Optical Measurement of Base Film Thickness in Annular Two-Phase Flow

Schubring, D.; Ashwood, Andrea C.; Hurlburt, Evan T.; Shedd, Timothy A.

doi:10.1115/fedsm2008-55184

Cited by 3 publications

(4 citation statements)

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“…In order to determine the OR volume Shedd and Newell (1998) proposed a non-intrusive, automated, optical film thickness measurement technique to be used with a wide range of fluids and flow configurations. Later, Bai and Newell (2002), Shedd and Newell (2004), and Schubring et al (2009) used a similar approach to describe the characteristics of annular two-phase viscous flow of air and water or air and 300 SUS alkybenzene oil. Extensive experimental flow visualization in horizontal and vertical pipes was required, and the oil film thicknesses were correlated with the oil mass flow rates, vapor velocity, and pipe diameter.…”

Section: Introductionmentioning

confidence: 99%

Oil retention in a microchannel type condenser and its effects on heat transfer rate performance and on the pressure drop

Yatim

Deokar

Cremaschi

2016

Science and Technology for the Built Environment

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Oil retention in a microchannel type condenser was measured and its effect on heat transfer rate performance and pressure drop were analyzed for refrigerants R410A and R134a condensation. The heat exchanger was a 2-pass aluminum louvered-fin type consists of multiports rectangular channels with hydraulic diameter of 0.06 inch (1.7 × 10 −3 m). The refrigerants and Polyolester oil mixtures were studied at saturation temperature from 85 to 130 • F (29 to 54 • C) and oil mass fraction (OMF) was varied from 0 to 6 wt.%. Oil retained in the condenser was found to be strongly dependent on the OMF and it was measured up to 11% of its internal volume. The oil retained for high mass fluxes were higher than those for low mass fluxes. The effect of mass flux on the oil retention was small for low OMFs but became more evident for OMFs of 3 wt.% and higher. The oil penalized the heat transfer capacity by as much as 10% when the OMF was 3 wt.%. For medium temperature of 105 • F (41 • C) the heat transfer capacities were fairly constant. Nevertheless, the high refrigerant-oil mixture viscosity of the liquid phase increased the pressure losses up to 19% compared to that in oil free conditions.

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Section: Introductionmentioning

confidence: 99%

Oil retention in a microchannel type condenser and its effects on heat transfer rate performance and on the pressure drop

Yatim

Deokar

Cremaschi

2016

Science and Technology for the Built Environment

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show abstract

“…Results from the new model were compared with results presented by Schubring [1,22], Alamu and Azzopardi and Butterwoth [26,27]. Each author has developed their respective film thickness models based on a series of experiments that use diameters ranging from 19 mm to 31.75 mm.…”

Section: Validation Of New Model With Experimental Datamentioning

confidence: 99%

“…These data sets come from the works of Schubring [1,[21][22][23] the +/-20% tolerances. Therefore, the comparison between the new film thickness model and experimental film thickness data reveals that the model is indeed an appropriate approximation of experimental film thickness values for wider range of experimental data.…”

Section: New Film Thickness Modelmentioning

confidence: 99%

“…There are numerous models to determine film thickness and entrainment. Schubring [1] completed a series of experiments using optical techniques, which measured base film thickness in annular two-phase flow. In these experiments horizontal and vertical conditions were examined and a correlation for each case was determined; the first being an empirical fit of the experimental data, and the second using a critical friction factor alongside an empirical fit.…”

Section: Film Thickness Modelsmentioning

confidence: 99%

See 1 more Smart Citation

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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An optimize empirical correlations for liquid film thickness and interfacial friction factor in vertical gas-liquid annular flow

Ghafouri

Kosarineia

et al. 2023

Journal of the Taiwan Institute of Chemical Engineers

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Optical Measurement of Base Film Thickness in Annular Two-Phase Flow

Cited by 3 publications

References 0 publications

Oil retention in a microchannel type condenser and its effects on heat transfer rate performance and on the pressure drop

Oil retention in a microchannel type condenser and its effects on heat transfer rate performance and on the pressure drop

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

An optimize empirical correlations for liquid film thickness and interfacial friction factor in vertical gas-liquid annular flow

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