Document Type : Research Article
Authors
Engineering Department, Shahid Beheshti University, G.C, P. O. Box 1983963113, Tehran, Iran
Abstract
In this analysis, nanofluid properties are evaluated by interaction correlations between particles using molecular dynamics (MD) method, and thermal-hydraulics characteristics of nanofluids in a WWER-1000 reactor is investigated by Computational Fluid Dynamics (CFD). This study conceptualizes power increase by changing the cooling from pure water to nanofluid without changing the safety parameters. The Copper nanoparticles are used in primary loop cooling system, to evaluate the heat removal from the core. Thermophysical properties such as thermal conductivity and shear viscosity of Cu-Water nanofluids are obtained by MD in operating pressure and temperature of the Bushehr reactor core. These properties have been used in thermal-hydraulics analysis and nanofluids are considered as a homogeneous fluid. Thermal hydraulic properties of coolant have been calculated for different volume fractions of nanofluids. Thermal hydraulic simulation illustrated enhancement of the thermal characteristics of the core, due to the increment in heat transfer coefficient and thermal diffusivity. The thermal-hydraulic analysis of the reactor core has been performed in steady state at different powers. The requirements for changing the reactor power are not to change the fuel center temperature and Outer Cladding Surface temperature compared to the current state.
Highlights
- The Molecular Dynamics and CFD methods are used for thermal hydraulics analysis of nanofluids.
- Using Molecular Dynamics, the required thermophysical properties are calculated in high pressure and temperature.
- Copper-Water nanofluid properties such as thermal conductivity and shear viscosity are calculated using MD method.
- The thermal-hydraulics of nanofluids in a WWER1000 reactor have been obtained by CFD method.
- The safety parameters of fuel and cladding are calculated by the Finite Difference Method.
Keywords
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