【摘要】 本文实验研究大颗粒流化床中垂直埋管的周向平均传热系数随流化速度和截面高度的变化规律以及垂直埋管的水平位置对传热的影响。实验结果表明,垂直埋管的周向平均传热系数随截面高度增加而减小,而垂直管的水平位置对周向平均传热系数的影响很小。文中还给出了局部管壁温的瞬态变化以及垂直埋管与水平埋管传热的比较。更多还原

【Abstract】 In this paper, circumferentially averaged heat transfer coefficients around a vertical heated tube immersed in a large particle fluidized bed have been measured.The experiments reveal that circumferentially averaged heat transfer coefficients do not change significantly beyond minimum fluidization velocity. They decrease with an increase in the section hight, while tre effect of horizontal position of the vertical tube in the bed on heat transfer coefficients is of minor importance. The instantaneous changes of local tube wall temperature are recorded in the present work.更多还原