Correlations of void fraction for two-phase refrigerant flow in pipes

Xu, Yu; Fang, Xiande

doi:10.1016/j.applthermaleng.2013.12.032

Cited by 103 publications

(28 citation statements)

References 56 publications

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“…For cases 2 and 3, similar results are obtained. The correlations proposed by Zivi [7], Smith [20] and Rigot [21] presented similar results. In addition, it can be noticed that the homogeneous model gives higher values of void fraction, followed by Domanski and Didion [22].…”

Section: Resultssupporting

confidence: 81%

“…Results showed that Hughmark model [17] presented better results when compared with experimental data over the ranging of the considered charging conditions. Xu and Fang [20] presented a review of correlations applied to compute void fraction for two-phase refrigerant flow in pipes. The authors considered 41 empirical correlations and 1574 experimental data of different refrigerants under different operation conditions in order to perform a comprehensive analysis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical modeling of the thermal–hydraulic behavior of wire-on-tube condensers operating with HFC-134a using homogeneous equilibrium model: evaluation of some void fraction correlations

et al. 2015

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the thermal–hydraulic behavior of wire-on-tube condensers operating with HFC-134a using homogeneous equilibrium model: evaluation of some void fraction correlations

et al. 2015

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“…There are many formulas for determining the void fraction (in this particular case, volumetric steam content) [12,13]. In particular, there are correlations that claim to be universal, covering all conditions that took place in various experiments.…”

Section: Mathematical Model Of Steam-water Flow In a Pipelinementioning

confidence: 99%

“…In this case, it is important to choose the general type of the sought correlations. The most theoretically justified is the type related to the drift model [13,14]. According to the drift model, the gas phase velocity averaged over the cross section is determined by the formula…”

Section: Mathematical Model Of Steam-water Flow In a Pipelinementioning

confidence: 99%

A new program for the hydraulic calculation of steam-water mixture pipelines in geothermal fields

2020

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A new mathematical model of steam-water flow in a pipeline, which takes into account the gravitational effect and satisfies new challenges in the development of geothermal fields with two-phase transportation of the heat carrier is presented. Taking into account the gravitational effect in the upstream flows, a method based on the “drift model”, which determines the steam velocity averaged over the crosssection was used. A similar method is proposed for downstream flows, but it determines the water velocity averaged over the cross-section. In this case, analogs of empirical coefficients were used. These coefficients determined from the condition of equality of parameters calculated using different approaches in a horizontal flow. The model was verified, which showed positive results. The proposed model significantly expands the possibilities of hydraulic calculation of steam-water mixture pipelines in geothermal fields.

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“…Cioncolini and Thome [6] compared their proposed correlation to those of Woldesemayat and Ghajar [5], and Lockhart and Martinelli [7] using 2673 data points containing eight different combinations of gas-liquid and vapor-liquid. Xu and Fang [8] compared 41 void fraction correlations using 1574 data points with 5 different refrigerants. The hydraulic diameters ranged from 0.5 to 10 mm, and the mass fluxes varied between 40 and 1000 kg s −1 m −2 .…”

Section: Introductionmentioning

confidence: 99%

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

Gardenghi

Filho

Chagas

et al. 2020

Fluids

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Void fraction is one of the most important parameters for the modeling and characterization of two-phase flows. This manuscript presents an overview of void fraction measurement techniques, experimental databases and correlations, in the context of microchannel two-phase flow applications. Void fraction measurement techniques were reviewed and the most suitable techniques for microscale measurements were identified along its main characteristics. An updated void fraction experimental database for small channel diameter was obtained including micro and macrochannel two-phase flow data points. These data have channel diameter ranging from 0.5 to 13.84 mm, horizontal and vertical directions, and fluids such as air-water, R410a, R404a, R134a, R290, R12 and R22 for both diabatic and adiabatic conditions. New published void fraction correlations as well high cited ones were evaluated and compared to this small-diameter void fraction database in order to quantify the prediction error of them. Moreover, a new drift flux correlation for microchannels was also developed, showing that further improvement of available correlations is still possible. The new correlation was able to predict the microchannel database with mean absolute relative error of 9.8%, for 6% of relative improvement compared to the second-best ranked correlation for small diameter channels.

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Correlations of void fraction for two-phase refrigerant flow in pipes

Cited by 103 publications

References 56 publications

Numerical modeling of the thermal–hydraulic behavior of wire-on-tube condensers operating with HFC-134a using homogeneous equilibrium model: evaluation of some void fraction correlations

Numerical modeling of the thermal–hydraulic behavior of wire-on-tube condensers operating with HFC-134a using homogeneous equilibrium model: evaluation of some void fraction correlations

A new program for the hydraulic calculation of steam-water mixture pipelines in geothermal fields

Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels

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