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纳米流体核态沸腾理论预测模型的缺乏阻碍了其作为高效换热介质在工业系统中的应用。为实现对纳米流体核态沸腾的准确预测和计算,该文在现有实验基础上对纳米流体核态沸腾的特有现象进行了机理分析,建立了一系列的封闭方程来修正和完善经典的壁面热通量拆分模型,将模拟结果与纳米流体及纯工质核态沸腾的实验数据进行了对比,对模型中的一些物理参数进行了理论探讨。研究表明:采用壁面热通量拆分模型模拟纳米流体核态沸腾的关键在于准确模拟纳米包覆层对汽泡成核、生长及脱离规律的影响,特别是要准确把握壁面润湿性及壁面形态变化对核态沸腾特征的影响。
The lack of prediction models for the theory of nucleate boiling in nanofluids hinders its application as an efficient heat transfer medium in industrial systems. In order to accurately predict and calculate the nucleate boiling of nanofluids, this paper presents a mechanistic analysis of the unique phenomenon of nucleate boiling in nanofluids on the basis of the existing experiments, and establishes a series of closed equations to correct and perfect the classical wall The heat flux splitting model is compared with experimental data of nanofluids and pure working fluid nucleate boiling, and some physical parameters in the model are discussed theoretically. The results show that the key to simulate the nucleate boiling of nanofluids is to accurately simulate the influence of nanocapsules on the nucleation, growth and detachment of bubbles, especially the wall wettability and wall surface Effect of morphological changes on nucleate boiling characteristics.