Evaluation of frictional pressure drop correlations for two-phase flow in pipes

Xu, Yu; Fang, Xiande; Su, Xianghui; Zhou, Zhanru; Chen, Weiwei

doi:10.1016/j.nucengdes.2012.08.007

Cited by 115 publications

(24 citation statements)

References 47 publications

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“…At high pressure gradient values with hydraulic diameter tube of 1.16 mm Cavallini et al [17] correlation slightly underestimates the experimental data for R134a, the prediction is quite sharp for R32 over the whole range. This is in agreement with the conclusions of Xu et al [44] who reported an extensive work with 3480 pressure drop data points collected from literature in different test modes (adiabatic, condensation and evaporation) and hydraulic diameters in the range 0.0695e14 mm. They found that the Cavallini correlation captured their evaporation data with reasonable accuracy.…”

Section: Empirical or Separate Flow Methodssupporting

confidence: 93%

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids

Ramírez-Rivera

López-Belchí

Vera-García

et al. 2015

International Journal of Thermal Sciences

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Section: Empirical or Separate Flow Methodssupporting

confidence: 93%

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids

Ramírez-Rivera

López-Belchí

Vera-García

et al. 2015

International Journal of Thermal Sciences

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“…The accuracy criteria of ±30 % is based on the overall performance of the correlations and is consistent with the assessment done by other investigators such as [84,85,96,103 (used ±50 %)] and (Xu et al [108]). The two phase pressure drop data for air water is divided into different ranges of the pipe diameter for each pipe orientation.…”

supporting

confidence: 82%

Flow Patterns, Void Fraction and Pressure Drop in Gas-Liquid Two Phase Flow at Different Pipe Orientations

Ghajar

Bhagwat

2014

Frontiers and Progress in Multiphase Flow I

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This chapter presents an insightful discussion on flow patterns, void fraction and phenomenon of two phase frictional pressure drop in gas-liquid two phase flow. The flow structure of different flow patterns observed in gas-liquid two phase flow at various pipe orientations are described with the aid of flow visualization. This chapter is helpful in understanding the impact of varying flow patterns, pipe diameter and pipe orientation on the void fraction and two phase pressure drop. Additionally, a brief overview of the void fraction, its dependency on the flow patterns and its influence on the hydrostatic pressure drop is presented. A brief synopsis of the two phase void fraction and frictional pressure drop correlations available in the literature is presented. The performance of these correlations is assessed against a comprehensive database for air-water and refrigerant two phase flow conditions. Based on this detailed analysis, the top performing void fraction and pressure drop correlations are identified and recommended for use for these fluid combinations in different two phase flow situations. Finally, application of the recommended correlations is presented in the form of solved problems. It is expected that these solved problems will give readers an idea of selection and implementation of appropriate correlations for different two phase flow conditions.

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“…As liquid is added, the viscosity of the gas-liquid mixture increases and hence it is expected that the pressure gradient rises. 20 Nevertheless, studies of adiabatic gas-liquid flow mostly focus on steady flow through uniform channels 3,40 whereas a channel with time-varying constriction degree is more pertinent for glottal flow during speech production. Although it has been shown from a dimensional analysis 10,35,37 of single-phase airflow under glottal conditions (Reynolds number Re ≤ 5 × 10 3 , Strouhal number Sr ≤ 0.1, and Mach number Ma ≤ 0.12) that incompressible, laminar, and quasisteady flow can be considered, the presence of a time-varying constriction and hence pulsating jet might affect the mixture viscosity.…”

Section: Introductionmentioning

confidence: 99%

Pressure drop for adiabatic air-water flow through a time-varying constriction

2018

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The pressure drop for air-water flow within a vertical rigid channel containing a severe time-varying constriction is studied for different forcing frequencies f c ∈ {1, 6, 10} Hz after water (0 up to 5 ml) is injected upstream. The pressure drop at the minimum aperture is observed experimentally and can be modeled with a quasi-steady one-dimensional approach and viscous mixing during the closing and opening phase. It is found that the flow can be regarded as gas dominated during the closing phase. During the opening phase, mixing enhances as f c > 1 Hz, which emphasizes the contribution of water and water droplets to the viscous mixture. Eventually, for f c = 10 Hz and greater water volumes (≥3 ml), mixing is further increased so that the flow becomes homogeneous and turbulent during the opening phase. Assessed conditions are relevant to flow through the human glottis.

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Evaluation of frictional pressure drop correlations for two-phase flow in pipes

Cited by 115 publications

References 47 publications

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids

Flow Patterns, Void Fraction and Pressure Drop in Gas-Liquid Two Phase Flow at Different Pipe Orientations

Pressure drop for adiabatic air-water flow through a time-varying constriction

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