Numerical analysis of refrigerant flow along non-adiabatic capillary tubes using a two-fluid model

Seixlack, André Luiz; Barbazelli, Marcos Rogério

doi:10.1016/j.applthermaleng.2008.03.012

Cited by 25 publications

(8 citation statements)

References 12 publications

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“…The two-fluid model can be considered the most detailed and accurate macroscopic formulation of the thermo-fluid dynamics of two-phase flow (Levy et al, 2006;Seixlak and Barbazelli, 2009;Yang and Zhang, 2005). This model treats the general case of modeling each phase or component as a separate fluid with its own set of governing balance equations.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Boiling Two-Phase Flow in the Bubble Pump of Diffusion-Absorption Refrigeration Cycles

Benhmidene

Chaouachi

Gabsi

et al. 2014

Chemical Engineering Communications

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This work presents a numerical model developed to simulate steady-state refrigerant flow along a tube of a bubble pump at operating conditions of interest for diffusion-absorption refrigeration systems. The flow is considered one-dimensional, and non-metastable flow is neglected. The two-fluid model was employed to simulate the two-phase flow, considering the hydrodynamic nonequilibrium between the liquid and the vapor phases. Comparisons were made for void fraction versus vapor quality using the homogeneous model, the Rouhani and Axelsson drift model, and the Zivi annular model. The results show a great similarity among the values achieved in the present work and those calculated using the Rouhani and Axelsson and Zivi correlations. On the basis of the numerical simulations, a detailed description of the flow characteristics was obtained. The influence of the heat source on the flow characteristics was numerically examined.

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Section: Introductionmentioning

confidence: 99%

Modeling of Boiling Two-Phase Flow in the Bubble Pump of Diffusion-Absorption Refrigeration Cycles

Benhmidene

Chaouachi

Gabsi

et al. 2014

Chemical Engineering Communications

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show abstract

“…The two-fluid model can be considered the most detailed and accurate macroscopic formulation of the thermofluid dynamics of two-phase flow (Levy et al, 2006;Yang and Zhang, 2005;Seixlack and Barbazelli, 2009;Benhmidene et al, 2011). This model treats the general case by modeling each phase or component as a separate fluid with its own set of governing balance equations.…”

Section: Mathematical Modeling 21 Two-fluid Formulationmentioning

confidence: 99%

Interphase force analysis for air-water bubbly flow in a multiphase rotodynamic pump

Zhu

Cao

2015

Engineering Computations

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(2015),"Comparative study of SGS models for simulating the flow in a centrifugal-pump impeller using single passage", Engineering Computations, Vol. 32 Iss 7 pp. 2120-2135 https://doi.org/10.1108/EC-09-2014-0193 Access to this document was granted through an Emerald subscription provided by All users group For AuthorsIf you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.*Related content and download information correct at time of download. Purpose -Interphase forces between the gas and liquid phases determine many phenomena in bubbly flow. For the interphase forces in a multiphase rotodynamic pump, the magnitude analysis was carried out within the framework of two-fluid model. The purpose of this paper is to clarify the relative importance of various interphase forces on the mixed transport process, and the findings herein will be a base for the future study on the mechanism of the gas blockage phenomenon, which is the most challenging issue for such pumps. Design/methodology/approach -Four types of interphase forces, i.e. drag force, lift force, virtual mass force and turbulent dispersion force (TDF) were taken into account. By comparing with the experiment in the respect of the head performance, the effectiveness of the numerical model was validated. In conditions of different inlet gas void fractions, bubble diameters and rotational speeds, the magnitude analyses were made for the interphase forces.Findings -The results demonstrate that the TDF can be neglected in the running of the multiphase rotodynamic pump; the drag force is dominant in the impeller region and the outlet extended region. The sensitivity analyses of the bubble diameter and the rotational speed were also performed. It is found that larger bubble size is accompanied by smaller predicted drag but larger predicted lift and virtual mass, while the increase of the rotational speed can raise all the interphase forces mentioned above. Originality/value -This paper has revealed the magnitude information and the relative importance of the interphase forces in a multiphase rotodynamic pump.

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“…(6). 8 . These values serve to preprocess the inputs and postprocess the output, using the described relations (5) and (6), whenever the presented network is used.…”

Section: Artificial Neural Network Correlationmentioning

confidence: 99%

“…These values serve to preprocess the inputs and postprocess the output, using the described relations (5) and (6), whenever the presented network is used. Normalized output parameter 8 π , for ANN correlation with two neurons in the hidden layer, is determined from Eq. (7).…”

Section: Artificial Neural Network Correlationmentioning

confidence: 99%

“…Another approach, employed for instance by Seixlack and Barbazelli [8], is based on a two-fluid model when the hydrodynamic and thermodynamic non-equilibrium between liquid and vapor phases is considered. The most accurate simulations including the -4 -metastable region of capillary flow were prepared by Guobing and Yufeng [9], Wongwises et al [10] and García-Valladares et al [11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

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Mass flow rate correlation for two-phase flow of R218 through a capillary tube

Vinš

Vacek

2009

Applied Thermal Engineering

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This paper presents some experimental results of refrigerant two-phase flow through a capillary tube. The data was obtained for fluorinert refrigerant R218, which is used in some special vapor cooling circuits, e.g. in various particle detectors at the CERN international research centre. An analytical correlation for mass flow rate of R218 was prepared on the bases of dimensionless parameters derived from the Buckingham π-theorem. Two approaches were compared: (a) the conventional power law function and (b) correlation determined with the use of an artificial neural network. Measured data were also correlated with other mass flow rate correlations presented in literature.

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Numerical analysis of refrigerant flow along non-adiabatic capillary tubes using a two-fluid model

Cited by 25 publications

References 12 publications

Modeling of Boiling Two-Phase Flow in the Bubble Pump of Diffusion-Absorption Refrigeration Cycles

Modeling of Boiling Two-Phase Flow in the Bubble Pump of Diffusion-Absorption Refrigeration Cycles

Interphase force analysis for air-water bubbly flow in a multiphase rotodynamic pump

Mass flow rate correlation for two-phase flow of R218 through a capillary tube

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