Tkachenko Pavel, Shlegel Nikita, Strizhak Pavel
Scientific and Educational Department of I.N. Butakova, Power Engineering School, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia.
Entropy (Basel). 2021 Nov 8;23(11):1476. doi: 10.3390/e23111476.
The paper presents the experimental research findings for the integral characteristics of processes developing when two-phase liquid droplets collide in a heated gas medium. The experiments were conducted in a closed heat exchange chamber space filled with air. The gas medium was heated to 400-500 °C by an induction system. In the experiments, the size of initial droplets, their velocities and impact angles were varied in the ranges typical of industrial applications. The main varied parameter was the percentage of vapor (volume of bubbles) in the droplet (up to 90% of the liquid volume). The droplet collision regimes (coalescence, bounce, breakup, disruption), size and number of secondary fragments, as well as the relative volume fraction of vapor bubbles in them were recorded. Differences in the collision regimes and in the distribution of secondary fragments by size were identified. The areas of liquid surface before and after the initial droplet breakup were determined. Conditions were outlined in which vapor bubbles had a significant and, on the contrary, fairly weak effect on the interaction regimes of two-phase droplets.
本文介绍了在加热气体介质中两相液滴碰撞时过程整体特性的实验研究结果。实验在充满空气的封闭热交换腔空间中进行。气体介质通过感应系统加热到400 - 500°C。在实验中，初始液滴的尺寸、速度和碰撞角度在工业应用的典型范围内变化。主要变化参数是液滴中蒸汽（气泡体积）的百分比（高达液体体积的90%）。记录了液滴碰撞模式（聚结、反弹、破碎、分裂）、二次碎片的尺寸和数量，以及其中蒸汽气泡的相对体积分数。确定了碰撞模式和二次碎片尺寸分布的差异。测定了初始液滴破碎前后的液体表面积。概述了蒸汽气泡对两相液滴相互作用模式有显著影响以及相反影响相当微弱的条件。
