Analysis of impedance data from bubble flow in a glass/SU8 microfluidic device with on-channel sensors

Talebi, Mohammadmahdi; Woias, Peter; Cobry, Keith

doi:10.1016/j.sna.2018.07.004

Cited by 5 publications

(8 citation statements)

References 25 publications

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“…In the field of multiphase flow sensing, researchers have implemented electrical sensing elements using different methods such as parallel plate resistive/capacitive/impedimetric techniques, which often are based on wire mesh or two wire systems. There are examples in the literature on both the macro [21,22,23] and micro scales [24,25,26,27] that show how different fields of application, such as the oil and gas industry, fine chemicals production or even bioanalytics can benefit from integrated sensing systems for two phase flows. The common point in all of these studies is that the main objective is to detect local void fraction and flow regime patterns [28,24,29,22].…”

Section: Electrical Sensing For Two-phase Flowmentioning

confidence: 99%

“…In microchannels, as opposed to macrochannels, electrical sensing elements in tests with two phase flows are typically configured with parallel plate or interdigitated electrodes on either one or opposing channel walls [24,26,27,35,36]. In the work presented by Paranjape et al and Valiorgue et al, two flush-mounted electrodes were used to perform electrical sensing on adiabatic two phase flow at room temperature 760 × 760 µm microchannel [24,29].…”

Section: Page 4 Of 24 Author Submitted Manuscript -Mst-109028r1mentioning

confidence: 99%

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Investigation of water microchannel boiling flow regimes using electrical sensing elements along a single microchannel

Talebi¹,

Sadir²,

Cobry³

et al. 2019

Meas. Sci. Technol.

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In this work, we present a method that allows for the detection of the local flow regime in a metallic microchannel using on-channel electrical sensing elements. The development of the flow regime is analyzed along a straight channel (length: 63.5 mm, width: 1.5 mm, height: 0.5 mm) using 4 transparent electrodes fabricated on a glass lid. A constant heat flux boundary condition at the channel walls is applied to deionized water flow. Measurements are validated by recorded videos at the same locations as the sensing elements. The topology of the probability densities of impedimetric measurements shows a clear connection with visually observed flow regimes, including bubbly, slug, wavy/churn and annular flow. The method and test facilities show promising potential for further investigations into how variable channel geometries and local process parameters influence microchannel boiling.

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Section: Electrical Sensing For Two-phase Flowmentioning

confidence: 99%

Section: Page 4 Of 24 Author Submitted Manuscript -Mst-109028r1mentioning

confidence: 99%

Investigation of water microchannel boiling flow regimes using electrical sensing elements along a single microchannel

Talebi¹,

Sadir²,

Cobry³

et al. 2019

Meas. Sci. Technol.

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“…1 Since epoxy groups are crosslinked by being exposed to ultraviolet (UV) light (typically 365–405 nm) and form a stable solid structure, the polymer belongs to the family of negative photoresists. 2,3 After revealing numerous advantages of SU8, it became a technological platform across many disciplines, including microfluidics, 4–7 micromechanics, 8 biomedicine, 9 optoelectronics, 10,11 and many others. 12–15…”

Section: Introductionmentioning

confidence: 99%

Thin-film conformal fluorescent SU8-phenylenediamine

Barhum,

Kolchanov,

Attrash

et al. 2023

Nanoscale

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“…Most of the existing CCD-based sensors only focus on the real part of the fluid impedance, and do not take full advantage of the total fluid impedance information of the gas-liquid two-phase flow, especially the imaginary part. It is proved that the fluid impedance information (both the real part and imaginary part) can reflect the characteristics of gas-liquid two-phase flow from different perspectives [1], [2], [26]- [31]. However, research work concerning the utilization of the fluid impedance is limited [26]- [31].…”

Section: Introductionmentioning

confidence: 99%

“…It is proved that the fluid impedance information (both the real part and imaginary part) can reflect the characteristics of gas-liquid two-phase flow from different perspectives [1], [2], [26]- [31]. However, research work concerning the utilization of the fluid impedance is limited [26]- [31]. In terms of the above two aspects, to implement velocity measurement of small-scale gas-liquid two-phase flow, the conventional CCD technique needs to be extended and new velocity measurement sensor needs to be developed as follows: 1) A more flexible approach should be proposed to overcome the adverse influence of 1 and 2 .…”

Section: Introductionmentioning

confidence: 99%

New Contactless Velocity Measurement Sensor for Bubble/Slug Flow in Small Scale Pipes

Guo

Huang

et al. 2020

IEEE Access

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A new contactless velocity measurement sensor for bubble/slug flow in small scale pipes is developed with the contactless impedance detection (CID) technique. The new sensor consists of two samedesigned CID modules (an upstream and a downstream) and an information processing module. In the upstream/downstream CID module, the capacitive reactance elimination principle is introduced to eliminate the adverse influence of coupling capacitances, and the analog phase sensitive demodulation (APSD) technique is adopted to obtain the fluid impedance signals (real part and imaginary part) of the gas-liquid two-phase flow. In the information processing module, the cross-correlation method is introduced to determine two initial bubble/slug velocities with real part and imaginary part of the fluid impedance, respectively. Then for each flow pattern, a velocity fusion model is established to fuse the two initial velocities. Based on the flow pattern identification result by a flow pattern classifier, the corresponding velocity fusion model is applied to determine the fused bubble/slug velocity. Three prototypes of the new sensor are developed and experiments are carried out. Experimental results show that the new sensor has good velocity measurement performance for bubble/slug flow in small scale pipes. For all the three prototypes, the maximum relative errors of velocity measurement are less than 3.0%. Results also indicate that the capacitive reactance elimination can successfully overcome the adverse influence of the coupling capacitances and taking full advantage of the total fluid impedance signals is an effective way to improve the velocity measurement accuracy.INDEX TERMS Gas-liquid two-phase flow, velocity measurement, capacitive reactance elimination, contactless impedance detection (CID), cross-correlation method, small scale pipes.

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Analysis of impedance data from bubble flow in a glass/SU8 microfluidic device with on-channel sensors

Cited by 5 publications

References 25 publications

Investigation of water microchannel boiling flow regimes using electrical sensing elements along a single microchannel

Investigation of water microchannel boiling flow regimes using electrical sensing elements along a single microchannel

Thin-film conformal fluorescent SU8-phenylenediamine

New Contactless Velocity Measurement Sensor for Bubble/Slug Flow in Small Scale Pipes

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