Thermo-Hydraulic Investigation of Nanofluid as a Coolant in VVER-۴۴۰ Fuel Rod Bundle

The main purpose of this study is to perform numerical simulation of nanofluids as the coolant in VVER-۴۴۰ fuel rod bundle. The fuel rod bundle contains ۶۰ fuel rods with length of ۹۶۰ mm and ۴ spacer grids. In VVER-۴۴۰ fuel rod bundle the coolant fluid (water) is in high pressure and temperature condition. In the present Thermo-hydraulic simulation, water-AL۲O۳ nanofluids containing various volume fractions of AL۲O۳ nanoparticles are investigated. Calculations performed for Reynolds number of ۱۲۵۰۰۰ to ۲۰۳۰۰۰, nanoparticles fraction of ۰ to ۰.۰۵ and nanoparticles diameter of ۲۰ to ۱۰۰ nm. In this literature, the effects of diameter and volume fraction of nanoparticles on thermo-hydraulic parameters are studied. To perform correct calculation, different grid qualities of fuel rod bundle are studied and results are compared with reference results. Empirical studies show that as the temperature rises, the effect of nanoparticles on enhancing thermal conductivity intensifies. So it can be said that as the VVER-۴۴۰ fuel rod bundle works in high temperature condition, using the nanofluids in this rod bundle can be effective. Results of our numerical study showed that by using nanofluids as coolant fluid the heat transfer coefficient increases significantly and heat transfer enhancement raises with increase in volume fraction of nanoparticle.

Keywords:

Heat transfer coefficient , Nanofluid , Particle diameter , Rod bundle , Volume fraction