Force balance droplet entrainment model for the horizontal stratified flow condition

Bae, Byeonggeon; Kim, Huiyung; Kim, Kyungdoo; Jeong, Jae Jun; Yun, Byong-Jo

doi:10.1016/j.ijheatmasstransfer.2020.120726

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…Secondly, Reynolds numbers and void fractions of both phases are analyzed, and a simplified formula is also deduced, which releases the prediction of liquid film thickness and makes the interfacial friction factor prediction much simple. As a result, both the newly proposed formulas are written as Equation (11) and Equation (12), respectively.…”

Section: Interfacial Friction Factormentioning

confidence: 99%

“…Fundamentally, it was proven by experiments that the flow regime stability was impacted by fluid properties. Theoretically, Kelvin-Helmholtz (KH) instability, entrainment-deposition [12], and secondary flow [13] reveal the interface wave propagation, which is accompanied by flow regime transition. Considering most models mentioned above are deduced or correlated with the two-fluid model, accurate friction factor equations for the two-fluid model are necessary to give the precise calculation of shear stress, which accounts for the errors in flow pattern transition predictions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Gas-Liquid Two-Phase Stratified Flow at High Pressure in a Horizontal Pipe

Wang,

Yu,

Liu

et al. 2024

Energies

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This study investigates wave-stratified flow in a horizontal pipe at high pressure, and flow characteristics are obtained, such as flow pattern map, liquid film thickness, and pressure drop. Compared with a flow pattern map of a gas-liquid two-phase flow carried out at atmosphere, stratified flow zone is depressed with increasing system pressure and the critical gas superficial velocity decreases for smooth-wave-stratified flow transition, while the critical liquid superficial velocity increases for stratified-intermittent transition. On one hand, the compressed air results in an increase in momentum transfer between gas and liquid phases, which accounts for the smaller gas superficial velocity that is encountered in both smooth-wave and stratified-annular flow transition at higher pressure. One the other hand, it slows down the liquid below the crest, and it makes the interface wave crest unstable and split for the vortex shedding behind the wave crest, which accounts for flow regime transition in gas-liquid two-phase flows in pipelines. As a result, stratified-intermittent flow transition is depressed and delayed. The pressure influence on the liquid film profile is analyzed, and relationships between film thickness and dimensionless numbers are studied, such as liquid Weber number and gas Weber number. Friction factors on different interfaces at high pressure are studied, and new empirical formulas are deduced..

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Section: Interfacial Friction Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Gas-Liquid Two-Phase Stratified Flow at High Pressure in a Horizontal Pipe

Wang,

Yu,

Liu

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Several studies developed the entrainment-deposition mechanism for the stratifiedannular flow regime transition [17][18][19]. Moreover, secondary flow, wave mixing, and the sailing boat mechanism have been successfully applied to account for the above-described wave behaviors [20][21][22]. Li et al [23] studied the influence of pumping action on disturbance waves, gas phase secondary flow, entrainment, and droplet deposition, and established a new model for circumferential liquid film thickness distribution, correlated with the stress balance analysis.…”

Section: Introductionmentioning

confidence: 99%

A Novel Model for the Prediction of Liquid Film Thickness Distribution in Pipe Gas-Liquid Flows

Wang,

Yu,

Wang

et al. 2024

FDMP

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A model is proposed for liquid film profile prediction in gas-liquid two-phase flow, which is able to provide the film thickness along the circumferential direction and the pressure gradient in the flow direction. A two-fluid model is used to calculate both gas and liquid phases' flow characteristics. The secondary flow occurring in the gas phase is taken into account and a sailing boat mechanism is introduced. Moreover, energy conservation is applied for obtaining the liquid film thickness distribution along the circumference. Liquid film thickness distribution is calculated accordingly for different cases; its values are compared with other models and available experimental data. As a result, the newly proposed model is tested and good performances are demonstrated. The liquid film thickness distribution in small pipes and inclined pipes is also studied, and regime transition is revealed by liquid film profile evolution. The observed inflection point demonstrates that the liquid film thickness decreases steeply along the circumference, when the circle angle ranges between 30°and 50°for gas-liquid stratified flow with small superficial velocities.

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2024

Handbook on Thermal Hydraulics in Water-Cooled Nuclear Reactors

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Force balance droplet entrainment model for the horizontal stratified flow condition

Cited by 9 publications

References 28 publications

Experimental Study on Gas-Liquid Two-Phase Stratified Flow at High Pressure in a Horizontal Pipe

Experimental Study on Gas-Liquid Two-Phase Stratified Flow at High Pressure in a Horizontal Pipe

A Novel Model for the Prediction of Liquid Film Thickness Distribution in Pipe Gas-Liquid Flows

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