摘要
为模拟空气分离装置中冷凝蒸发器的实际运行状况，采用１ｍ长的板翅式单元作冷凝蒸发器的微膜热虹吸沸腾通道，使之部分地沉浸在液氮池中进行浅池沸腾试验，实验结果表明，当板翅式单元露出液面部分从０增加到４０ｃｍ时，在整个试样始终保持相同热流密度的条件下，其沸腾传热温差仅增加０．１９Ｋ；只要热流密度维持在某一最小起始值之上，即使沉浸深度减少４０％，冷凝蒸发器仍将处于高效和安全运行状态。
The heat transfer performance of metre long plate-fin unit in a shallow pool with liquidnitrogen was tested.Though the immersion depth of the unit in liquid nitrogen was reducedby 40cm the temperatue difference of boiling heat transfer was increased by 0.19K only, withthe heating power supplied to the whole section of the unit being kept constant.The transienttemperature of the unit in the top position was also measured,with the immersion depth ofthe unit being changed.A fluctuation of temperature in top position of the unit was ob-served.It was found that an automatic compensation for the two phase flow in the flow chan-nel of the unit could be provided by microfilm thermosyphon mechanism,It is concluded thatthe condenser-boiler of an air separation plant will be operated in a safe condition even whenthe immersion is reduced by 40%as long as the heat flux is maintained above a threshold va-lue.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1995年第5期34-38,69,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金
关键词
传热
两相流
浅池沸腾
微膜热虹吸
传热机
heat transfer enhancement two-phase flow shallow pool boiling
