High accuracy optical particle sizing in phase-Doppler anemometry

Qiu, Huihe; Jia, Wangcun; Hsu, Chin; Sommerfeld, Martin

doi:10.1088/0957-0233/11/2/306

Cited by 10 publications

(9 citation statements)

References 7 publications

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“…This method, with the extension of the previous optical techniques [10,11], utilized the total reflected interference fringe pattern to estimate the liquid film thickness between the gas-liquid-glass interfaces. A well matched liquid surrounding the micro glass pipe was used to reduce the complication of the calculations.…”

Section: Introductionmentioning

confidence: 99%

Measurements of interfacial film thickness for immiscible liquid–liquid slug/droplet flows

Qiu

Wang²,

Hong³

2005

Meas. Sci. Technol.

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A novel method for measuring the interfacial liquid film thickness between immiscible liquids of a slug/droplet in a micropipe is proposed. This method is capable of measuring an oil slug/droplet in water with the relative refractive index (m) between the immiscible liquids very close to one in a capillary tube. Unlike the measurement configuration for an air slug in water, an optical oriental for optimizing the refracted fringes pattern by the liquid-liquid interface is introduced. Measurements of film thicknesses of a kerosene oil droplet/slug in a water wetted capillary tube (m > 1) and a water droplet/slug in a kerosene oil wetted capillary tube (m < 1) were demonstrated. This diagnostic method is easy to implement and it will have great potential for immiscible liquid flow research in microfluidic channels.

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Section: Introductionmentioning

confidence: 99%

Measurements of interfacial film thickness for immiscible liquid–liquid slug/droplet flows

Qiu

Wang²,

Hong³

2005

Meas. Sci. Technol.

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“…Recently, Qiu et al [22] have proposed modifications to PDA to improve the measurement accuracy in dense sprays. In addition, Koh and Yoon [23] used an optical line patternator to measure particle size distribution in dense sprays.…”

Section: Resultsmentioning

confidence: 99%

“…The pdf can be calculated from the CFD simulations by knowing the values of α i . The pdf for the i th particle size class is calculated as K is calculated from the normalization constraint that requires (22) It must be mentioned that the probability data from the numerical simulations are known only at the particle size values associated with the discrete phases. However, the probability density function is a continuous function of particle size.…”

Section: Resultsmentioning

confidence: 99%

Eulerian Multiphase Population Balance Model of Atomizing, Swirling Flows

Rayapati

Panchagnula

Peddieson

et al. 2011

International Journal of Spray and Combustion Dynamics

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An Eulerian/Eulerian multiphase flow model coupled with a population balance model is used as the basis for numerical simulation of atomization in swirling flows. The objective of this exercise is to develop a methodology capable of predicting the local point-wise drop size distribution in a spray, such as would be measured by the Phase Doppler Particle Analyzer (PDA). Model predictions are compared to experimental measurements of particle size distributions in an airblast atomizer spray to demonstrate good qualitative and quantitative agreement. It is observed that the dependence of velocity on drop size inherent in a multiphase description of the drop cloud appears necessary to capture some features of the experimental data. Using this model, we demonstrate the relative contributions of secondary atomization and transport to the variation observed in the downstream spray drop size distribution.

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“…The validation experiments based on this method demonstrated successfully in measuring particles with refractive index greater than one [11]. The Gaussian beam defect and slit effect can be eliminated according to the validation experiments [11]. However, the previous simulations and experiments were only conducted for the case of refractive index greater than one.…”

Section: Introductionmentioning

confidence: 98%

“…in bubbly flows) [12]. In this study a method based on the recently developed dual mechanisms' scattering model [10,11] was further developed. In this method two scattering phases measured by photodetectors are used to calculate the particle size.…”

Section: Introductionmentioning

confidence: 99%

The impact of high order refraction on optical microbubble sizing in multiphase flows

Qiu

Hsu

2004

Experiments in Fluids

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The measurements of bubble size and velocity in multiphase flows are important in many researches and industrial applications. It has been found that the high order refraction has great impact on PDA sizing method when the relative refractive index of media is less than one. Although the spatial frequencies of first order refraction and surface reflection become identical at the optimized scattering angle by using previously proposed method, the second order, as well as high order, refractions can not be neglected, because of different spatial frequency and motion direction. The problem has been investigated and a model of phase-size correlation, which also takes the high order refractions into consideration, is introduced to improve the accuracy of bubble sizing. In this study a method based on the recently developed dual mechanisms' scattering model was further developed. Two scattering phases measured by photodetectors are used to calculate the particle size. By utilizing the conversion factor of second order refraction, as well as some high order refractions, the particle diameter can be solved numerically. Hence, the model relaxes the assumption of single scattering mechanism in conventional phase-Doppler anemometry. To demonstrate the capability of the newly developed method, the model was simulated numerically by using Generalized Lorenz Mie Theory (GLMT). The optical parameters such as the measurement volume size, the focus lengths of the sending and receiving lenses, the size and shape of the receiving aperture, the particle size and its trajectory, and the phase conversion factors are used to analyze the performance of the newly developed method. The results of simulation are compared with those based on the conventional method. An optimization method for accurately sizing air-bubble in water has been suggested.

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High accuracy optical particle sizing in phase-Doppler anemometry

Cited by 10 publications

References 7 publications

Measurements of interfacial film thickness for immiscible liquid–liquid slug/droplet flows

Measurements of interfacial film thickness for immiscible liquid–liquid slug/droplet flows

Eulerian Multiphase Population Balance Model of Atomizing, Swirling Flows

The impact of high order refraction on optical microbubble sizing in multiphase flows

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