Gas evolution rates – A critical uncertainty in challenged gas-liquid separations

Lavenson, David M.; Kelkar, Aniruddha V.; Daniel, Alden B.; Mohammad, Sayeed A.; Kouba, Gene; Aichele, Clint P.

doi:10.1016/j.petrol.2016.10.005

Cited by 28 publications

(38 citation statements)

References 108 publications

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“…Moreover, the flow of the gas bubble is a fundamental aspect relevant in environmental applications -studies of the release of underwater methane, which contribute to the global greenhouse effect [13,14]. Understanding the interaction between gas bubbles moving in oils would be useful in optimizing the devices for degassing or transporting oils [15]. The present experiment was carried out with using twin nozzles with independent air supply system in our opinion such experimental stand contraction allows as to observe only the hydrodynamic interactions between departing bubbles.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of self-organising bubble departures from twin nozzles

2019

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The nonlinear dynamics of self-organising bubble departures from twin nozzles in engine oils was analysed. Air bubbles were generated from twin brass nozzles with an inner diameter equal to 1 mm. The flow of bubbles in bubble chains was recorded using high-speed camera. The time series of air pressure oscillations and signal from laser-phototransistor identifying the presence of bubbles over the nozzles outlet were recorded simultaneously. The self-organising bubble departures were observed and their stability was analysed. It was found that self-organising bubble departures become unstable because of successive (during subsequent bubble departures) decrease of the mean air pressure in one of the nozzle air supply system. It was shown that instability of selforganising bubble departures leads to equalization of pressures in both nozzles air supply systems which causes that simultaneous bubble departures appear. In the present experiment, this process was repeated in a cyclic and chaotic way. It was shown that stable selforganising bubble departures are accompanied by periodic air pressure oscillations in one of the nozzles and chaotic air pressure oscillations in the second one. Keywords Bubble Á Bubble chain Á Self-organising bubble departures Á Nonlinear data analysis

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of self-organising bubble departures from twin nozzles

2019

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“…The bubbles-bubbles and bubbles-liquid interactions occur in many technological applications such as hydrocarbon industries, chemical processes, bubble column reactors or boiling heat transfer. Understanding the interactions between moving gas bubbles in oils would be useful in optimising the devices for degassing or transporting oils (Lavensona et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Non-Linear Analysis of Air Pressure Fluctuations During Bubble Departure Synchronisation

Dzienis

Mosdorf

Wyszkowski

et al. 2019

Acta Mechanica Et Automatica

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In the recent paper, non-linear methods of data analysis were used to study bubble departure synchronisation. In the experiment, bubbles were generated in engine oils from two neighbouring brass nozzles (with an inner diameter of 1 mm). During the experiment, the time series of air pressure oscillations in the air supply system and voltage changes on phototransistor were recorded. The analysis of bubble departure synchronisation was performed using a correlation coefficient. The following methods of non-linear data analysis are considered. Fast Fourier Transformation, autocorrelation, attractor reconstruction, correlation dimension, largest Lyapunov exponent and recurrence plot analysis were used to examine the correlation between bubbles behaviour and character of pressure fluctuations. Non-linear analysis of bubble departure synchronisation revealed that the way of bubble departures from two neighbouring nozzles does not depend simply on the character of pressure fluctuations in the nozzle air supply systems. The chaotic changes of the air pressure oscillations do not always determine the chaotic bubble departures.

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“…difficult (Taran 2005) and requires significant assumptions for mathematical modeling (Brennen 2005;Lavenson et al 2016;Daniel 2018). Measuring water flow that contains entrained gas introduces error into conventional measuring devices, such as paddlewheel, pressure drop, turbine style, etc.…”

Section: Introductionmentioning

confidence: 99%

An Instrument for the Determination of a Hydropneumograph in a Bubbling Spring

Agnew¹,

Halihan

Holtzhower

et al. 2019

Groundwater

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In order to enable greater accuracy in the determination of the mass discharge of gas and water‐gas ratios (WGR) in groundwater from springs, we have developed a field‐deployable instrument using commercially available components to independently measure the gas and water mass flow rates in springs with bubbling mixed‐phase flow. Collecting and measuring the free gas phase will allow for further compositional analysis that may be useful in improving gas‐derived parameters such as recharge temperature and age, as well as quantification of methanogenesis and flux of crustal/mantle gasses. By installing a phase separator at the spring discharge, a thermal mass flow sensor is utilized to measure the gas flow rate (ebullition + flux) generated from a spring. The water flow rate is determined by a standard weir. Field performance of the device was tested on a spring discharging from the Arbuckle‐Simpson aquifer near the town of Connerville in south‐central Oklahoma, USA.

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Gas evolution rates – A critical uncertainty in challenged gas-liquid separations

Cited by 28 publications

References 108 publications

Nonlinear dynamics of self-organising bubble departures from twin nozzles

Nonlinear dynamics of self-organising bubble departures from twin nozzles

Non-Linear Analysis of Air Pressure Fluctuations During Bubble Departure Synchronisation

An Instrument for the Determination of a Hydropneumograph in a Bubbling Spring

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