Study on heat transfer behavior of a cylindrical particle bed with volumetric heating

Wen, J.*; Kamada, Yuto*; Yokoyama, Kosei*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Imaizumi, Yuya ; Tagami, Hirotaka ; Matsuba, Kenichi  ; Kamiyama, Kenji  

The influence of water pool height, particles diameter and wall cooling on particle bed-water pool heat transfer was evaluated by assessing the time variation of average temperatures of the particle bed and water pool, and their difference. The concept of macroscopic heat transfer coefficient of the particle bed-water pool system was introduced to elucidate the intensity of natural convection. The results show that the time variation of temperature difference initially increases, peaks, and then decreases. Based on this phenomenon, the process of heat transfer of the particles bed-water pool system was explained. According to the result, the water pool height and particle diameter will affect the heat transfer, but the current cooling conditions have little influence on the heat transfer of the particle bed.