Our simulation engineer Andrea co-authored the paper “Towards the accurate prediction of the turbulent flow and heat transfer in low-Prandtl fluids”, which has now been published in the International Journal of Heat and Mass Transfer.
Andrea published this paper while working as a CFD consultant for the Nuclear Research and consultancy Group (NRG) based in the Netherlands.
In this paper the authors proposed and assessed a novel RANS model for the prediction of the turbulent heat transfer involving low-Prandtl fluids such as liquid metals. These fluids represent an attractive option as a coolant in fast nuclear reactors due to their elevated thermal conductivity and the relatively low neutron moderation. The proposed model relies on an advanced Reynolds Stress Model approach for an accurate resolution of the complex turbulent flow field often encountered in industrial applications. In addition, in order to overcome the well-known limitations of the classical Reynolds analogy in the closure of the turbulent heat flux term, a novel algebraic closure has been employed in this work. The model has been assessed in challenging flow configurations such as an impinging jet and the flow in a bare rod bundle and has shown very encouraging results. Therefore, the proposed model can be regarded as a pragmatic tool in order to obtain accurate predictions in complex industrial flows involving low-Prandtl fluids.