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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of the behaviors of highly deformed bubbles produced by coaxial coalescence
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Experimental investigation of the behaviors of highly deformed bubbles produced by coaxial coalescence

机译：同轴聚结产生高变形气泡的实验研究

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In this paper, the highly deformed bubbles produced in the regime of bubbling with coalescence are studied systematically, starting from their formation up to their collapse dynamics. We investigate the bubbling dynamics by performing experiments with various liquids (ultrapure water and silicone fluids), gas flow rates (5-300 ml/min) and nozzle radii (0.18-0.55 mm). The evolution of the coalescing process is analyzed in detail, differentiating among four phases: liquid film drainage, neck formation, wave propagation along the bubble surface and bubble detachment. A phase diagram for coaxial coalescence and no coalescence is established in terms of the Weber (to describe the effects of inertia) and the Morton number numbers (to describe the effects of liquid property). Scaling arguments show that the coalescing dynamics is driven by inertia-capillary and viscosity can be neglected. We then present the interesting experimental investigation of large and elongated bubbles just after pinch-off. We deduce the dependence of the geometrical properties of these highly deformed bubbles on the bubbling conditions and a simple model is derived. Finally, we explore the dynamics of the inertial liquid jets arising from the collapse of such highly deformed bubbles. Regardless of the details of the collapse process, we propose a simple scaling law for the jet velocity and unravel the intricate roles of bubble geometry and liquid parameters.
机译：在本文中，系统地研究了用聚结的鼓泡制度中产生的高变形气泡，从其形成直至其塌陷动态。我们通过用各种液体（超纯水和硅润滑液），气流速率（5-300ml / min）和喷嘴半径（0.18-0.55mm）进行试验来研究鼓泡动力学。详细分析了聚结过程的演变，区分了四个阶段：液体膜排水，颈部形成，沿气泡表面的波传播和气泡脱离。同轴聚结的相图，在韦伯（描述惯性的影响）和Morton数数（描述液体性质的影响）方面建立了同轴聚结的相图。缩放争论表明，聚结动力由惯性毛细管驱动，粘度可以忽略粘度。然后，我们在捏掉后展示了对大型和细长气泡的有趣实验研究。我们推导出这些高变形气泡对鼓泡条件的几何特性的依赖性，并且得出了简单的模型。最后，我们探讨了从这种高变形气泡的塌陷产生的惯性液体喷射的动态。无论崩溃过程的细节如何，我们提出了一个简单的缩放法，用于喷射速度并解开泡沫几何和液体参数的复杂作用。

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