Abstract The research subjects are immiscible two-component droplets containing combustible and non-combustible liquids with a clear interface, as well as emulsion droplets. The key limitations are identified for the current models unable to adequately describe the critical (threshold) conditions and characteristics of micro-explosion. Experiments are conducted to obtain the heating times until breakup (delay times) and critical (threshold) temperatures triggering the droplet breakup. Two methods are used: a droplet is either suspended on a holder and placed into the heating chamber or it free-falls in a tubular muffle furnace. The developed models reliably describe the processes under study when two threshold conditions of droplet breakup are used: non-combustible component reaching its boiling temperature at the inter-component interface and a bubble or a group of bubbles in a droplet growing in size beyond critical values. In the experiments, the heating temperature ranges from 500 to 1400 K, the initial droplet size is between 1 and 3 mm, and the relative volume concentrations of the components are varied in the range of 10–90 vol%. An acceptable agreement has been established for the key heating and fragmentation characteristics at various heating temperatures and with component compositions of heterogeneous droplets. The maximum deviations of the theoretical droplet breakup times from the experimental ones do not exceed 40%. For critical (minimum and maximum) heating temperatures of the external medium sufficient for breakup, the deviations of theoretical and experimental data do not exceed 50 K. The study defines the conditions, in which the newly developed models can reliably predict the characteristics of micro-explosive droplet breakup. Hypotheses have been formulated explaining the differences between theoretical and experimental characteristics of micro-explosive droplet breakup. The research findings enable to outline the promising ways to improve micro-explosive breakup models for their further use in the secondary atomization of heterogeneous liquids, for instance, to develop the technologies of fuel ignition, thermal and flame water treatments, etc.

中文翻译：

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模拟混溶和不混溶液滴的微爆炸

摘要 研究对象为界面清晰的含可燃和不可燃液体的不混溶双组分液滴以及乳液液滴。当前模型无法充分描述微爆炸的临界（阈值）条件和特征，因此确定了关键限制。进行实验以获得直到破裂（延迟时间）和触发液滴破裂的临界（阈值）温度的加热时间。使用两种方法：液滴要么悬浮在支架上并放入加热室，要么在管状马弗炉中自由下落。当使用两个液滴破碎阈值条件时，开发的模型可靠地描述了所研究的过程：不可燃组分在组分间界面处达到其沸腾温度，并且液滴中的气泡或一组气泡的尺寸超过临界值。在实验中，加热温度范围为 500 到 1400 K，初始液滴尺寸在 1 到 3 毫米之间，组分的相对体积浓度在 10-90 vol% 的范围内变化。对于不同加热温度下的关键加热和破碎特性以及异质液滴的组分组成，已经建立了可接受的协议。理论液滴破裂时间与实验结果的最大偏差不超过 40%。对于足以分解的外部介质的临界（最小和最大）加热温度，理论和实验数据的偏差不超过 50 K。该研究定义了新开发的模型可以可靠地预测微爆炸液滴破裂特征的条件。已经制定了假设来解释微爆炸液滴破裂的理论和实验特征之间的差异。研究结果概述了改进微爆炸破碎模型的有前景的方法，以进一步用于非均质液体的二次雾化，例如，开发燃料点火、热和火焰水处理等技术。已经制定了假设来解释微爆炸液滴破裂的理论和实验特征之间的差异。研究结果概述了改进微爆炸破碎模型的有前景的方法，以进一步用于非均质液体的二次雾化，例如，开发燃料点火、热和火焰水处理等技术。已经制定了假设来解释微爆炸液滴破裂的理论和实验特征之间的差异。研究结果概述了改进微爆炸破碎模型的有前景的方法，以进一步用于非均质液体的二次雾化，例如，开发燃料点火、热和火焰水处理等技术。