摘要
本工作对由直径为8mm的表面氧化后的碳钢球组成的填充床中的流动沸腾传热进行实验研究。通过逐步增加和减小热流密度的方式来控制沸腾起始与沸腾强度,监测到发生在填充床中的沸腾迟滞现象,研究了填充床中各种沸腾迟滞现象随着填充床内不同轴向和径向位置、表观流速等因素的变化规律。实验表明:高流速、远离出口、靠近管壁的情况不易出现成核滞后;增大表观流速、填充物表面粗糙度可增大沸腾湮灭滞后程度。
The boiling heat transfer on packed bed with 8 mm carbon steel balls was investigated . The boiling curves were obtained at the increasing and decreasing conditions of heat flux , which made it possible to detect the boiling hysteresis phenomena .The various factors which impact on the boiling hysteresis in the channels , such as the axial and radial positions in the test section ,the superficial flow velocity etc .,were investigated .The experimental results show that the nucleation hysteresis is weak at high liquid velocity ,far from the outlet and near wall situations .When liquid superficial velocity and surface roughness of the fillers increase , the degree of annihilation hysteresis of boiling increases .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2013年第10期1782-1786,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(11075042)
关键词
沸腾滞后
沸腾起始
填充床
boiling hysteresis
boiling incipience
packed bed
