摘要
在超流氢的沸腾实验中,随着静压液柱高度h的降低,会出现不同的沸腾状态。在噪声沸腾中,一个与平板加热器大小相当的气泡在其表面上反复地长大、缩小,并伴随着巨大的噪声和剧烈的机械振动;在无噪声沸腾中,在平板加热器表面形成一个极稳定的气膜,并且,没有噪声和机械振动出现;而在两者之间,存在一个过渡的沸腾状态。通过沸腾过程中的压力振动测量和可视化测量,对不同沸腾状态进行了研究。
With the decrease of the immersion depth, h, different boiling modes appear in superfluid helium II. A big vapor bubble comparing to the heater size is found to expand and crush on the heater surface accompanied with a loud noise and serve mechanical vibration during noisy film boiling; a stable vapor film is observed on the heater surface without noise and vibration during silent film boiling; and there is transition boiling between noisy and silent film boiling modes. Those boiling modes are studied by the aid of Schlieren visualization method and pressure measurement.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2000年第6期719-723,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目!(No.59876018)
教育部留学回国人员启动基金
上海交大科技基金资助项目
关键词
沸腾实验
超流氦
制冷
压力测量
boiling phenomena
superfluid helium II
pressure oscillation
schileren visu- alization method
dominant frequency