Investigation on optical theoretical models of SiO2 nanofluids

Abstract

Abstract-Photovoltaic and photovoltaic heat technology can be coupled by nanofluid-based solar direct absorption thermal collector. It is an important means to improve the efficiency of comprehensive utilization of solar energy. Nanofluids optical theory plays an important role in the development of new photovoltaic-thermal experimental platform. In addition, study on optical characteristics of nanofluids is still in the initial stage. As a result, it is of great significance for the study of the law and mechanism of it. In this paper, the Rayleigh scattering model and the Mie scattering model are used to analyze the critical optical characteristics --transmittances of the nanofluids. Furthermore, the consistency between different theoretical models and experimental datum is studied by contrast verification between experiments and theory calculation. The conclusion shows that Mie scattering model performs better than Rayleigh scattering model and expresses a better applicability in the development of photovoltaic thermal experimental platform. This theoretical study on optical characteristics of nanofluids is expected to prompt on the application of nanotechnology in the field of solar energy. It is also expected to improve the efficiency of comprehensive utilization of solar energy.

Experimental investigation on low concentration nanofluids with Fresnel lens and evacuated tubes for solar applications

“…Said et al. and Huang et al 39,41 . reported the optical properties like extinction, absorption, and scattering coefficients of nanofluids using Mie scattering and Rayleigh scattering approaches analytically by considering the particle size parameters.…”

“…Said et al and Huang et al 39,41 reported the optical properties like extinction, absorption, and scattering coefficients of nanofluids using Mie scattering and Rayleigh scattering approaches analytically by considering the particle size parameters. Said et al 39 reported a huge difference between experimental and analytical values of optical properties for alumina and TiO 2 nanofluids in the UV region.…”

Surface and optical properties of ethylene glycol-based nanofluids containing silicon dioxide nanoparticles: an experimental study

“…Despite the great interest in the thermophysical properties of nanofluids containing SiO 2 , there is lack of information about their optical properties designated in the experimental way. However, in some publications, this topic is presented from the theoretical perspective [39,40]. The obtained results of refractive index, n, analyzed for SiO 2 -EG nanofluids with different concentrations of nanoparticles are summarized in Table 2.…”

Study of Light Scattering by TiO₂, Ag, and SiO₂ Nanofluids with Particle Diameters of 20-60 nm

“…They have also used the Beer-Lambert law to approximate the transmission of light through a layer of nanofluid instead of the MC method. Huang, Bai and Luo Huang, Bai and Luo [16] have also investigated the theoretical optical properties of silicon dioxide nanoparticles using Mie's theory. Their modelling approach is similar to that of Tan et al [17], but Huang, Bai and Luo [16] have included the properties obtained using the Rayleigh scattering model, which assumes that the size of the nanoparticles are much smaller than the wavelength of incident radiation.…”

“…Using Eqs. (16)(17)(18)(19), the properties of the nanofluid may be found by combining the properties of the base fluid and the nanoparticles. The equations below apply.…”