Our simulation engineer Andrea co-authored the paper “Status and perspectives of turbulent heat transfer modelling in low-Prandtl number fluids“, which has now been published in Nuclear Engineering and Design.
Andrea published this paper while working as a CFD consultant for the Nuclear Research and consultancy Group (NRG) based in the Netherlands. The paper was the result of a collaborative research effort including also the Von Karman Institute for Fluid Dynamics and ASCOMP GmbH carried out in the framework of the EU-funded SESAME project.
In the paper the authors have assessed several advanced closures for the turbulent heat transfer with low Prandtl number fluids. Such fluids include liquid metals, that are foreseen as a primary coolant in Generation IV nuclear reactors. Liquid metal thermal-hydraulics is a key issues in the development of such reactors, and the availability of reliable numerical models is seen as of paramount importance to overcome such issues. Standard models for the turbulent heat flux such as the Reynolds analogy are not suitable for non-unity Prandtl fluids; therefore, one on the main goals of the SESAME project was the development and assessment of more advanced, but yet pragmatic, turbulence models against novel numerical and experimental. This paper analyses the performance of the different models in forced, mixed and natural convection with low-Prandtl working fluids and explores possible ways forward for further model development.