Experiment on mass diffusion of fluorescent Rhodamine B in Cu-water nanofluids is carried out to investigate enhancement effect of mass transfer in binary nanofluid. An optical experimental system is designed to measure the diffusion coefficient of Rhodamine B in the nanofluid with different nanoparticle volume fractions under different temperatures. The effects of nanoparticles and fluid temperature on mass diffusion inside the nanofluid are discussed from the experimental data. The experimental results show that the diffusion coefficient of fluorescent Rhodamine B in nanofluids is bigger than that in de-ionized water.

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A novel spectral transmittance approach for measuring the extinction coefficient of magnetic fluids is proposed. The measuring principle and accuracy of the approach are analysed. Experiments are conducted to measure the extinction coefficient of magnetic fluids with different particle volume fractions. The relative uncertainty of experimental data is less than 1.8%. The experimental results indicate that the extinction coefficient of magnetic fluids increases with increase of the volume fraction of suspended magnetic nanoparticles and the optical properties of the particle material have a significant effect on the extinction coefficient of the magnetic fluids.

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