Modern Optical Techniques in Fluid Mechanics

Lauterborn, Werner; Vogel, Alfred

doi:10.1146/annurev.fl.16.010184.001255

Cited by 128 publications

(35 citation statements)

References 51 publications

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“…Laser-generated bubbles of O(1) mm were observed by Lauterborn & Bolle (1975), Lauterborn (1982), Lauterborn & Vogel (1984), Lauterborn & Hentschel (1985), Vogel, Lauterborn & Timm (1989), Ohl, Philipp & Lauterborn (1995), , Shaw et al (1996Shaw et al ( , 1999, Tong et al (1999), Akhatov et al (2001), Brujan et al (2001Brujan et al ( , 2002, Robinson et al (2001), Lindau & Lauterborn (2003), Tomita & Kodama (2003), Gonzalez-Avila et al (2011) and Yang, Wang & Tan (2013). In these experiments, the buoyancy parameter δ, defined as √ ρgR m /(p amb − pv) in which R m , p amb , p v , ρ and g are the maximum bubble radius, ambient pressure, saturated vapour pressure, density of water and the acceleration of gravity respectively, was only O(0.01) due to the small bubble size, and buoyancy was therefore insignificant.…”

Section: Cavitation Bubblesmentioning

confidence: 99%

Experimental study on bubble dynamics subject to buoyancy

et al. 2015

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This paper is concerned with the dynamics of large bubbles subject to various strengths of buoyancy effects, which are associated with applications for underwater explosion. The bubble is produced by electric discharge in a low-pressure tank to enhance the buoyancy effects. Experiments are carried out for a bubble in an infinite field, below a free surface and above a rigid boundary. The effects of buoyancy are reflected by the dimensionless parameter δ = √ ρgR m /(p amb − p v ), where R m , p amb , p v , ρ and g are the maximum bubble radius, ambient pressure, saturated vapour pressure, density of water and the acceleration of gravity respectively. A systematic study of buoyancy effects is carried out for a wide range of δ from 0.034 to 0.95. A series of new phenomena and new features is observed. The bubbles recorded are transparent, and thus we are able to display and study the jet formation, development and impact on the opposite bubble surface as well as the subsequent collapsing and rebounding of the ring bubble. Qualitative analyses are carried out for the bubble migration, jet velocity and jet initiation time, etc. for different values of δ. When a bubble oscillates below a free surface or above a rigid boundary, the Bjerknes force due to the free surface (or rigid boundary) and the buoyancy are in opposite directions. Three situations are studied for each of the two configurations: (i) the Bjerknes force being dominant, (ii) the buoyancy force being dominant and (iii) the two forces being approximately balanced. For case (iii), we further consider two subcases, where both the balanced Bjerknes and buoyancy forces are weak or strong. When the Bjerknes and buoyancy forces are approximately balanced over the pulsation, some representative bubble behaviours are observed: the bubble near free surface is found to split into two parts jetting away from each other for small δ, or involutes from both top and bottom for large δ. A bubble above a rigid wall is found to be subject to contraction from the lateral part leading to bubble splitting. New criteria are established based on experimental results for neutral collapses where there is no dominant jetting along one direction, which correlate well with the criteria of Blake et al. (J. but agree better with the experimental and computational results.

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Section: Cavitation Bubblesmentioning

confidence: 99%

Experimental study on bubble dynamics subject to buoyancy

et al. 2015

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“…The PIV technique, which has been comprehensively reviewed [2,3,56,187,270,392] and especially by [386], is based on tracking the motion of tracer particles, e.g. polystyrene spheres or air bubble, in the flow field under study.…”

Section: Particle Image Velocimetrymentioning

confidence: 99%

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

Verma

Shlichta

2008

Progress in Crystal Growth and Characterization of Materials

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“…Flow visualization has been employed as an experimental tool in fluid mechanics for decades (Merzkirch, 1980;Lauterborn and Vogel, 1984). Based on light scattering of smoke, fluorescence of dye, visualization of fluid density variation, image of hydrogen bubbles or other types of flow markers, flow visualization has been widely applied to observe flow patterns and fluid fields.…”

Section: Introductionmentioning

confidence: 99%

“…It holds great promise as a 3D diagnostic tool -both qualitative and quantitative -for spatially and temporally evolving complex flow structures. Holography has been used for diagnosis of particles or aerosols in different types of flows and in combustion (Lee and Kim, 1986;Vikram, 1990). It has also been recently used in Holographic Particle Image Velocimetry (Holographic PIV or HPIV) to measure instantaneous full-field 3D velocity fields (Meng and Hussain, 1991;Barnhart et al, 1994;Meng and Hussain, 1995a, b;Pu et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Holographic flow visualization as a tool for studying three-dimensional coherent structures and instabilities

Meng

Estevadeordal

Gogineni

et al. 1998

J Vis

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Holography is capable of three-dimensional (3D) representation of spatial objects such as fluid interfaces and particle ensembles. Based on this, we adapt it into a 3D flow visualization tool called Holographic Flow Visualization (HFV). This technique provides a novel means of studying spatially and temporally evolving complex fluid flow structures marked by a disperse phase or interfaces of different fluids. This paper demonstrates that HFV is a straightforward technique, especially when the In-line Recording Off-axis Viewing (IROV) configuration is used. The technique can be applied either as a stand-alone experimental tool for studying scalar-based coherent structures, flow instabilities, interactions of different fluids driven by fluid dynamics, interfacial phenomena, or as a precursor to volumetric 3D velocity vector field measurement of complex transient flow dynamics. Experimental results in several complex fluid flows and flames demonstrate the effectiveness of HFV. Different methods are used to mark flow structures undergoing different instabilities: 1) a vortex ring grown out of a drop of polymer suspension falling in water, 2) cascade of a bag-shaped drop of milk in water, and 3) internal flow structures of a jet diffusion flame.

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Modern Optical Techniques in Fluid Mechanics

Cited by 128 publications

References 51 publications

Experimental study on bubble dynamics subject to buoyancy

Experimental study on bubble dynamics subject to buoyancy

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

Holographic flow visualization as a tool for studying three-dimensional coherent structures and instabilities

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