A study of external heat exchange between the vibrofluidized bed surface and the coolant gas in devices used for spent nuclear fuel regeneration

• Published in: Journal of physics. Conference series 2017-10, Vol.891 (1), p.12002
• Main Authors: Sapozhnikov, B G, Gorbunova, A M, Zelenkova, Yu O, Shiriaeva, N P
• Format: Article
• Language: English
• Subjects: Coolants; Flow velocity; Gas flow; Heat exchange; Heat transfer; Nuclear fuels; Particle size; Physics; Recrystallization; Regeneration; Simulators; Spent nuclear fuels
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/891/1/012002

The oxidative recrystallization of spent nuclear fuel running in the vibrofluidized bed mode requires a continuous supply or removal of heat, which can be performed using various techniques. The most advantageous of these is supplying a coolant gas over the surface of the vibrofluidized bed. However, the available information about such heat exchange processes is limited. External heat exchange between the surface of the vibrofluidized bed and the blown coolant gas was investigated using fuel simulators, which construction was based on narrow-fraction electrocorundum exhibiting the particle size of dP = 0,07 ÷ 1,25 mm in a device with the diameter of 100 mm and the height of 160 mm according to a stationary technique. The data on the influence of the coolant flow, the amplitude and frequency of vibration, as well as the particle size of the dispersed material were obtained. In order to explain the results obtained, we used data on the pulsations of the gas flow velocities occurring in the vibrofluidized bed and depending on the parameters listed above.