学术
高压密相流体中超声空化现象的研究
罗登林[1] 聂英[1] 丘泰球[2]
[1]河南科技大学食品与生物工程学院,洛阳471003 [2]华南理工大学轻工与食品学院,广州510640
摘 要:
利用空化测试材料研究了超声在高压密相流体CO2中的空化效应,并从理论上进行了分析。实验发现在相同功率的超声作用下,空化测试材料在高压液体CO2中能产生明显的空洞,但在超临界CO2无空洞产生,说明超声能在高压液体CO2（亚临界）产生超声空化现象,而不能在超临界CO2中产生空化现象。理论分析表明,当CO2处于高压液体状态时,由于CO2具有很高的蒸汽压,抵消了外界的高压,因此超声能够产生空化效应;而当CO2处于超临界状态时,由于体系不存在汽-液界面,因此阻碍了空化现象的产生。[著者文摘]
文章出处:
《声学技术》-2007年26卷4期 -651-654页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-3630（2007）-04-0651-04
Ultrasonic cavitation in high-pressure and dense-phase fluids
LUO Deng-lin, NIE Ying, QIU Tai-qiu （1. Food ＆ Bioengineering College, Henan University of Science and Technology, Luoyang 471003, China; 2. College of Light Chemistry and Food Science, South China University of Technology, Guangzhou 510640, China）
Abstract:
With the cavitation test material, ultrasonic cavitation in high-pressure and dense-phase fluids was explored and the theoretic deduction was probed. According to the experimental results, at the same power of ultrasound, the cavitation test material shows many pores in high-pressure liquid CO2, whereas, it did not appears in supercritical CO2. This phenomena shows that ultrasound can generate cavitation in high-pressure liquid CO2 （subcritical station）, but not in supercritical CO2. Based on theoretic deduction, ultrasound can generate cavitation in high-pressure liquid CO2 due to high vapor pressure of CO2, reduced the external pressure influence. However, there are no liquid-gas phase boundaries in the supercritical CO2, hence prohibiting cavitation.[著者文摘]
Key words:
ultrasound; dense-phase fluids; carbon dioxide; cavitation
基金资助:
河南科技大学人才科学研究基金资助
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