Two-phase flow structure assessment based on dynamic image analysis

Masiukiewicz, Maciej; Anweiler, Stanisław

doi:10.1016/j.flowmeasinst.2018.12.005

Cited by 10 publications

(3 citation statements)

References 17 publications

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“…This is one of the drift flux methods, which allows the determination of the volume fraction (α = W GO /W G ) as the ratio of the apparent gas phase velocity to the actual gas phase velocity. A detailed discussion of this method has been included in the paper [38]. In the reported study, a derivative of the Zuber-Findlay method was applied for calculations of the gas void fraction, that is particularly recommended to use for airlift pumps by Reinemann et al [39].…”

Section: Methodsmentioning

confidence: 99%

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Ligus

Zając²,

Masiukiewicz

et al. 2019

Energies

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This paper presents experimental studies on the optimization of two-phase fluid flow in an airlift pump. Airlift pumps, also known as mammoth pumps, are devices applied for vertical transport of liquids with the use of gas. Their operating principle involves the existence of a density gradient. This paper reports the results of experimental studies into the hydrodynamic effects of the airlift pump. The studies involved optical imaging of two-phase gas-liquid flow in a riser pipe. The visualization was performed with high-speed visualization techniques. The studies used a transparent model of airlift pump with a rectangular cross-section of the riser. The assessment of the airlift pump operation is based on the image grey-level analysis to provide the identification of two-phase flow regimes. The scope of the study also involved the determination of void fraction and pressure drops. The tests were carried out in a channel with dimensions 35 × 20 × 2045 mm with the gas flux range 0.2–15.0 m3/h. For the assessment of the two-phase flow pattern Probability Density Function (PDF) was applied. On the basis of the obtained results, a new method for selecting the optimum operating regime of airlift pump was derived. This method provides the finding of stability and efficiency of liquid transport. It can also be applied to determine the correlation between the total lifting efficiency and the required gas flux for proper operation of the airlift pump.

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Section: Methodsmentioning

confidence: 99%

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Ligus

Zając²,

Masiukiewicz

et al. 2019

Energies

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“…Visualization studies of adiabatic, two-phase, gas-liquid flow in vertical channels have been carried out by many authors [31,32]. Quantitative stereology technique was used in this work.…”

Section: Image Analysismentioning

confidence: 99%

Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

Sikora

2021

Materials

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This article presents the results of flow visualization studies of Novec refrigerants during condensation in minichannels. Experimental investigation of two-phase flow regimes was conducted in minichannels with internal diameter dh = 2.5, 2.0, 1.2, and 0.5 mm. Images of the two-phase flow structures were analyzed by using the MATLAB algorithm. To calculate void fraction, a two-dimensional areal quantitative stereology technique was used. Observation of flow structures formed during the process of condensation was the major aim of the investigations. The condensation studies were conducted over a wide range of mass flux densities (G = 80–5500 kg/m2s) and saturation temperatures (ts = 30–70 °C). Visualization results and image analysis methods are described in this paper. Based on the experimental results, a flow structure map was constructed and presented.

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“…Based on these images, using statistical methods, it is possible to determine the speed of movement of the marker particles and ultimately the speed of the medium in which the particles move. Using multiple-image recording methods, which is the dominant direction of the PIV method application, the mean shift of marker particles is determined using the CCF (Cross-Correlation Function) method [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The use of PIV methods in the study of two-phase flows in small diameter channels

Sikora

Ligus

2022

Journal of Mechanical and Energy Engineering

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The PIV (Particle Image Velocimetry) method is one of the optical, non-invasive measurement methods for measuring fluid velocity and can be used in the study of two-phase gas-liquid flows to determine velocity fields. The velocity distribution of the liquid and gas phases influences the formation of two-phase flow structures and, consequently, the mechanisms of energy and moment exchange in the two-phase flow. The article concerns the application of the PIV method to the assessment of hydrodynamic phenomena occurring during two-phase flow realized in pipe minichannels with an internal diameter d > 2 mm. Fluorescent marker particles with a density close to that of water were used in the research. The preliminary tests were carried out on the adiabatic water-air mixture. The research aimed to check the applicability of PIV methods also in non-adiabatic flows. As a result of preliminary studies, velocity maps of the liquid phase, histograms and velocity profiles in the vertical section of the tested minichannel were obtained.

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Two-phase flow structure assessment based on dynamic image analysis

Cited by 10 publications

References 17 publications

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

A New Method of Selecting the Airlift Pump Optimum Efficiency at Low Submergence Ratios with the Use of Image Analysis

Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

The use of PIV methods in the study of two-phase flows in small diameter channels

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