Three-dimensional Marangoni cell in self-induced evaporating cooling unveiled by digital holographic microscopy.
Three-dimensional Marangoni cell in self-induced evaporating cooling unveiled by digital holographic microscopy.
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数字全息显微镜揭示了自诱导蒸发冷却的三维马兰戈尼电池。
DOI：
10.1103/physreve.89.013007
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
C. Buffone
中科院分区：
文献类型：
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作者：
C. Minetti;C. Buffone
用数字全息显微镜跟踪示踪剂颗粒在蒸发弯月面中的轨迹，该蒸发弯月面是在一根1mm2的充满乙醇的硼硅酸盐管口形成的。Marangoni流动单体是由沿半月面界面的自感应差动蒸发冷却产生的，该冷却产生了驱动对流的表面张力梯度。弯曲的半月面界面上的表面张力和重力之间的竞争破坏了对称性，这是由于表面张力本身造成的。这扭曲了环形Marangoni涡旋的形状。通过分析示踪剂粒子的运动轨迹，报道了蒸发弯月面的热毛细不稳定性。结果发现，示踪粒子的轨迹会形成不同的三维循环，每四个循环就会返回第一个循环。通过对几个回路的分析，发现周期振荡运动的特征频率在0.125赫兹左右。
A digital holographic microscope has been used to trace the trajectory of a tracer particle inside the liquid phase of an evaporating meniscus formed at the mouth of a 1-mm2 borosilicate tube filled with ethanol. The Marangoni flow cells are generated by the self-induced differential evaporating cooling along the meniscus interface that creates gradients of surface tension which drive the convection. The competition between surface tension and gravity forces along the curved meniscus interface disrupts the symmetry due to surface tension alone. This distorts the shape of the toroidal Marangoni vortex. Thermocapillary instabilities of the evaporating meniscus are reported by analyzing the trajectories of the tracer particle. It is found that the trajectory of the tracer particle makes different three-dimensional loops and every four loops it returns to the first loop. By analyzing several loops it was found that the characteristic frequency of the periodic oscillatory motion is around 0.125 Hz.