Temperature dependence of fluid mixtures diffusivity by ESPI endoscopy

Paoletti, Domenica; Spagnolo, Giuseppe Schirripa

doi:10.1016/0143-8166(95)00135-2

Cited by 11 publications

(8 citation statements)

References 11 publications

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“…Finally, the unknown parameters are estimated by solving Eqns. (12) and (13) for z y and z x , and are given as,…”

Section: Theorymentioning

confidence: 99%

“…An important class of techniques for diffusion measurements is comprised of the optical interferometric techniques, which offer several advantages such as full field measurement, good resolution, non-invasive operation and flexibility for both qualitative and quantitative assessment [6,7]. Some of the prominent optical techniques in this domain include holographic interferometry [8][9][10][11], electronic speckle pattern interferometry [12][13][14], speckle decorrelation [15], common path interferometry [16], phase-shifting interferometry [17] and projection moiré interferometry [18]. In particular, the method described by Spagnolo et al [18] can be considered a type of background-oriented schlieren [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Fast and robust method for flow analysis using GPU assisted diffractive optical element based background oriented schlieren (BOS)

Ramaiah

Ajithaprasad

Gannavarpu

et al. 2020

Optics and Lasers in Engineering

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The paper introduces a method for studying flow dynamics using diffractive optical element based background-oriented schlieren (BOS). Our method relies on fringe demodulation using root multiple signal classification technique which provides high robustness against noise. Further, a graphics processing unit (GPU) based implementation is proposed which offers significant improvement in computational efficiency, and thus enables high speed analysis of flows. The performance of the method is demonstrated via numerical simulations and the practical applicability is also shown by analyzing a diffusion phenomenon in liquids by BOS.

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“…Finally, the unknown parameters are estimated by solving Eqns. (12) and (13) for z y and z x , and are given as,…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast and robust method for flow analysis using GPU assisted diffractive optical element based background oriented schlieren (BOS)

Ramaiah

Ajithaprasad

Gannavarpu

et al. 2020

Optics and Lasers in Engineering

View full text Add to dashboard Cite

show abstract

“…Laser-based techniques are among the most sensitive methods employed for measuring diffusion coefficient and thermal conductivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In this paper we propose an improved version of digital projection moiré to study the refractive index variation in liquid mixtures and hence to measure the diffusion coefficient in mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Measurement of mass diffusion coefficients by digital moiré

2005

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In order to measure small diffusion coefficients of miscible fluids, in this paper we propose an improved version of digital projection moiré. The system uses a simple and flexible fringe generator realized by means of a video projector with a modification of projection optic. The fringe patterns are projected on the bottom of a ground glass plate. The phase object (diffusion cell) is placed in front of the ground glass (in other words, in front of the fringe pattern), which is imaged by a digital video camera. Grating patterns, during the evolution of diffusion phenomena, are captured by a CCD camera and stored in a computer at different times. With the aid of signal demodulating techniques, the images are processed to obtain the diffusion coefficients. The theoretical aspects of the method are presented and the relationship between the fringe shift and the diffusion coefficient is derived. Furthermore, we report some experiments conducted for demonstrating the usefulness of the system.

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“…Knowledge of diffusivity is necessary for the design of chemical equipment and for mass transfer studies. [11][12][13][14][15][16][17][18][19] Additionally, techniques involving interference require optical elements for the splitting and combining of laser beams making them bulky. 1,2 Diffusion in transparent liquid mixtures can be studied using various optical techniques, each having their own advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Imaging of mass transfer process using artificial fringe deflection

2014

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A noninterferometric technique used to measure the diffusion coefficients of transparent liquid solutions is reported. This technique uses a white light source and a diffusion cell, with an artificially developed fringe pattern of dark and white stripes at its entrance. As the diffusion process takes place in the cell, the light passing through this nonuniform refractive index medium will bend toward the higher refractive index region, which results in a fringe shift. This shift in the fringe pattern at different times is recorded in a personal computer (PC) using a CCD camera for the calculation of diffusion coefficients. The fringe shift is calculated after skeletonization and linear fit of the captured fringe system. The diffusion coefficient of different concentrations of ammonium dihydrogen phosphate was determined using the proposed technique and the measured values lay within 1% of the reported values. Detailed theoretical and experimental analyses with a comparison of other existing results are discussed.Chhaniwal, Narayanamurthy, and Anand: Imaging of mass transfer process using artificial fringe deflection Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/18/2015 Terms of Use: http://spiedl.org/terms

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Temperature dependence of fluid mixtures diffusivity by ESPI endoscopy

Cited by 11 publications

References 11 publications

Fast and robust method for flow analysis using GPU assisted diffractive optical element based background oriented schlieren (BOS)

Fast and robust method for flow analysis using GPU assisted diffractive optical element based background oriented schlieren (BOS)

Measurement of mass diffusion coefficients by digital moiré

Imaging of mass transfer process using artificial fringe deflection

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