Erosion in Liquid Cooling Systems: Investigating Velocity-Dependent Degradation Mechanisms

This study defines test parameters to assess if the 1.5 m/s velocity limit is accurate to prevent erosion-corrosion in IT cooling systems. Corrosion results from electrochemical metal degradation, while erosion is mechanical damage due to high-velocity fluid impact. Erosion-corrosion combines both, accelerating material loss. The experiment evaluates mass loss and surface roughness to determine the critical velocity at which damage rapidly increases. Copper coupons will be exposed to PG25 coolant under controlled conditions, measuring weight and surface roughness changes. Wall shear stress (WSS) is a key factor in erosion-corrosion influencing mass transfer of corrosive species. City water velocity guidelines exist but may not apply to IT cooling. This study simulates impinging jet flow to establish whether current limits are valid. Data will guide optimal velocity thresholds for liquid cooling without unnecessary restrictions, ensuring efficiency while minimizing material degradation.