Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Journal of Xi'an Jiaotong University》 2018-09
Add to Favorite Get Latest Update

Investigation on the Boiling Bubble Departure Behavior of Cryogenic Fluid in Microgravity

MA Yuan;SUN Peijie;LI Peng;WANG Lei;LI Yanzhong;School of Energy and Power Engineering,Xi'an Jiaotong University;Shanghai Institute of Aerospace System Engineering;  
The investigation on the bubble dynamics and departure characteristics in microgravity is the foundation to reveal the mechanism of boiling heat transfer under microgravity.Under microgravity,bubbles present different behaviors from that in normal gravity condition because of the comprehensive effects of several weak forces.Analyzing the force on a single hydrogen bubble on the plate heating surface and considering the Marangoni effect under microgravity,the bubble departure diameters are calculated for different gravities,pressures,fluid subcooling degree,and superheating degree of the wall.Results show that there might be three bubble departure diameters when the gravity is lower than a certain value,and the biggest departure diameter could increase to tens of centimeters as the gravity decreases.However,the bubble departure diameter in ground gravity is only at the scale of 0.01-0.1 mm,which shows that the effects of pressureon the bubble departure diameter are obviously different in normal and micro gravities.The bubble departure diameter declines in normal gravity,but the biggest departure diameter increases with the pressure in microgravity.Under microgravity,the lower the fluid temperature(means higher subcooling degree),the greater the biggest bubble departure diameter.The biggest departure diameter increases by about 10% with a 1 Kincrease of the subcooling degree.Under a certain microgravity,there is a critical wall superheating degree,and the existence of three different departure diameters depends on whether the wall superheating degree reaches the critical value.Higher pressure and lower liquid temperature result in lower critical superheating degree.
【Fund】: 国家自然科学基金资助项目(51376142);; 航天低温推进剂技术国家重点实验室开放基金资助项目(SKLTSCP1810);; 陕西省博士后科研资助项目
【CateGory Index】: V434.1
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved