Study on the theory of the mechanism of heat transportation within fine particle powder through the short-term contact

点击翻译按钮获取中文摘要

The purpose of the present study is to determine the mechanism of heat transportation within the fine particle fluidized bed in order to utilize the high performance of heat transfer within the fluidized bed to the temperature control of the powder layer in high response. The establishment of numerical simulation model for the heat transfer within the fluidized bed with fine particle powder has been performed. In the simulation/fine powder was injected into the fluidized bed that was constructed of glass beads with 1 mm in diameter and airflow as fluidizing fluid. The numerical model was constructed using elastic-solid-collide model to investigate the micro-scale heat transfer mechanism. The results of numerical simulation for the wide range of dominating parameter were compared with that of experimental results to confirm the validity of the present simulation. From the experiment and numerical simulation, the powder tends to be kept within the main fluidized bed to form anotherfluidized bed above the main one with an increase in the injection rate of powder. It was elucidated that there was appropriate injection rate of fine powder from the viewpoint of heat transportation. The mechanism of heat transfer within the fluidized bed with fine powder has been determined and the optimum operation conditions for the utilization of fluidized bed to the temperature control of powder layer were extensively determined.