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Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas & Oil is the property of Editorial Department of Natural Gas & Oil and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Based on Euler-Euler two-fluid model, the gas and liquid flow control equations were established. Combined with the theory of condensation nucleation and droplet growth, the condensation properties of CO2 in a Laval nozzle were simulated. The results showed that both the mathematical models and numerical calculation methods used could reflect the process of gas condensation in the Laval nozzle accurately. The condensation wave of CO2 was not obvious due to its small latent heat of condensation. As the gas flow into the nozzle, the Mach number increased while pressure and temperature decreased, the undercooling increased up to 30 K, and then declined quickly to about 5 K after the occurrence of condensation. The process of nucleation showed a sharp both in time and space. Wilson point is about 2. 21 mm from the throat, the nucleation rate increased sharply from 0 to 2. 04 X 1021 m-3 • s-1 , while the number of droplets reached the order of 1015 instantly. After the formation of condensation core, gas molecules under certain degree of undercooling accumulated and liquefied on the droplets surface, causing droplet radius as well as humidity to increase rapidly. After the process of nucleation, the existing coagulation cores kept growing with the mathematical models and numerical calculation methods used could reflect the process of gas condensation in the Laval nozzle accurately. The condensation wave of CO2 was not obvious due to its small latent heat of condensation. As the gas flow into the nozzle* the Mach number increased while pressure and temperature decreased, the undercooling increased up to 30 K, and then declined quickly to about 5 K after the occurrence of condensation. The process of nucleation showed a sharp both in time and space. Wilson point is about 2. 21 mm from the throat, the nucleation rate increased sharply from 0 to 2. 04 X 1021 m-3 • s-1 , while the number of droplets reached the order of 1015 instantly. After the formation of condensation core, gas molecules under certain degree of undercooling accumulated and liquefied on the droplets surface, causing droplet radius as well as humidity to increase rapidly. After the process of nucleation, the existing coagulation cores kept growing with the droplet radius increasing to 1. 46 X 10-7 m and the humidity up to 0. 093 5 at the exit of the Laval nozzle. [ABSTRACT FROM AUTHOR]

The study of condensation for high-speed expansion gas is still on the stage of exploration, and the popular nucleation model may be Internally Consistent Classical Theory (ICCT). However, satisfied results can be gained for real-gas in low temperature. As far as theory's defects. the model is modified as follows: computing chemical potential difference with fugacity and using Tolman model to solve the relation between droplet curves and surface tension; SRK and LD formula were recommended respectively for state equation and surface tension in low temperature. Compared the modified model and ICCT model with the experiment data, it is found that ICCT predictive value is higher than experiment value about 3 - 4 order of magnitude while deviation of modified model can be reduced to 1 - 2 order of magnitude, especially for alkane the deviation under 1 order of magnitude. For modified model, more satisfied results can be gained, it can be recommended as standard formula for the study of nucleation. [ABSTRACT FROM AUTHOR]

Copyright of Research & Exploration in Laboratory is the property of Research & Exploration in Laboratory and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)