氧化层对液态金属起始沸腾过热度的影响模型

Modeling of Oxide Layer Effect on Liquid Metal Incipient Boiling Superheat

液态金属具有良好的浸润性,因此常具有很高的起始沸腾过热度。但在浸润性差的氧化层的影响下,起始沸腾过热度可大幅降低。为对氧化层作用进行分析,建立了氧化层的影响模型,并利用实验数据进行了验证。结果表明,氧化层作用下的核化过程可分为直接核化和界面移动后的核化两类,氧化层作用下的核化半径介于氧化层位置及界面最深处位置之间,其最佳估算值为两者的几何平均值。

Liquid metals have good wetting properties,and thus the incipient boiling superheat is usually very high.However,the existing of oxide layer which has bad wetting properties can significantly reduce the incipient boiling superheat.In order to study the oxide layer effects,an oxide layer effect model was established and verified by test data.The results show that the nucleation process under the effects of oxide layer can be divided into two types,i.e.the direct nucleation and the nucleation after interface movement.The nucleation radius under the oxide layer effect should be between the values of the oxide layer location and the deepest interface location,and the best-estimated value is their geometric mean.