Abstract Robust predictive models of dynamic bubbly systems of nanoparticle-liquid mixtures are vital to the design and assessment of relevant industrial systems. Previous attempts to model bubbly flows of dilute nanofluids using the classic two-phase flow models were unsuccessful although the apparent hydrodynamic properties of the dilute nanoparticle-liquid mixtures were only negligibly different to those of their pure base liquids. Emerging studies demonstrated that when bubbles exist in the mixture, nanoparticles tend to spontaneously aggregate at the bubble interface, forming a layer of “colloidal armour” and making the bubble interface partially rigid and less mobile. The colloidal armour also significantly modifies the characteristics of the bubble-liquid and bubble-bubble interactions. Therefore, it was proposed that the key job when developing a predictive model based on classic two-phase flow models is to re-formulate the bubble-liquid and bubble-bubble interactions. However, the adsorption of nanoparticles in dynamic bubbly systems has rarely been studied. The lack of mechanistic understanding has severely hindered the model development. Therefore, this study reviews the common findings yielded from experimental and numerical investigations reported in literature, with the aim to clarify the critical points to address when modelling bubbly flows containing nanoparticles using the classic two-fluid and MUSIG models.

中文翻译：

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自发纳米颗粒吸附对多分散气泡系统中气泡-液体和气泡-气泡相互作用的影响——综述

摘要 纳米颗粒-液体混合物动态起泡系统的稳健预测模型对于相关工业系统的设计和评估至关重要。以前尝试使用经典的两相流模型模拟稀纳米流体的气泡流并没有成功，尽管稀纳米颗粒-液体混合物的表观流体动力学特性与其纯基液的流体动力学特性仅有微不足道的差异。新兴研究表明，当混合物中存在气泡时，纳米颗粒倾向于在气泡界面自发聚集，形成一层“胶体盔甲”，使气泡界面部分刚性且不易流动。胶体装甲还显着改变了气泡-液体和气泡-气泡相互作用的特性。所以，有人提出，在基于经典两相流模型开发预测模型时，关键工作是重新制定气泡-液体和气泡-气泡相互作用。然而，很少研究纳米颗粒在动态气泡系统中的吸附。缺乏机理理解严重阻碍了模型的发展。因此，本研究回顾了文献中报道的实验和数值研究的共同发现，旨在阐明在使用经典的双流体模型和 MUSIG 模型对含有纳米颗粒的气泡流进行建模时要解决的关键点。缺乏机理理解严重阻碍了模型的发展。因此，本研究回顾了文献中报道的实验和数值研究的共同发现，旨在阐明在使用经典的双流体模型和 MUSIG 模型对含有纳米颗粒的气泡流进行建模时要解决的关键点。缺乏机理理解严重阻碍了模型的发展。因此，本研究回顾了文献中报道的实验和数值研究的共同发现，旨在阐明在使用经典的双流体模型和 MUSIG 模型对含有纳米颗粒的气泡流进行建模时要解决的关键点。