209 Heat Transfer Experiments on Dry Storage of Nuclear Spent Fuel
Details
To establish the method for evaluating the heat removal capability in a dry storage facility of nuclear spent fuel, fluid flow and heat transfer characteristics in a turbulent combined-convection boundary layer have been investigated experimentally. Instantaneous velocity and temperature in the boundary layer was measured with normal hot and cold wires, and it was revealed that with increasing in freestream velocity, the turbulent combined-convection flow suddenly changes to laminar one. With transition, a reduction in heat transfer rate and an increase in wall shear stress was observed. In addition, the guideline indicating the occurrence of a laminarization of boundary layer was proposed: Grx/Rex≃3×10^6
