Estimating gas holdup via pressure difference measurements in a cocurrent bubble column

Tang, Chaowei; Heindel, Theodore J.

doi:10.1016/j.ijmultiphaseflow.2006.02.008

Cited by 45 publications

(31 citation statements)

References 28 publications

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“…In support of the Lockhart and Martinelli correlation, Merchuk and Stein [4] came up with another correlation by including the impact of all the energies acting on the multiphase flow mechanism quantified as pressure drop due to frictional force. Tang and Heindel [5] further stated that pressure drop of two-phase flow was partially because of mechanisms within the system which caused energy losses, namely; the frictional force existing between flowing fluid and conduit internal surface. It also came from turbulence between the liquid and the gas phases, due to the slip ratio, which was the difference in velocities of two phases.…”

Section: Introductionmentioning

confidence: 99%

Void fraction measurement of gas–liquid two-phase flow from differential pressure

Jia

Babatunde

Wang

2015

Flow Measurement and Instrumentation

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Abstract:Void fraction is an important process variable for the volume and mass computation required for transportation of gasliquid mixture in pipelines, storage in tanks, metering and custody transfer. Inaccurate measurement would introduce errors in product measurement with potentials for loss of revenue. Accurate measurement is often constrained by invasive and expensive online measurement techniques. This work focuses on the use of cost effective and non-invasive pressure sensors to calculate the gas void fraction of gas-liquid flow. The differential pressure readings from the vertical upward bubbly and slug air-water flow are substituted into classical mathematical models based on energy conservation to derive the void fraction. Electrical Resistance Tomography (ERT) and Wire-mesh Sensor (WMS) are used as benchmark to validate the void fraction obtained from the differential pressure. Consequently the model is able to produce reasonable agreement with ERT and WMS on the void fraction measurement. The effect of the wall friction on the mathematical models is also investigated and discussed. It is concluded the friction loss cannot be neglected, particularly when gas void fraction is less than 0.2.

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Section: Introductionmentioning

confidence: 99%

Void fraction measurement of gas–liquid two-phase flow from differential pressure

Jia

Babatunde

Wang

2015

Flow Measurement and Instrumentation

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“…[1][2][3][4][5][6][7][8][9][10][11] The total pressure drop in the riser corresponds to the hydrostatic head and is related to riser gas holdup. The riser gas holdup measurement was verified by use of the bed expansion method to ensure its accuracy.…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Jones

Heindel

2010

Ind. Eng. Chem. Res.

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Gas holdup and superficial liquid velocity in the downcomer and riser are studied for an external loop airlift reactor with a downcomer-to-riser area ratio of 1:16. Two downcomer configurations are investigated over a range of superficial gas velocities (0.5 ≤ UG ≤ 20 cm/s) using three aeration plate open area ratios (A = 0.62, 0.99, and 2.22%). These results are compared to a bubble column operated with similar operating conditions. Gas holdup in both the riser and downcomer are found to increase with increasing superficial gas velocity. Results show that riser gas holdup varies slightly with downcomer configuration, while a considerable variation is observed for downcomer gas holdup. The superficial liquid velocity varies considerably for the two downcomer configurations and is a function of superficial gas velocity and flow conditions in the downcomer. Observed variations are independent of aeration plate open area ratio. Gas holdup and superficial liquid velocity in the downcomer and riser are studied for an external loop airlift reactor with a downcomer-to-riser area ratio of 1:16. Two downcomer configurations are investigated over a range of superficial gas velocities (0.5 e U G e 20 cm/s) using three aeration plate open area ratios (A ) 0.62, 0.99, and 2.22%). These results are compared to a bubble column operated with similar operating conditions. Gas holdup in both the riser and downcomer are found to increase with increasing superficial gas velocity. Results show that riser gas holdup varies slightly with downcomer configuration, while a considerable variation is observed for downcomer gas holdup. The superficial liquid velocity varies considerably for the two downcomer configurations and is a function of superficial gas velocity and flow conditions in the downcomer. Observed variations are independent of aeration plate open area ratio.

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“…(2) accounts for the effects of wall shear stress but neglects the effect of liquid acceleration due to void changes that may influence gas holdup in cocurrent bubble columns (Hills, 1976;Merchuk and Stein, 1981); however, these effects are estimated to be negligible for the conditions of this study (Tang and Heindel, 2006a). The overall column gas holdup is defined as = ( 2 + 3 )/2, the average gas holdup in the middle two sections.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of fiber length distribution on gas holdup in a cocurrent air–water–fiber bubble column

Tang¹,

Heindel²

2007

Chemical Engineering Science

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Estimating gas holdup via pressure difference measurements in a cocurrent bubble column

Cited by 45 publications

References 28 publications

Void fraction measurement of gas–liquid two-phase flow from differential pressure

Void fraction measurement of gas–liquid two-phase flow from differential pressure

Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Effect of fiber length distribution on gas holdup in a cocurrent air–water–fiber bubble column

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