Study of pressure oscillation during noisy film boiling in He II

✍ Scribed by M. Yamaguchi; M. Murakami

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 617 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00078-7

✦ Synopsis

In this paper we study the cause of loud audible noise generation during noisy film boiling in He II. Measurement of the pressure oscillation as well as a visualization study is conducted for this purpose. As a result, it is found that loud audible noise is repeatedly generated at each instance of explosive evaporation of He II which comes into direct contact with an overheated heater surface after a vapour bubble crush. The pressure oscillation measurement over a wide range of hydrostatic pressure also revealed that three film boiling modes appear in He II: boiling in subcooled He II (referred to as subcool boiling); noisy boiling; and silent boiling, as the hydrostatic pressure decreases. However, very close to the h-temperature, subcool boiling makes a direct transition to silent boiling without noisy boiling. Noisy boiling does not appear in subcooled He II, where subcool boiling appears with very weak audible noise of very high frequency.