A model for pressure loss, film thickness, and entrained fraction for gas–liquid annular flow

Schubring, D.; Shedd, Timothy A.

doi:10.1016/j.ijheatfluidflow.2011.02.010

Cited by 35 publications

(23 citation statements)

References 20 publications

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“…The modified pressure drop model presented in the previous section was compared against experimental data and models of Ansari and Hasan and Kabir [19,20] to validate that the model, though simplified, agrees with Schubring and Shedd's [2] results and predicts better than the other models studied. The modified model is a simplification of the Schubring and Shedd [2] mass balance / two zone approach.…”

Section: Validation Of Modified Pressure Drop Modelmentioning

confidence: 74%

“…Uncertainties were higher in the vertical tube (approximately 15%) due to the decreased wall thickness. Expanding upon their past research, Schubring [2] conducted another series of experiments using planar laser-induced fluorescence (PLIF) in a vertical tube with an annular flow regime of an air-water mixture in order to quantify the liquid film thickness. By introducing fluorescent dye into the water, the thin film layer could be measured after a series of imaging processing.…”

Section: Film Thickness Modelsmentioning

confidence: 99%

“…When compared to other models, this approach proved to match experimental data just as well. A recent model proposed by Schubring and Shedd [2] ignores the simplified approach and presents a model that is predominantly based on mass balance principles and by dividing the model into a base film zone and a wave zone. The model does not assume an average liquid film thickness but requires a base film thickness input and then assumes an average wave film thickness of two times that of the base film.…”

Section: Validation Of New Model With Experimental Datamentioning

confidence: 99%

“…A time-averaged pressure gradient can be calculated based on the intermittency of the liquid film waves. The proposed modified model is compared against the Schubring [2], Ansari [18], and Hasan and Kabir models [19].…”

Section: Validation Of New Model With Experimental Datamentioning

confidence: 99%

“…To simplify the model presented by Schubring and Shedd [2], a model to estimate liquid entrainment fraction was chosen from existing models. Steen, Wallis, Ishii, Mishima and Sawant [7,9,10] were compared against experimental data to determine a suitable choice.…”

Section: Entrainment Model Selectionmentioning

confidence: 99%

See 4 more Smart Citations

An Improved Film Thickness Model for Annular Flow Pressure Gradient Estimation in Vertical Gas Wells

Ma¹,

Stevens²,

Pardy³

et al. 2017

J Pet Environ Biotechnol

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The presence of liquids in natural gas wells increases the pressure loss within the well due to differences in density of the pressure head. In gas, well annular flow, liquid may be present in entrained droplets as well as in the liquid film. Several models have been proposed to predict liquid film thickness in pipes with vertical two-phase annular flow. Earlier models are based limited range of experimental data. The earlier models also require exhaustive iterative procedure to estimate liquid film thickness. On the other hand, the proposed modified film thickness model in this study was developed from a wide range of experimental data. The experimental data covers conditions of superficial liquid velocities ranging from 0.6 to 38.8 cm/s; superficial gas velocities ranging from 13.4 to 110.6 m/s; and diameters ranging from 12 to 51 mm. The proposed model is compared with the available experimental data in the literature. Model predictions are in good agreement with the available experimental data set. The modified film thickness model helps accurate estimation of pressure gradient in vertical annular flow, which in turn is beneficial to the natural gas production industry as it further develops the understanding of production mechanics. An Improved Film Thickness Model for Annular Flow Pressure Gradient Estimation in Vertical Gas

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Section: Validation Of Modified Pressure Drop Modelmentioning

confidence: 74%

Section: Film Thickness Modelsmentioning

confidence: 99%

Section: Validation Of New Model With Experimental Datamentioning

confidence: 99%

Section: Validation Of New Model With Experimental Datamentioning

confidence: 99%

Section: Entrainment Model Selectionmentioning

confidence: 99%

See 3 more Smart Citations

An Improved Film Thickness Model for Annular Flow Pressure Gradient Estimation in Vertical Gas Wells

Ma¹,

Stevens²,

Pardy³

et al. 2017

J Pet Environ Biotechnol

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A study on the modeling of static pressure distribution of wet gas in Venturi

Zhang

et al. 2014

AIChE Journal

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A model for gas-liquid annular and stratified flow through a standard Venturi meter is investigated, using the twophase hydrokinetics theory. The one-dimensional momentum equation for gas has been solved in the axial direction of Venturi meters, taking into consideration the factors including the void fraction, the friction between the two phases and the entrainment in the gas core. The distribution of wet gas static pressure between the two pressure tapings of the Venturi meters has been modeled in the pressure range of 0.1-0.6 MPa. Compared with the experimental data, all the relative deviations of the predicted points by the model were within 615%. As the model is less dependent on the specific empirical apparatus and data, it provides the basis for further establishing a flow measurement model of wet gas which will produce fewer biases in results when it is extrapolated. V C 2014 American Institute of Chemical Engineers AIChE J, 61: 699-708, 2015

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Liquid film flow rate from measurements of disturbance wave characteristics for applications in thin film flow

Chan,

Morse,

Meissner

et al. 2024

Exp Fluids

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This paper discusses the development of a liquid-film thickness measurement technique using laser refractometry and the extension of this technique to enable the measurements of wave height, shape, frequency and velocity. The measurement technique is implemented in a falling water film facility for ease of method validation. The falling-film facility provides optical access to the film which allows the laser refractometry measurements to be compared to high-speed imaging of the waves directly. The total mass flow rate carried by the film (waves and base film) can be computed based on the laser refractometry measurement and compared to the actual liquid flow rate in the falling film facility in order to validate the technique without the complication of droplet entrainment that is typical in annular flow.

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A model for pressure loss, film thickness, and entrained fraction for gas–liquid annular flow

Cited by 35 publications

References 20 publications

An Improved Film Thickness Model for Annular Flow Pressure Gradient Estimation in Vertical Gas Wells

An Improved Film Thickness Model for Annular Flow Pressure Gradient Estimation in Vertical Gas Wells

A study on the modeling of static pressure distribution of wet gas in Venturi

Liquid film flow rate from measurements of disturbance wave characteristics for applications in thin film flow

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