The measurement of local flow parameters for gas–liquid two-phase bubbly flows using a dual-sensor probe array

Zhai, Lusheng; Bian, Peng; Gao, Zhong-Ke; Jin, Ningde

doi:10.1016/j.ces.2016.01.058

Cited by 42 publications

(7 citation statements)

References 53 publications

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“…The flow state was laminar flow when Re ≤ Re c and was turbulent flow when Re ≥ Re c . In the present study, for the calculated Reynolds number was Re = 17.49, which was far less than Re c , thus the corresponding flow state was viscous laminar flow [ 19 ].…”

Section: Description Of the Model Equationsmentioning

confidence: 93%

Development of a Novel Micro Photoionization Detector for Rapid Volatile Organic Compounds Measurement

Zhou

Zhang

et al. 2018

Applied Bionics and Biomechanics

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The simulation of the gas flow field and electrostatic field in the photoionization detector by COMSOL was conducted based on principle investigation in the present study. Under the guidance of simulation results, structural optimization was carried out to significantly reduce the dead volume of the ionization chamber, and finally, the relationship between offset voltage and collection efficiency was obtained which led to a remarkable increase in the collection efficiency of charged ions in the photoionization detector. Then an ionization chamber with low interference and fast response was developed. Then experiment was performed with toluene as a VOCs gas under the condition of optimal gas flow rate of 50 ml, UV lamp ionization energy of 10.86 eV. The results showed that the ion collection efficiency reached 91% at a bias voltage of 150 V. Moreover, a preferred linearity of 99.99% was obtained, and a ppb level of LOD can be achieved. The determination results well-fitted the relationship between offset voltage and the response value obtained in the simulation.

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Section: Description Of the Model Equationsmentioning

confidence: 93%

Development of a Novel Micro Photoionization Detector for Rapid Volatile Organic Compounds Measurement

Zhou

Zhang

et al. 2018

Applied Bionics and Biomechanics

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“…By contrast, the probe produces a high level when its tips are in water phase. For the measurement principle of the dual-sensor conductance probe, the reader can refer to Zhai et al [ 21 , 22 ]. A transverse mechanism is designed to control the position of the probe tips along the vertical direction of the pipe.…”

Section: Experiments With Oil–water Two-phase Flowmentioning

confidence: 99%

“…The ratio of the water phase duration to the acquisition time can be defined as the local water holdup at the probe location [ 21 ]. The local velocity is calculated by the distance and the transit time calculated by the cross-correlation function [ 22 ]. Figure 12 shows the measurement profiles of the local velocity and local water holdup of DC flows.…”

Section: Experiments With Oil–water Two-phase Flowmentioning

confidence: 99%

Capacitive Phase Shift Detection for Measuring Water Holdup in Horizontal Oil–Water Two-Phase Flow

Zhai

Yao

Wang

et al. 2018

Sensors

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In this paper, a phase shift detection system of flow impedance is designed based on a concave capacitance sensor (CCS). The flow impedance of oil–water stratified flow is investigated by establishing an equivalent circuit model and a finite element model. The influence of exciting frequency and sensor geometric parameters on the phase shift output of the CCS is studied to access an optimal phase shift measurement system. An experiment of horizontal oil–water two-phase flows was conducted during which four flow patterns are observed, i.e., stratified flow (ST), stratified wavy flow (SW), dual continuous flow (DC), and dispersed oil-in-water and water flow (DO/W&W). The phase shift responses of the CCS to the water holdup variation are collected. The results indicate that the phase shift response of the CCS presents satisfied sensitivity for ST and SW flow patterns, which is consistent with the predictions of the equivalent circuit model and the finite element model. Although the flow structures of DC and DO/W&W flows are extremely nonuniform, the phase shift response of the CCS still shows better linearity and sensitivity to the water holdup variation. In general, the capacitive phase shift detection technology exhibits advantages for water holdup measurement in horizontal oil–water two-phase flow with nonuniform phase distributions and conductive water.

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“…Therefore, the two-phase flow parameters are difficult to measure quickly and accurately [7]. However, the knowledge of local parameters of two-phase flow plays a critical role in the studies of the heat and mass transfer characteristics and mechanism of the gas-liquid two-phase, the development of two-phase modeling research, the optimization of two-phase flow patterns and the safety and stability of equipment operation [8][9][10]. The theoretical models, including the two-fluid model and interfacial area transportation model, rely heavily on the advanced measurement techniques to provide benchmark database and possibility of inspecting new phenomenon and physical laws.…”

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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The measurement of local flow parameters for gas–liquid two-phase bubbly flows using a dual-sensor probe array

Cited by 42 publications

References 53 publications

Development of a Novel Micro Photoionization Detector for Rapid Volatile Organic Compounds Measurement

Development of a Novel Micro Photoionization Detector for Rapid Volatile Organic Compounds Measurement

Capacitive Phase Shift Detection for Measuring Water Holdup in Horizontal Oil–Water Two-Phase Flow

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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