Applications of cavitating jets to radioactive scale cleaning in pipes

Bukharin, Nikolay; Hassan, Mouhammad El; Omelyanyuk, Maxim; Nobes, David S.

doi:10.1016/j.egyr.2020.11.049

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…The test chamber consisted of the main body 10, with an outside diameter of 203 mm and an inside diameter of 100 mm, and two lids 11 and 12. Test plates (18) were located inside the test chamber and were attached to the plate holders. Cavitation and hydrodynamic nozzles The water from tank 1 was pumped to the electric centrifugal booster pump 2 after the booster pump water passed through the filter to a plunger pump.…”

Section: Methodsmentioning

confidence: 99%

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Reduction of Energy Consumption for Water Wells Rehabilitation. Technology Optimization

Omelyanyuk

Pakhlyan

Bukharin

et al. 2021

Fluids

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Groundwater wells are widely used in the energy sector, including for drinking water supplies and as water source wells in the oil and gas industry to increase production of natural gas and petroleum. Water well clogging, which can happen to any well for various reasons, is a serious problem that can lead to increased power costs due to a higher head to the pump, a reduction in the flow rate and various drawdown issues. If rehabilitation procedures do not take place in time, this can result in permanent loss of the well, and a new well must be drilled, which is not a sustainable approach. Rehabilitation methods for water wells usually include mechanical and chemical treatments, and even though these methods are well established and have been used for many years we can still observe many abandoned wells which could be rehabilitated. In this study, sets of cavitation generators are developed and used in combination with common conic hydrodynamic nozzles. This combination reduces the pressure in the system and makes the cleaning setup much lighter and more mobile. The designed nozzles were successfully used in hydrodynamic cleaning of four water wells.

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Section: Methodsmentioning

confidence: 99%

“…The selection of the nozzle geometry is the most important step in cavitation jet applications [18,19]. In the present study, the cavitation nozzle design process was achieved in two stages.…”

Section: Water Wells Rehabilitation and Cavitating Jetsmentioning

confidence: 99%

Reduction of Energy Consumption for Water Wells Rehabilitation. Technology Optimization

Omelyanyuk

Pakhlyan

Bukharin

et al. 2021

Fluids

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“…When the gas flow rate increases, the flow pattern changes to agitated flow and annular flow, indicating that the proportion of gas phase increases and the fluctuation in the channel intensifies [11]. As several flow patterns are distinguished by transition lines, there is basically no transition area, so when the two-phase flow rate conditions are changed, the flow pattern may change greatly [12]. Fu et al studied the transition process and characteristics of bubble generation mechanism from "squeezing" to "dripping" in T-shaped microchannels [13].…”

Section: Introductionmentioning

confidence: 99%

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Wang

2023

Front. Phys.

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At present, there are relatively few studies on the slug flow generation mode obtained by exchanging gas-liquid two-phase inlets. In this study, an experimental system combining microfluidic devices and high-speed cameras was used to study the effects of gas-liquid two-phase flow rate, liquid physical parameters, etc., On the characteristic length, generation period and other generation characteristics of slug flow, and dimensionless analysis was conducted to investigate the main factors affecting the characteristic length of gas slug. Results show that 1) when the gas flow rate affects the aeroelastic generation characteristics, the aeroelastic characteristic length increases from 443 μm when the gas flow rate increases changes to 657 μm. The generation period decreases rapidly at first and then the change amplitude slows down. The maximum value of aeroelastic generation frequency is 217 s-1; 2) when studying the effect of different liquid flow rates, increasing the liquid flow rate, the characteristic length of the gas bomb gradually decreases, and the generation period of the gas bomb gradually increases. Aeroelastic characteristic length from 770 μm changes to 378 μm. The range of aeroelastic generation cycle is 4–13.4 ms, and the maximum value of aeroelastic generation frequency is 250 s-1; 3) there is a functional relationship between the ratio of aeroelastic characteristic length to channel size L/d and dimensionless gas-liquid flow ratio Q*, Reynolds number Re, Weber number We: L/d=3.677Q*0.58/Re0.11.

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“…For many industrial applications it is extremely important to determine conditions at which cavitation will start to form and to damage equipment. In some cases, such as in case of high-pressure hydrodynamic jet, which is used for cleaning pipes from salt deposits with radionuclides [4], cleaning heat exchangers, for the deep hole drilling [5] and many other industrial applications [6], it is important to understand how to improve cavitation phenomenon in order to enhance jet's erosion properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Cavitation Number Limitations for Hydrodynamic Cavitation Inception Prediction

Omelyanyuk

Уколов²,

Pakhlyan

et al. 2022

Fluids

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Hydrodynamic cavitation is the formation, growth and subsequent collapse of vapor bubbles in a moving liquid. It is extremely important to determine conditions of cavitation inception and when it starts damaging industrial equipment. In some cases, such as hydrodynamic cleaning it is important to understand how to improve the cavitation phenomenon in order to enhance cleaning properties. The cavitation number is a parameter used to predict cavitation and its potential effects. In this paper we discuss limitations of this parameter and demonstrate that it cannot be considered sufficient to predict cavitation inception and development in the fluid flow. The experimental setup was designed and built to study cavitation inception in various nozzles. RANS SST k–ω turbulence model was used in this study to model turbulent flow in ANSYS Fluent. CFD calculations were compared to experimental results. It was shown that cavitation inception was sensitive to change in nozzle geometry and, since geometrical parameters are not included in cavitation number formula, scenarios of cavitation inception can be different at the same cavitation number.

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Applications of cavitating jets to radioactive scale cleaning in pipes

Cited by 14 publications

References 4 publications

Reduction of Energy Consumption for Water Wells Rehabilitation. Technology Optimization

Reduction of Energy Consumption for Water Wells Rehabilitation. Technology Optimization

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Experimental and Numerical Study of Cavitation Number Limitations for Hydrodynamic Cavitation Inception Prediction

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