Application of gamma-ray computed tomography for the analysis of gas holdup distributions in centrifugal pumps

Schäfer, Thomas; Bieberle, André; Neumann, Martin; Hampel, Uwe

doi:10.1016/j.flowmeasinst.2015.06.001

Cited by 52 publications

(24 citation statements)

References 26 publications

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“…Among previous visualization experiments, two recent studies from Schäfer et al [68] and Neumann et al [69] are different from the others. They both used a new non-intrusive technique, the so called high resolution computed tomography (HireCT) to accurately measure the distribution of in-situ gas void fractions.…”

Section: Flow Pattern Recognitionmentioning

confidence: 86%

“…Most of these studies used transparent casing to visually observe the pump internal flow patterns. Starting with the original volute-type centrifugal pumps [31,32,[56][57][58][59][60][61][62][63][64][65][66][67][68][69][70], they cover several research topics including flow pattern recognition, bubble movement visualization, mapping transition boundaries etc. Murakami and Minemura [31,32] experimental study first investigated the gas entrainment effect on the hydraulic pump head of a centrifugal pump visually, and associated the degradation of pump performance with gas-liquid flow pattern inside the rotor.…”

Section: Flow Pattern Recognitionmentioning

confidence: 99%

“…Thus, how to characterize the multiphase flow in ESPs has become a challenging topic. Although several technologies [68,69,[73][74][75] to visualize the internal flows inside a centrifugal pump were discussed, they required some modifications on pump geometry and the implementation was difficult to carry out. It required mounting HireCT into the apparatus so that the internal flow structures could be visualized regardless of the opaque pump casing or volute.…”

Section: Flow Pattern Recognitionmentioning

confidence: 99%

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A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

Zhu

Zhang

2018

Energies

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As the second most widely used artificial lift method in petroleum production (and first in produced amount), electrical submersible pump (ESP) maintains or increases flow rate by converting kinetic energy to hydraulic pressure of hydrocarbon fluids. To facilitate its optimal working conditions, an ESP has to be operated within a narrow application window. Issues like gas involvement, changing production rate and high oil viscosity, greatly impede ESP boosting pressure. Previous experimental studies showed that the presence of gas would cause ESP hydraulic head degradation. The flow behaviors inside ESPs under gassy conditions, such as pressure surging and gas pockets, further deteriorate ESP pressure boosting ability. Therefore, it is important to know what parameters govern the gas-liquid flow structure inside a rotating ESP and how it can be modeled. This paper presents a comprehensive review on the key factors that affect ESP performance under gassy flow conditions. Furthermore, the empirical and mechanistic models for predicting ESP pressure increment are discussed. The computational fluid dynamics (CFD)-based modeling approach for studying the multiphase flow in a rotating ESP is explained as well. The closure relationships that are critical to both mechanistic and numerical models are reviewed, which are helpful for further development of more accurate models for predicting ESP gas-liquid flow behaviors.

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Section: Flow Pattern Recognitionmentioning

confidence: 86%

Section: Flow Pattern Recognitionmentioning

confidence: 99%

Section: Flow Pattern Recognitionmentioning

confidence: 99%

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A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

Zhu

Zhang

2018

Energies

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“…Bench simulation experiments [5] are common simulation methods. Thomas Schä fera [6] proposed the method of scanning the gas retention status in a centrifugal pump with high-penetration gamma rays, and then made a quantitative analysis of the pump gas-liquid twophase flow distribution. Bao-cheng Shi [7] proposed an experimental device for measuring the internal flow of solidliquid two-phase in a centrifugal pump based on the particle image velocity method (PIV).…”

Section: Introductionmentioning

confidence: 99%

Experimental research on hydraulic characteristic of centrifugal pump in plateau

Jiang¹,

Zhang²

2017

IJHT

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The hydraulic characteristics of a centrifugal pump change when in a plateau, while the corresponding law is unclear. Therefore, experimental research needs to be undertaken on the hydraulic characteristics of a centrifugal pump in a plateau for a quantitative analysis of the changing law. In this paper, the working status of a centrifugal pump in a plateau was simulated by the method of controlling the inlet vacuum so as to acquire the pressure and the flow data under different working conditions. The corresponding conclusions were reached by using thorough data analysis, which shows that with every 500m increase in altitude, the accompanying pump pressure decreased by about 5%-10%, the flow decreased by about 2%-5% and the overall efficiency decreased by about 2%-9%. This theoretical analysis shows that the increase in pump frictional loss is the fundamental reason for the change in the hydraulic characteristics of a centrifugal pump in a plateau.

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“…The free surface vortex formation can reduce the performance of the hydraulic devices and even damage them if floating matters or gas bubbles are entrained in the flow. The determination of the gas holdup distributions can be obtained only through complex measurement techniques [3]. In particular, gas entrainment phenomena (GE) represent an important safety issues in Sodium-cooled Fast Reactors (SFRs), since the introduction of gas bubbles within the reactor core could result in reactivity insertion accident (RIA).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Free Surface Vortices Driven by Tangential Inlets

Caruso¹,

Cristofano²,

Nobili³

et al. 2016

IJHT

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Particle Image Velocimetry (PIV) measurements have been carried out in order to analyze the structure of free surface vortices in a promoting geometry with two tangential inlets. Velocity fields associated to the free surface vortex have been obtained at different horizontal planes and Reynolds numbers. Average velocity fields have been calculated and tangential velocity profiles have been compared at different vortex stages and measurement planes. The results show that tangential flow is uniform along the vortex axis and it scales well with the average exit velocity. The tangential velocity profiles, in comparison to the potential behavior, show discrepancies especially at large distances from the vortex axis. Vorticity fields and circulation profiles have been also derived from the measured velocity fields and discussed. The circulation profiles increase along the vortex radius even at large distances from the vortex axis, so that the potential solution is not applicable at all. The comparison of tangential velocity and circulation profiles between promoted and free vortices, the last presented in a previous paper, shows that the tangential motion in a driven vortex is more intense and predominant over the sink effect (radial motion), except very close to the tank bottom, as in a forced configuration (i.e. rotating cylindrical tank).

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Application of gamma-ray computed tomography for the analysis of gas holdup distributions in centrifugal pumps

Cited by 52 publications

References 26 publications

A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

A Review of Experiments and Modeling of Gas-Liquid Flow in Electrical Submersible Pumps

Experimental research on hydraulic characteristic of centrifugal pump in plateau

Experimental Investigation on Free Surface Vortices Driven by Tangential Inlets

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