Abstract
The optical properties (absorption, transmittance, scattering, and extinction coefficient) based on metal, metal oxide, carbon nanotubes, graphite, and graphene for the variation of particle size and shape, path depth, and volume fraction are compiled in this chapter in detail. It was observed from the literature that optical solar absorption of nanofluid increased with increasing nanoparticle size and volume concentration. There were some conflicting results on the effects of nanoparticle size on absorption, in which the particle size has an insignificant effect on overall optical properties. Moreover, it was observed that path depth has some remarkable effects over optical absorption of nanofluids. The transmittance of nanofluids has an indirect relation with nanoparticle size, volume fraction, and path depth. The scattering of light is directly proportional to the volume concentration and particle size of metallic particles. Overall, the results of various elements showed that the presence of large particles and particle agglomerates leads to a significant amount of light scattering. As a result, the overall extinction coefficient will be increased. Therefore, an optimization of these properties needs to be maintained for better output.
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