用淬冷法确定饱和液氮中的池沸腾热流密度曲线

Determination of pool boiling curves in saturatednitrogen by quenching method

用直径为５０ｍｍ、厚度为１２ｍｍ的铜平板在液氮中进行了不同热面方位角的淬冷沸腾实验，各方位角为θ＝０°（热面向下）、１０°、２０°、３０°、５０°和９０°（热面垂直）；随着方位角的增加，临界热流密度、最小膜态沸腾热流密度及其壁面过热度相应地增加，且在方位角θ＜３０°时，θ对上述参数的影响更大；得出ｑＣＨＦ、ｑｍｉｎ与方位角的关系式．

Quenching experiments of inclined and downwardfacing copper flat plates of 50mm in diameter and 12mm in thickness in saturated nitrogen were performedInclination angles investigated are 0°(downward facing),10°,20°,30°,50° and 90°(vertical).As the inclination angle is increased,both qCHE and qmin and their corresponding wall superheat increase accordinglyThe influence of inclination on boiling curves is more pronounced below 30°.Finally,the values of qCHF and qmin are given as functions of the inclination angle