Liquid distribution and hold-up measurement in counter current flow packed column by electrical capacitance tomography

Wu, Hao; Buschle, Bill; Yang, Yunjie; Tan, Chao; Dong, Feng; Jia, Jiabin; Lucquiaud, Mathieu

doi:10.1016/j.cej.2018.07.016

Cited by 27 publications

(13 citation statements)

References 36 publications

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“…ECT was employed to measure the liquid distribution of the liquid hold-up inside the packed column. The methodology used in this work has been fully characterized by Wu et al [21], which investigated the intrinsic performances of the apparatus and accuracy of the reconstruction algorithm. The ECT system [22] shown in Fig.…”

Section: Principle Of Ectmentioning

confidence: 99%

“…Similarly, ECT was used to investigate pulse flow and pulse velocity in co-current trickle bed reactors [15], solid-phase distributions in a gas-solid fluidized bed [16,17] and determination of the onset of bubbling and slugging in a fluidized bed [18]. Although ECT has been successfully used to measure liquid hold-up and distribution inside the packed column [19][20][21], little attention has been paid so far to the imaging of liquid distribution under flooding phenomenon, which is the motivation of this study. This study had two purposes: (1) a qualitative study of ECT images to discover liquid distribution in a countercurrent flow packed column at different flow regime; (2) a quantitative study of capacitance data provided by the ECT to evaluate a relationship between flooding and a flooding index (Pf).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flow regime transition in countercurrent packed column monitored by ECT

Li¹,

Chen²,

Yang³

et al. 2021

Chemical Engineering Journal

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Section: Principle Of Ectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow regime transition in countercurrent packed column monitored by ECT

Li¹,

Chen²,

Yang³

et al. 2021

Chemical Engineering Journal

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“…One such alternative method utilizes optical technologies, e.g., tomography, that enables observational evaluation of interfacial areas, liquid holdups, and gas‐liquid distributions 17. Particular examples of tomographic approaches include electrical resistance tomography, X‐ray computer tomography, and electrical capacitance tomography 18, 19. A second alternative is numerical simulations through design or computational fluid dynamics (CFD) software.…”

Section: Literature Surveymentioning

confidence: 99%

Joint Method for the Experimental and Computational Characterization of Ammonia Absorption Columns

Allenbrand

2021

Chem Eng & Technol

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Well‐designed absorption columns are indispensable to industry. A prototypical system is the absorption of gaseous NH3. This experiment employed the method of transfer units where collection of vapor (V) and liquid (L) flow rates and concentrations enabled the characterization of the number of transfer units (NTU), height of transfer unit (HTU), and overall gas phase mass transfer coefficient (Ky). A nonmonotonic relationship between V, L, NTU, and HTU values was found; Ky showed a monotonic relationship with V and L. Computer‐simulated, correlation‐based, and experimental NTU, HTU, and Ky values demonstrated close numerical similarities. This experiment highlighted the importance of a combined empirical, theoretical, and simulation approach in achieving more reliable results from absorption column analysis.

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“…The flow parameters including phase distribution, void fraction, interfacial area concentration (IAC), bubble size, velocity, etc. of two-phase flow have great impacts on the heat and mass transfer characteristics, the reaction efficiency and operation safety of multiple chemical applications [11][12][13][14][15]. Hence, it is particularly necessary to develop and utilize accurate, fast and convenient methods to explore the two-phase flow details.…”

Section: Introductionmentioning

confidence: 99%

A New Vector-Based Signal Processing Method of Four-Sensor Probe for Measuring Local Gas–Liquid Two-Phase Flow Parameters Together with Its Assessment against One Bubbly Flow

Guo

Zhang

et al. 2020

Applied Sciences

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A multiphase flow measurement technique plays a critical role in the studies of heat and mass transfer characteristics and mechanism of the gas–liquid two-phase, the practical measurement of the gas–liquid flow and the improvement of multiphase theoretical models. The four-sensor electrical probe as an emerging measurement method has been proved to be able to get the local flow parameters of multi-dimensional two-phase flow. However, few studies have been reported using the four-sensor probe to obtain the interface information (e.g., the interface direction and velocity). This paper presents a new signal processing method by which the interface direction and velocity can be obtained, besides void fraction, interfacial area concentration (IAC) and bubble chord length. The key solution is to employ the vector-based calculating method, which possesses the merits of simplicity and efficiency, to gain the interface velocity vector through legitimately assuming a direction of the interface velocity. A miniaturized four-sensor electrical probe was made and a gas–liquid two-phase flow experiment was performed to test the proposed signal process scheme. The two-phase flow was controlled to be in cap-bubble flow regime. To validate the availability and reliability of the proposed method, the local flow parameters obtained by the probe measurement were compared with the results from visual measurement technique in the same flow conditions. The comparison indicates that the above local flow parameters from four-sensor probe measurement are in good agreement with the visual measurement results, with maximum deviations of chord length of 8.7%, thereby proving the correctness of the proposed method.

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Liquid distribution and hold-up measurement in counter current flow packed column by electrical capacitance tomography

Cited by 27 publications

References 36 publications

Flow regime transition in countercurrent packed column monitored by ECT

Flow regime transition in countercurrent packed column monitored by ECT

Joint Method for the Experimental and Computational Characterization of Ammonia Absorption Columns

A New Vector-Based Signal Processing Method of Four-Sensor Probe for Measuring Local Gas–Liquid Two-Phase Flow Parameters Together with Its Assessment against One Bubbly Flow

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