مشخصات پژوهش

The utilization of nanofluids to enhance heat transfer has garnered attention across diverse industries. This study delves into the thermal properties of ZnO/DI-Water nanofluids, exploring variations in nanoparticle volume fractions, sizes, and shapes. Employing an innovative micro-cell simulation method, nanoparticles with dimensions of 50 and 70 nm are dispersed within nanofluid micro-cells at volume fractions of 0.5%, 1%, and 1.5%. Additionally, the impact of non-spherical particles is investigated through nanofluids containing ellipsoidal particles with a significant 75 nm diameter. Thermal conductivity and specific heat coefficients, fundamental thermal characteristics of nanofluids, are extracted via micro-cell simulations. These parameters are integrated into a numerical model of a heat exchanger, enabling the analysis of temperature reduction and convection coefficient fluctuations within the system. Notably, nanofluids featuring 50 nm particles exhibit temperature reductions 13.5% and 20% higher than spherical and ellipsoidal 75 nm particles, respectively. Furthermore, convection coefficient disparities exceeding 25% are observed within nanofluids containing 50 nm particles. Empirical validation demonstrates the numerical model's efficacy, yielding a 13.43% average error in predicting nanofluid thermal properties. In summary, this study contributes valuable insights into the intricate relationship between nanoparticle attributes and resultant heat transfer phenomena. The implications extend to industries seeking optimized thermal management solutions, offering guidance for enhanced heat exchange processes.