperature was presented. The nanofluid samples were prepared from the pulse laser ablation procedure. The thermal diffusivity was obtained by fitting the theoretical temperature signal to the experimental data, and it was found to increase linearly from 1.47 × 10~(-3) cm~2 s~(-1) to 1.68 × 10~(-3) cm~2 s~(-1) as the concentration increased from 1.11 mg/L to 3.18 mg/L. The increase in thermal diffusivity in these multidispersed nanofluids was attributed to the higher nanoparticle concentration as well as to the increasing presence of the smaller size nanoparticles.
机译：本文介绍了光闪技术在室温下测量浓度很低的金纳米流体的热扩散率的应用。通过脉冲激光烧蚀程序制备了纳米流体样品。通过将理论温度信号拟合到实验数据获得热扩散率，发现其从1.47×10〜（-3）cm〜2 s〜（-1）线性增加至1.68×10〜（-3）随着浓度从1.11 mg / L增加到3.18 mg / L，cm〜2 s〜（-1）。这些多分散的纳米流体中热扩散率的增加归因于较高的纳米颗粒浓度以及较小尺寸的纳米颗粒的存在增加。

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