Читать книгу Nano-Technological Intervention in Agricultural Productivity - Javid A. Parray - Страница 34

The thermal conductivity of NP metals is known to be higher than that of stable fluids. For example, the thermal copper conductivity is about 700 times higher than water and approximately 3000 times higher than engine oil at room temperature. In addition, alumina oxides (Al₂O₃) are thermally more thermally capable than water. Fluids containing solids suspended with higher thermal conductance should therefore be substantially higher than conventional heat transmission fluid. Dispersing the nanometric scales solid particles into liquid such as water, ethylene glycol or oils produces nanofluids. Dispersed nanometric scale nanofluids are supposed to exhibit superior propensities compared to conventional heat transfer fluids and fluids containing microscopic particles. As this thermal transfer occurs on the particles' surface, it is essential to use particles with a large overall surface region. The wider total area also improves the stability of the suspension [73]. It has recently been shown that advanced thermal conductivity is exhibited by nanofluids consisting of CuO or Al₂O₃ NPs in water or ethylene [74].