Capacitive determination of wall-film thickness in liquid-liquid slug flow and its application as a non-invasive microfluidic viscosity sensor

Arsenjuk, Linda; Wiesehahn, Maximilian; Zimmermann, Elodia Morales; Katschan, Witalij; Agar, David W.

doi:10.1016/j.sna.2020.112342

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…Many designs have already been introduced as viscosity sensors, indicating high importance of viscosity measurement . In previous designs, various methods have been used to measure viscosity, which can be referred to as electrostatic [13], electromagnetic [14], acoustic [15] and thermal [16]. The proposed structures are mainly based on cantilever resonators [17,18].…”

Section: Introductionmentioning

confidence: 99%

Fabricated electromechanical resonator sensor for liquid viscosity measurement

Eidi

2023

Metrology and Measurement Systems

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The properties of a mechanical resonator provide a valuable ability to measure liquid density and viscosity. The viscosity of liquids is of interest to researchers in both industry and medicine. In this paper, a viscosity sensor for liquids is proposed, which is designed based on an electromechanical resonator. In the proposed sensor, a capacitor is used as an electrostatic actuator. The capacitor is also used to monitor the frequency changes of the proposed resonator. The range of displacement of the resonator and capacitor in response to different fluids under test varies according to their viscosity. The design of the proposed sensor and its electrostatic and mechanical simulations are reported in this paper. Also, the effect of viscosity of several different liquids on its performance has been analyzed and presented experimentally using a prototype.

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Section: Introductionmentioning

confidence: 99%

Fabricated electromechanical resonator sensor for liquid viscosity measurement

Eidi

2023

Metrology and Measurement Systems

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“…Conductivity sensors, such as the commercially available capacitively coupled contactless conductivity detection (C 4 D) sensor, employ a contactless measurement of the medium conductivity in a capillary with two external electrodes [20][21][22][23]. This measurement method is particularly elegant, since it can also be utilized for nontransparent capillaries and is well suited for two-phase systems [22,23]. A disadvantage, however, is that at least one of the phases (usually an aqueous phase) must have good conductivity [20,22].…”

Section: Introductionmentioning

confidence: 99%

Photoelectric Sensor for Fast and Low-Priced Determination of Bi- and Triphasic Segmented Slug Flow Parameters

Vietinghoff

Lungrin

Schulzke

et al. 2020

Sensors

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Applying multiphase systems in microreactors leads to an intensification of heat and mass transport. Critical aspects of the well-studied segmented slug-flow, such as bubble generation and pump control, can be automated, provided a robust sensor for the reliable determination of velocity, phase lengths, and phase ratio(s) is available. In this work, a fast and low-priced sensor is presented, based on two optical transmission sensors detecting flow characteristics noninvasively together with a microcontroller. The resulting signal is mainly due to refraction of the bubble-specific geometries as shown by a simulation of light paths. The high performance of the processing procedure, utilizing the derivative of the signal, is demonstrated for a bi- and triphasic slug flow. The error of <5% is entirely reasonable for the purpose envisaged. The sensor presented is very fast, robust, and inexpensive, thus enhancing the attractiveness of parallelized capillary reactors for industrial applications.

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Contactless Conductivity Detection for Capillary Electrophoresis—Developments From 2020 to 2024

Hauser,

Kubáň

2024

Electrophoresis

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The review covering the development of capillary electrophoresis with capacitively coupled contactless conductivity detection from 2020 to 2024 is the latest in a series going back to 2004. The article considers applications employing conventional capillaries and planar lab‐on‐chip devices as well as fundamental and technical developments of the detector and complete electrophoresis instrumentation.

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Capacitive determination of wall-film thickness in liquid-liquid slug flow and its application as a non-invasive microfluidic viscosity sensor

Cited by 7 publications

References 47 publications

Fabricated electromechanical resonator sensor for liquid viscosity measurement

Fabricated electromechanical resonator sensor for liquid viscosity measurement

Photoelectric Sensor for Fast and Low-Priced Determination of Bi- and Triphasic Segmented Slug Flow Parameters

Contactless Conductivity Detection for Capillary Electrophoresis—Developments From 2020 to 2024

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