Recognition of two-phase flow patterns with the use of dynamic image analysis

Ulbrich, R.; Krótkiewicz, Marek; Szmolke, N.; Anweiler, Stanisław; Masiukiewicz, Maciej; Zając, D.

doi:10.1243/095440802321194503

Cited by 12 publications

(11 citation statements)

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“…It was demonstrated that different two-phase flow regimes can occur under identical flow conditions, yet, under the condition that other types of gas distribution systems are used. Similar results are reported in other papers [26,41,42]. This fact confirms the considerable effect of the gas phase distributor on two-phase flow regimes.…”

Section: Resultssupporting

confidence: 92%

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: Resultssupporting

confidence: 92%

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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“…After then, to identify flow regime some image processing algorithm such as watershed segmentation, top-hat filtering and H-minima transform etc. can be applied [146,7]. The processing allows determining the bubble velocity, shape, length and frequency with the standard error of 7%.…”

Section: Flow Regime Identificationmentioning

confidence: 99%

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Wajman

2019

ITC

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Nowadays, the application of advanced technologies in modern production systems is the main trend of development and technological progress in many industrial sectors. It is due to the still growing trends of energy-saving and production quality enhancement. Wherever in the production process the phase mixture is transported and it is not optimal or not economic, there is a need to develop a system which would be able to prevent any construction disaster, unexpected production line stopping or situation where for reasons of bad flow parameters, the final product is defective. This paper studies various sensors, measurement techniques and computer methods for signal processing and analysis to diagnose and control two-phase flows. Due to the possibility that the invasive measurement disturbs the process and changes it parameters and behavior especially in the location just after the measurement point and simultaneously does not provide any information about these changes it is unreliable for the diagnosis or control. Therefore, the non-invasive techniques commonly used for measurement of flows parameters are described. Depending on the industrial demands many of applications examples for non-invasive two-phase flows measurement and monitoring are given. This description for identifying the flow parameters is divided into features categories of this phenomena as void fraction distribution, velocity profile and flow regime. However, from these methods the high accuracy and short processing time is expected. The continued observation and monitoring of the process abnormalities can provide valuable information about its dynamic state and allow for real-time and automatic monitoring and control. Therefore, the development of advanced process control is one of the most important challenges to keep the flow regime on the given level and for instant and long-term energy saving, quality improvement.

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“…The mechanism for converting this energy takes place in a multiphase systems in wastewater and in a systems inside the HP. Currently, many studies are carried out to increase the efficiency of these processes and intensify the collection of heat from heat exchangers [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Possibility of obtaining wastewater heat from a sewage treatment plant by the means of a heat pump – a case study

Pochwała

Kotas

2018

E3S Web Conf.

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The research was carried out in the mechanical and biological wastewater treatment plant of the city of Prószków in Poland. There is a demand for heat for hot tap water, heating and technological purposes. There is no gas network in the town, therefore it is necessary either to install solid fuel boiler or electrical equipment to generate heat. Instead, a system based on a heat pump (HP) was proposed, which is a pro-ecological and pro-economical alternative. The research involved the measurements necessary to develop energy balances and collection of local climate data. As a result, possible heat from sewage was determined for an exemplary heating season. For the assumed calculation conditions, the maximum amount of heat is 346 kW of which 98% will be used for heating up the sequential biological reactor (SBR) and 2% will be used for social needs. The current SBR temperature in the winter period is 8°C, which significantly limits the process of biological treatment. The optimum temperature range of sewage in SBR is 15–25°C. Based on the collected data, the concept of a HP-based system for generating heat was developed to maintain the optimum temperature. Sewage is a very effective heat source for the HP. This ensures the highest coefficient of performance (COP).

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Recognition of two-phase flow patterns with the use of dynamic image analysis

Cited by 12 publications

References 0 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

Computer methods for non-invasive measurement and control of two-phase flows: a review study

Possibility of obtaining wastewater heat from a sewage treatment plant by the means of a heat pump – a case study

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