|
|||||
|
|
| 超声强化近临界CO_2流体萃取的机理 | |
| 引用本文： | 李超,丘泰球,王卫东,高兆建,程志彪.超声强化近临界CO_2流体萃取的机理[J].江苏大学学报(自然科学版),2009,30(5). |
| 作者姓名： | 李超 丘泰球 王卫东 高兆建 程志彪 |
| 作者单位： | 1. 徐州工程学院,食品工程学院,江苏,徐州,221008;华南理工大学,轻工与食品学院,广东,广州,510640 2. 华南理工大学,轻工与食品学院,广东,广州,510640 3. 徐州工程学院,食品工程学院,江苏,徐州,221008 |
| 摘 要： | 借助近临界CO2流体中超声空化阈值的基本计算,首先理论上探讨了近临界CO2流体中超声空化阈值随空化泡核初始半径的变化规律,然后应用该规律判断超声能否在近临界CO2流体中产生空化现象,从而揭示超声强化近临界CO2流体萃取的机理.结果表明:近临界CO2流体中超声阈值随空化泡核初始半径的增大而减少,即在其他条件相同的情况下,空化泡核初始半径较大时,超声在近临界CO2流体中产生空化现象相对容易;当近临界CO2流体温度20 ℃、压力5.82 MPa时,超声能在近临界CO2流体中产生空化现象,此时超声强化近临界CO2流体萃取的机理包含空化效应和机械效应;相反,当近临界CO2流体温度20 ℃、压力8 MPa时,超声不能在近临界CO2流体中产生空化现象,此时超声强化近临界CO2流体萃取的机理仅包括超声波的机械效应. |
| 关 键 词： | 超声 近临界CO2流体 机理 |
Mechanism of ultrasound-enhanced near-critical CO_2 fluid extraction |
|
| Li Chao,Qiu Taiqiu,Wang Weidong,Gao Zhaojian,Cheng Zhibiao.Mechanism of ultrasound-enhanced near-critical CO_2 fluid extraction[J].Journal of Jiangsu University:Natural Science Edition,2009,30(5). | |
| Authors: | Li Chao Qiu Taiqiu Wang Weidong Gao Zhaojian Cheng Zhibiao |
| Institution: | 1.College of Food Engineering;Xuzhou Institute of Technology;Xuzhou;Jiangsu 221008;China;2.College of Light Industry and Food Sciences;South China University of Technology;Guangzhou;Guangdong 510640;China |
| Abstract: | The theory of cavitation threshold of ultrasonic in near-critical CO2 fluid with original radius of cavitation bubble was firstly discussed by the basic calculation of cavitation threshold of ultrasonic in near-critical CO2 fluid.Then the theory was applied in judging the occurrence of cavitation in near-critical CO2 fluid.Thus,the mechanism of ultrasound-enhanced near-critical CO2 fluid extraction(UCCFE) was disclosed.The results show that cavitation threshold of ultrasonic increases with the rise of origi... |
| Keywords: | ultrasound near-critical CO2 fluid mechanism |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |