Numerical Prediction of Flow Patterns in Bubble Pumps

Benhmidene, Ali; Chaouachi, Béchir; Bourouis, Mahmoud; Gabsi, Slimane

doi:10.1115/1.4003664

Cited by 18 publications

(9 citation statements)

References 31 publications

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“…According to the literature on gas-liquid two-phase models, the two-fluid model was most widely adopted because of its high calculation accuracy compared to other models such as mixture model and drift flow model, etc. [18,19]. However, the selection and computational analysis of interphase forces are also crucial to the two-fluid model.…”

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confidence: 99%

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Zhang

Zahid

et al. 2018

Energies

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Abstract:The performance of multiphase pumps has a remarkable influence on the related industrial application. In order to understand the flow field and gas-liquid phase interaction characteristics of a multiphase rotodynamic pump, detailed numerical analysis of the pump with a medium of air-water combination was carried out for the whole flow passage by means of a structured mesh using ICEM_CFD and TurboGrid. The results for 21% inlet gas void fraction (IGVF = 21%) condition showed that the magnitude ratio of non-drag forces to drag in impeller and guide vane passages was generally less than 1, whereas it was always less than 0.2 for the magnitude ratio of turbulent dispersion force to drag. When the IGVF was increased, the variation range of interphase forces in the impeller was greater than that in the guide vane. In addition, the gas in the impeller mainly accumulated near the suction surface in the outlet region. Further, with increased IGVF, the degree of aggregation increased as well as the gas inhomogeneity, and consequently the interphase forces in the impeller increased. Due to the divergent structure of the guide vane, obvious vortexes emerged at the hub and gradually moved toward the blade pressure surface along the streamwise direction.

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confidence: 99%

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Zhang

Zahid

et al. 2018

Energies

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“…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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“…However, for a heat flux value of 20 kW Á m À2 , the liquid velocity increases sharply and attains a maximum value at a position 0.6 m along the tube length, and then decreases due to the transition flow regime. This indicates the importance of flow regime transition in the bubble pump (Benhmidene et al, 2011c). Figure 6 shows the variation of pressure drop along the tube for different heat flux values.…”

mentioning

confidence: 92%

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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Numerical Prediction of Flow Patterns in Bubble Pumps

Cited by 18 publications

References 31 publications

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

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

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

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