TED-AJ03-605 A NEW APPROACH TO HOMOGENEOUS NUCLEATION RATE IN SUPERHEATED LIQUIDS AND ITS VERIFICATION IN LPG VAPOR EXPLOSION PROCESS

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概要

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• Boiling liquid expanding vapor explosion (BLEVE) occurs when there is a sudden loss of containment of a pressure vessel containing a superheated liquid or a liquefied gas. The resulting thermal radiation is intense and has the potential to cause severe health-damage even loss of life as well as other material damage. When a liquefied gas is depressurized rapidly, it becomes highly superheated. Consequently, a great deal of bubbles generated homogeneously in the bulk liquid, and the liquid vaporize violently. The higher the superheat, the larger the number of bubbles generated. Obviously, it is crucial to determine the homogeneous nucleation rate in a superheated liquid in order to investigate the BLEVE process. Traditionally, this is decided with the kinetic approach. A new hypothesis for predicting homogeneous nucleation rate in superheated liquids is proposed according to the probability distribution of energy fluctuation in statistical thermodynamic fluctuation theory. The number of systems that nucleation takes place in an ensemble is supposed to be decided by the probability that the energy fluctuation in the ensemble achieve the work needed to form a stable nucleus. Formulae for calculating the homogeneous nucleation rate in Gibbs canonical ensembles are deduced. The new method takes temperature increase or pressure decrease speed into[figure] account, reflecting that the homogeneous nucleation process is dynamic, and the nucleation rate is not a physical property of materials. Sample calculating results of the nucleation rate of some substances by the new method and by the commonly used kinetic method are given. The former gives out a slower increase of nucleation rate when temperature rises or pressure drops than the latter. Contrasting between these results and experimental results is also given. It turns out that the new hypothesis as well as the new formulae is reasonable and applicable. Finally, the new approach is verified with the LPG rapid discharge experiment. the LPG in a pressure vessel is discharged suddenly, causing the pressure drops rapidly. under certain conditions, the pressure will increase steeply. Sometimes, it may surpass its initial value. The conditions when the steep increase of pressure occurs are taken to calculate the homogeneous nucleation rate with both the kinetic approach and the fluctuation approach. The results reveal the reasonability of the new approach.[figure]

• 一般社団法人日本機械学会の論文

著者

• Lin Wensheng

  Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University

• Gu Anzhong

  Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University

• Lu Xuesheng

  Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University

• WANG Rongshun

  Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University

• Wang Rongshun

  Institute Of Refrigeration And Cryogenics Shanghai Jiaotong University

• Wang Rongshun

  Institute Of Functional Material Chemistry Faculty Of Chemistry Northeast Normal University

• Lu Xuesheng

  Institute Of Refrigeration And Cryogenics Shanghai Jiao Tong University

• Gu Anzhong

  Institute Of Refrigeration And Cryogenics Shanghai Jiao Tong University

• Lin Wensheng

  Institute Of Refrigeration And Cryogenics Shanghai Jiao Tong University

関連論文

• An Energy Fluctuation Approach to Calculate Homogeneous Nucleation Rate in Superheated Liquids and Its Verification by Performing an LPG Rapid Discharge Experiment
• TED-AJ03-605 A NEW APPROACH TO HOMOGENEOUS NUCLEATION RATE IN SUPERHEATED LIQUIDS AND ITS VERIFICATION IN LPG VAPOR EXPLOSION PROCESS
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• An Energy Fluctuation Approach to Calculate Homogeneous Nucleation Rate in Superheated Liquids and Its Verification by Performing and LPG Rapid Discharge Experiment
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