An Energy Fluctuation Approach to Calculate Homogeneous Nucleation Rate in Superheated Liquids and Its Verification by Performing an LPG Rapid Discharge Experiment

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Ting Gao¹  Wensheng Lin¹  Xuesheng Lu¹  Anzhong Gu¹ 

[1] Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University

关键词: Nucleation;    BLEVE;    Bubble;    Energy Fluctuation;    Superheated Liquid;   

DOI  :  10.1252/jcej.10we024

来源: Maruzen Company Ltd

【 摘 要 】

References(17)To investigate conditions that are likely to produce a boiling-liquid-expanding-vapor explosion (BLEVE), the determination of homogeneous nucleation rates of superheated liquids is often crucial. A new approach to estimate nucleation rates of superheated liquids is proposed; the approach is based on the probability distribution of the energy fluctuation within the framework of statistical thermodynamic fluctuation theory. Formulae for calculating the homogeneous nucleation rate in Gibbs canonical ensembles are deduced and tested for some substances. The calculated rates are compared with those obtained by the commonly used kinetic method as well as with experimental values. Finally, the new approach is validated by analyzing pressure rebounds of rapid discharge of pressurized liquefied petroleum gas (LPG). From the pressure rebound conditions, estimates of homogeneous nucleation rates can be obtained with both the kinetic and energy fluctuation approaches. Comparison of calculated results reveals that the new energy fluctuation approach is reasonably effective and has practical relevance in BLEVE research.

【 授权许可】

Unknown