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- Title
水力机械空化初生的分子动力学模拟.
- Authors
高旭娜; 袁建刚; 蒋斐; 马兴荣
- Abstract
n order to study the transient characteristics of hydro-mechanical cavitation inception,the molecular dynamics simulation method was applied to study the calculation domain of water molecules with cavitation nucleus,and the influence of the initial size of cavitation nucleus and system metastable on cavitation inception were obtained.System pressure,molecular potential energy,molecular radial distribution function and the related thermodynamic parameters of cavitation nucleus evolution were analyzed.The cavitation is formed from cavitation nuclei in liquid water. The cavitation nuclei and the liquid water in a small area around it are in a negative pressure state when cavitation occurs.System with a certain volume of cavitation nuclei has a critical metastable state.The cavitation nuclei of the system which does not enter the critical metastable state cannot exist stably. After entering the critical metastable state,the cavitation nuclei volume increases and cavitation occurs. The larger the cavitation nuclei,the easier it is for the system to enter the critical metastable state,thereby inducing cavitation.At the time of cavitation inception,the system pressure increases rapidly,the molecular potential energy decreases,and the molecular arrangement changes.
- Publication
Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng, 2019, Vol 34, Issue 8, p43
- ISSN
1001-2060
- Publication type
Article
- DOI
10.16146/j.cnki.rndlgc.2019.08.007