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Digital speckle-metrology local investigations of sedimentation and surface effects in liquids

机译：数字斑点计量学局部研究液体中的沉积和表面效应

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Abstract: Two digital speckle-metrology methods are being used for the study of two different phenomena in the field of fluid mechanics. With the out-of-plane digital speckle-pattern interferometry (DSPI), a first step is made in the study of the thermocapillary effect of air-liquid interface curvature changes (Marangoni effect). For the phase distribution evaluation a fast Fourier transform (FFT) based algorithm with additional carrier frequency - spatial heterodyning (SpH) - is used. In the experimental stage are registered the optical path changes in the liquid volume, due to the surface shape variations. Experimental results for two liquids (water and glycerin) at different temperatures are shown. The digital speckle-photography (DSPh) is used for the study of sedimentation velocity fields of thin suspensions. A 2D model (Hele-Shaw cell) of 3D flow is used. The developed software is based on the correlation method with unambiguous sign determination. This allows for a complete investigation of the sedimentation front instability. Experimental results are presented, showing velocity fields for different phases of the sedimentation - emerging and development of 'fingering' and uniform sedimentation. !13
机译：摘要：在流体力学领域，两种数字散斑计量学方法被用于研究两种不同的现象。利用平面外数字散斑图案干涉术（DSPI），研究气液界面曲率变化的热毛细管效应（Marangoni效应）迈出了第一步。为了进行相位分布评估，使用了基于快速傅立叶变换（FFT）的算法，该算法具有附加的载波频率-空间外差（SpH）-。在实验阶段，由于表面形状变化，记录了液体体积中的光程变化。显示了两种液体（水和甘油）在不同温度下的实验结果。数字散斑摄影技术（DSPh）用于研究薄悬浮液的沉降速度场。使用3D流的2D模型（Hele-Shaw单元）。所开发的软件基于具有明确符号确定的相关方法。这样就可以对沉降前沿的不稳定性进行完整的研究。给出了实验结果，显示了沉积不同阶段的速度场-“指状”和均匀沉积的出现和发展。 ！13

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