空间科学学报2017，Vol.37Issue(4)：455-467,13.DOI:10.11728/cjss2017.04.455
微重力下加热面尺寸对气泡动力学行为的影响
Influence of Chip Size on Bubble Dynamic Behavior in Microgravity
摘要
Abstract
In order to study the influence of chip size on bubble dynamic behavior in microgravity,the factor of chip size on bubble dynamics under various heat fluxes has been studied by comparison experiments.Typical isolated bubble boiling maintains on both small and large size chips in low heat flux,and the growth and coalescence rates of bubbles are relatively slow.The volume of bubble on large size chip is about 3.4 times that of the bubble on small size chip.The bubble departure could only be observed on the large chip during the experiment.Fully developed nucleate boiling are sustained in the case of moderate heat flux,the coalescence and departure frequency of bubbles is much higher than that in low heat flux,especially on large size chip.Bubbles detach more frequently on large size chip than that on small size chip.Moreover,the wake effect caused by bubble rising reduces the departure diameter of subsequent bubbles,so the formation of dry portions is effectively suppressed.For the high heat flux,obvious film boiling presents on the small size chip and the deterioration of heat transfer is observed.However,stable nucleate boiling still maintains on large size chip in the high heat flux,only the bubbles coalesce and detach more frequently.Therefore,increasing the chip size can effectively promote the bubble departure and improve critical heat flux.Film boiling is also observed as the heat flux on larger size chip is increased beyond the critical heat flux,but the heating surface could not be completely covered by the bubble,just sliding slowly on the slip,which can reduce the rising rate of temperature on chip effectively.关键词
芯片尺寸/微重力/临界热流密度/气泡动力学行为/池沸腾/传热Key words
Chip size/Microgravity/Critical heat flux/Bubble dynamic behavior/Pool boiling/Heat transfer分类
能源科技引用本文复制引用
齐宝金,魏进家,王雪丽,赵建福..微重力下加热面尺寸对气泡动力学行为的影响[J].空间科学学报,2017,37(4):455-467,13.基金项目
国家自然科学基金资助项目(51306141,51225601)和教育部高等学校博士学科点基金项目(20120201120068)共同资助 （51306141,51225601）
