Study on dynamic deformation synchronized measurement technology of double-layer liquid surfaces

Tang, Huiying; Dong, Honggang; Liu, Zhanwei

doi:10.1016/j.optlaseng.2017.06.026

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…It provides a qualitative information about the shape of the liquid film and it clearly documents the existence of the azimuthal variations of the Boger film-droplet interface, which occur beneath the droplet-air interface, and their existence was identified using a combination of the light transmission and transmission-speckle methods. A new technique using two different light wavelengths with different refractions at each interface and leading to different speckle virtual deformation fields amenable to individual analyses might resolve limitations of the current methodology when two interfaces are present (Tang, Dong & Liu 2017).…”

Section: Interface Deformation Analysis Using the Transmission-speckl...mentioning

confidence: 99%

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Huang

et al. 2023

J. Fluid Mech.

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Marangoni spreading on thin films is widely observed in nature and applied in industry. It has serious implications for airway drug delivery, especially in surfactant displacement therapy. This paper reports the results of experimental investigations of a surfactant-laden droplet spreading on films made of more viscous Newtonian fluids as well as on films made of viscoelastic fluids. The experiments used particle seeding, the transmission-speckle method and particle tracking velocimetry (PTV) to determine the deformation of the film–droplet interface and to measure velocity fields. Radially aligned patterns were observed on Newtonian films. Similar patterns, but with much smaller wavenumber, were observed on viscoelastic films in combination with rapid azimuthal variations of the film thickness. The Saffman–Taylor instability at the film–droplet interface explains the formation of patterns on a more viscous Newtonian film, and their onset requires exceeding the critical capillary number. The pattern formation on viscoelastic films is correlated with an instability at the film–droplet–air contact line when the liquid is expelled radially by the spreading droplet. PTV revealed azimuthal variations of the velocity field in the vicinity of the contact line. The observed contact line instability is different from previously reported fingering instabilities of Newtonian thin films. A simple scaling law accounting for the Marangoni-stress-induced elastic shear deformation is proposed to describe the flow field in the patterns formed in the viscoelastic films.

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Section: Interface Deformation Analysis Using the Transmission-speckl...mentioning

confidence: 99%

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Huang

et al. 2023

J. Fluid Mech.

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“…Figure 1(a) shows the propagation of light on liquid surface. The carrier pattern such as lattices [22], fringes [23], speckles [21,24,25], grids [20], or dots [18], is placed at the bottom of the liquid for the measurement. First, the light of the carrier pattern is emitted from the bottom of the liquid and refracts as it passes through the surface of the liquid, and then travels straight up until captured by the optical camera.…”

Section: Refraction Of Lights On a Transparent Liquid Surfacementioning

confidence: 99%

“…After interpolation, a sampling moiré pattern with a pitch p m is obtained, as shown in figure 2(b). If the second point is selected as the starting point for sampling at the constant pitch M, a 2π/M phase-shifted image of moiré pattern can be obtained, as shown in figure 2(c) [25]. And the moiré patterns shown in figures 2(d)-(f) are selected as the third, the fourth and the fifth points of the starting point of sampling, respectively, using the same operation [25].…”

Section: The Phase Measurement Of the Fringe Patternmentioning

confidence: 99%

“…If the second point is selected as the starting point for sampling at the constant pitch M, a 2π/M phase-shifted image of moiré pattern can be obtained, as shown in figure 2(c) [25]. And the moiré patterns shown in figures 2(d)-(f) are selected as the third, the fourth and the fifth points of the starting point of sampling, respectively, using the same operation [25]. From a single image the multiple phase-shifted images of the moiré fringe pattern can be obtained.…”

Section: The Phase Measurement Of the Fringe Patternmentioning

confidence: 99%

“…However, they have a limited measurements range and only suitable for small deformations. Liu et al [20][21][22][23][24][25] proposed a fringe transmission technique for measuring the deformation of large liquid surface by analyzing the in-plane deformation of transmission fringe patterns. This set of techniques have advantages of non-contact and full-field measurements, and the experimental set-up is very simple and easy to operate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

3D shape measurement of complex transparent liquid surfaces using monoscopic deformed fringe transmissometry

Zhong

Huang

Dong

et al. 2019

Meas. Sci. Technol.

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The measurement of transparent liquid surface topography is of great importance in many fields such as hydrodynamics of water-walking insects, liquid sloshing and flotation, etc. However, techniques for measuring these specular and rheological surfaces, especially for surfaces with floating objects, have been lacking. Here we report a monoscopic deformed fringe transmissometry for measuring complex transparent liquid surfaces with theoretical sensitivity up to 0.40 µm. The basic principle is to reconstruct the 3D liquid surfaces by the mathematical relations between the in-plane fringe phase-shift and the out-of-plane shape of the liquid surface. It only needs to project a single fringe pattern from the bottom of the liquid and capture a single deformed image from above. A sub-pixel sampling moiré method is proposed to process the captured fringe pattern to obtain the precise phase component and the displacement field, which is then used to reconstruct the 3D shape of the liquid surface. The discontinuous fringes in the pattern also settled by covering an extracted mask to the displacement filed. The verification test of floating 3D printed characters indicates that this new technique is robust in measuring the 3D shape of complex liquid surface. The developed technique provides a versatile tool to explore interfacial phenomena such as wetting, floating, surface wave, etc.

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Application of digital image correlation (DIC) to sloshing liquids

Chien

Huang

et al. 2019

Optics and Lasers in Engineering

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Study on dynamic deformation synchronized measurement technology of double-layer liquid surfaces

Cited by 5 publications

References 17 publications

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

Experiments on Marangoni spreading – evidence of a new type of interfacial instability

3D shape measurement of complex transparent liquid surfaces using monoscopic deformed fringe transmissometry

Application of digital image correlation (DIC) to sloshing liquids

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