Heat transfer in channels in parallel-mode rotation at high rotation numbers
Abbreviated Journal Title
J. Thermophys. Heat Transf.
DENSITY RATIOS; CLOSURE; FLOW; Thermodynamics; Engineering, Mechanical
This study attempts to understand one of the most fundamental and challenging problems in fluid flow and heat transfer for rotating machines. The study focuses on electric generators for high energy density applications, which employ rotating cooling channels so that materials do not fail under high temperature and high stress environment. Prediction of fluid flow and heat transfer inside internal cooling channels that rotate at high rotation number and high wall heat flux is the main focus of this study. Rotation, buoyancy, and boundary conditions affect the flow inside these channels. A fully computational approach is employed in this study. Reynolds stress turbulence model with enhanced near-wall treatment is validated against available experimental data (which are primarily at low rotation and buoyancy numbers). The model was then used for cases with high rotation number (as much as 0.35) and high wall heat flux. Particular attention is given to how turbulence intensity, Reynolds stresses, and transport are affected by Coriolis and buoyancy/centrifugal forces caused by high levels of rotation number and wall heat flux. Variations of flow total pressure along the rotating channel are also predicted. The results obtained are explained in view of physical interpretation of Coriolis and centrifugal forces.
Journal of Thermophysics and Heat Transfer
Article; Proceedings Paper
"Heat transfer in channels in parallel-mode rotation at high rotation numbers" (2006). Faculty Bibliography 2000s. 6601.