Heat Transfer at Supercritical conditions in Natural Convection EuHIT Funded Project

Team

Gerrit Elsinga
Delft University of Technology, Delft, Netherlands
Martin Rohde
Technische Universiteit Delft, Delft, Netherlands
Stephan Weiss
Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany

Overview

Research Infrastructure
Max Planck High-Turbulence Facility, Germany
Facilities used
High-pressure Convection Facility (GTF2)
Project leader
Valentina Valori
TU Delft, Delft, Netherlands

Abstract

Supercritical fluids are of interest as cooling fluids for a future generation of power plants, which can operate with increased thermal efficiency due to the higher temperature reached in the coolant. Buoyancy has been identified as one of the major causes of heat transfer enhancement or deterioration at supercritical conditions, where the effect of variable properties plays an important role in the heat transfer effectiveness. Therefore, it is important to understand the heat transfer of a supercritical fluid in buoyancy driven flow. With this aim, new heat transfer measurements in a Rayleigh-Bénard cell at supercritical conditions are performed. The results are used to check whether existing Rayleigh and Prandtl number scaling laws defined under subcritical conditions can be extended to predict the heat transfer through the cell at supercritical conditions.