The paper presents experimental research findings for the convection velocities in the gas and liquid phases during micro-explosive fragmentation of droplets heated on a solid surface. The experiments were conducted with two types of bi-component droplets: emulsified and unmixed ones. A scheme with an induction heater in the temperature range of 75–550 °C was used. The convection velocities were recorded in droplets during heating, rapid evaporation, partial fragmentation in the puffing regime and full fragmentation in the micro-explosion regime. Typical shapes and dimensions of the origins of vortex formation were distinguished. The velocities of vapor outflow from the surface of the droplet and secondary fragments as a result of droplet breakup were established. Their variation ranges were determined. The effect of the surface temperature, droplet dimensions, component composition of liquid and type of droplets on these velocities was identified. The research findings were compared with the previous data obtained in experiments with a droplet fixed on a holder in a hot air flow. We showed threshold convection velocities in droplets sufficient for their breakup during puffing and micro-explosion regimes. General approximations were derived for the convection velocities in the droplets under study versus the substrate temperature.

本文介绍了在固体表面上加热的液滴微爆炸破碎过程中气相和液相对流速度的实验研究结果。实验使用两种类型的双组分液滴进行：乳化液滴和未混合液滴。使用温度范围为 75–550 °C 的感应加热器方案。在加热、快速蒸发、膨化状态下的部分破碎和微爆炸状态下的完全破碎过程中，对流速度记录在液滴中。区分了涡旋形成起源的典型形状和尺寸。确定了由于液滴破裂而从液滴和二次碎片表面流出的蒸汽的速度。确定了它们的变化范围。表面温度的影响，确定了液滴尺寸、液体成分组成和液滴类型。将研究结果与之前在热气流中固定在支架上的液滴进行实验中获得的数据进行了比较。我们展示了液滴中的阈值对流速度，足以使其在膨化和微爆炸状态下破裂。所研究的液滴中的对流速度与基底温度的关系得到了一般近似值。我们展示了液滴中的阈值对流速度，足以使其在膨化和微爆炸状态下破裂。所研究的液滴中的对流速度与基底温度的关系得到了一般近似值。我们展示了液滴中的阈值对流速度，足以使其在膨化和微爆炸状态下破裂。所研究的液滴中的对流速度与基底温度的关系得到了一般近似值。