Hydrodynamics analysis in micro-channels of a viscous coupling using gamma-ray computed tomography

Bieberle, André; Schlottke, Jan; Spies, Alexander; Schultheiss, G.F.; Kühnel, Wolfram; Hampel, Uwe

doi:10.1016/j.flowmeasinst.2015.07.008

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…To quantify the local liquid fraction at each in-plane position of the rotor, a well-established high-energy γ-ray CT scanner is used that was applied successfully in the past to discover liquid/gas phase distributions in technical equipment, such as viscous couplings and centrifugal pumps, as well as bubble column reactors, , fixed bed reactors, rotating foam reactors, , and spinning disc reactors . The scanner essentially comprises a collimated Cs 137 isotopic source and an oppositely positioned radiation detector arc containing 320 individual detectors positioned with their focus toward the isotopic source .…”

Section: Methodsmentioning

confidence: 99%

“…However, by applying rotationally synchronized data acquisition, the spatial resolution may become worse due to blurring effects caused by insufficient sampling of the rapidly rotating object. A detailed study on an impeller wheel mockup for centrifugal pump applications revealed a global holdup accuracy of 1% . As the CT scanner provides a detector sampling frequency of f samp = 22 kHz, sufficient projection data are acquired even at the highest rotational speed of 1800 rpm, i.e., N proj = 22 kHz/30 Hz = 733 projections, avoiding blurring effects in the reconstructed images.…”

Section: Methodsmentioning

confidence: 99%

“…A detailed study on an impeller wheel mockup for centrifugal pump applications revealed a global holdup accuracy of 1%. 28 As the CT scanner provides a detector sampling frequency of f samp = 22 kHz, sufficient projection data are acquired even at the highest rotational speed of 1800 rpm, i.e., N proj = 22 kHz/30 Hz = 733 projections, avoiding blurring effects in the reconstructed images. Thus, a suitable scanning time, i.e., projection per angular packing position averaging time, was determined in order to provide correct statistics.…”

Section: γ-Raymentioning

confidence: 99%

See 2 more Smart Citations

Analysis of Flow Patterns in Structured Zickzack Packings for Rotating Packed Beds Using γ-Ray Computed Tomography

Loll,

Nordhausen,

Bieberle

et al. 2023

Ind. Eng. Chem. Res.

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Rotating packed beds (RPBs) are increasingly used in academia and industry for separation processes, but a lack of knowledge about fluid dynamics and liquid maldistribution still limits our understanding of the mass transfer inside. Recently, structured Zickzack packings (ZZ packings) were designed that promise to provide a homogeneous liquid distribution throughout the packing volume. In this study, the fluid dynamics of a water−air system in ZZ packings were characterized at atmospheric pressure and 20 °C. For decreasing rotational speeds, a strongly increasing wet pressure drop was observed below 500 rpm due to the formation of a liquid wreath in front of the inner packing edge, and flooding of the rotor eye was visually detected at rotational speeds lower than 300 rpm. At rotational speeds greater than the flooding limit, the fluid dynamics of a single ZZ packing were found to be equal to those of a stacked two-level ZZ packing. In addition, γ-ray computed tomography (CT) was used to noninvasively investigate the liquid distribution inside the rotating ZZ packing at multiple scanning planes along the packing height for selected operating conditions. The scans revealed that liquid maldistribution occurred at rotational speeds of less than 1200 rpm, while the liquid was perfectly distributed throughout the packing volume at rotational speeds greater than 1200 rpm.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: γ-Raymentioning

confidence: 99%

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Analysis of Flow Patterns in Structured Zickzack Packings for Rotating Packed Beds Using γ-Ray Computed Tomography

Loll,

Nordhausen,

Bieberle

et al. 2023

Ind. Eng. Chem. Res.

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“…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%

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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“…Based on this, the HireCT scanner was successfully applied for investigations of gas-liquid flows, e.g. in an electrically heated rod bundle [16], novel chemical reactor prototypes [7,17,18] and hydraulic couplings [19,20]. In 2013, our group presented a smaller but more compact gamma ray CT scanner (CompaCT).…”

Section: Introductionmentioning

confidence: 99%

Multi-channel Detector Module for Multi-energy Gamma Ray Computed Tomography

Bieberle

Berger

Stave

et al. 2022

J Sign Process Syst

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In this paper an enhanced signal processing electronics for an existing multi-channel detector module for gamma ray computed tomography is presented. The detector electronics is able to evaluate gamma photon energies by measuring pulse duration times, which makes it perfectly suitable for attenuation measurements with multi-energy and/or multiple isotopic sources. The duration time of each voltage pulse generated by a gamma photon within the radiation detector is measured using a complex programmable logic device. A sophisticated logic circuit for eight detector channels is designed to acquire the pulse duration time spectra in a total of 256 channels per detector channel in parallel. This paper introduces the basic concept, describes the general and a specific CPLD design, provides an analysis of the accuracy and presents measured pulse duration time spectra.

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Hydrodynamics analysis in micro-channels of a viscous coupling using gamma-ray computed tomography

Cited by 11 publications

References 23 publications

Analysis of Flow Patterns in Structured Zickzack Packings for Rotating Packed Beds Using γ-Ray Computed Tomography

Analysis of Flow Patterns in Structured Zickzack Packings for Rotating Packed Beds Using γ-Ray Computed Tomography

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

Multi-channel Detector Module for Multi-energy Gamma Ray Computed Tomography

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