Microchannel measurements of viscosity for both gases and liquids

Shiba, Kota; Li, Guangming; Virot, Emmanuel; Yoshikawa, Genki; Weitz, David A.

doi:10.1039/d1lc00202c

Cited by 12 publications

(8 citation statements)

References 29 publications

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“…Detailed analysis of gases and their discrimination will be also possible, even with a compact setup, by coupling the present device with another one that enables us to determine density or viscosity. [ 23 ]…”

Section: Resultsmentioning

confidence: 99%

Visualization of Flow‐Induced Strain Using Structural Color in Channel‐Free Polydimethylsiloxane Devices

et al. 2022

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Measuring flow of gases is of fundamental importance yet is typically done with complex equipment. There is, therefore, a longstanding need for a simple and inexpensive means of flow measurement. Here, gas flow is measured using an extremely simple device that consists of an Ar plasma-treated polydimethylsiloxane (PDMS) slab adhered on a glass substrate with a tight seal. This device does not even have a channel, instead, gas can flow between the PDMS and the glass by deforming the PDMS wall, in other words, by making an interstice as a temporary path for the flow. The formation of the temporary path results in a compressive bending stress at the inner wall of the path, which leads to the formation of well-ordered wrinkles, and hence, the emergence of structural color that changes the optical transmittance of the device. Although it is very simple, this setup works sufficiently well to measure arbitrary gases and analyzes their flow rates, densities, and viscosities based on the change in color. It is also demonstrated that this technique is applicable to the flow-induced display of a pattern such as a logo for advanced applications.

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Section: Resultsmentioning

confidence: 99%

Visualization of Flow‐Induced Strain Using Structural Color in Channel‐Free Polydimethylsiloxane Devices

et al. 2022

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“…Mechanical sensors detect mechanical deformation and translate it into an interpretable signal. Shiba et al developed a simple microfluidic device for mechanical measurement of fluid viscosity . It features a deformable microchannel where the extent of deformation indicates resistance to flow, which is related to the fluid viscosity.…”

Section: Sensor and Detection Technologymentioning

confidence: 99%

“…Shiba et al developed a simple microfluidic device for mechanical measurement of fluid viscosity. 90 It features a deformable microchannel where the extent of deformation indicates resistance to flow, which is related to the fluid viscosity. A strain gauge was embedded near the deformable microchannel to transduce the deformation into strain.…”

Section: ■ Sensor and Detection Technologymentioning

confidence: 99%

Advances in Microfluidics: Technical Innovations and Applications in Diagnostics and Therapeutics

Aubry

Lee

2023

Anal. Chem.

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“…Previous studies have focused on the steady, inertialess flow regime. In this regime, by leveraging the FSIs, a myriad of applications to microfluidics have been proposed, such as: pressure sensors (Hosokawa et al, 2002;Ozsun et al, 2013), strain sensors (Dhong et al, 2018), micro-rheometers with increased sensitivity (Shiba et al, 2021), and passive technique for profiling microchannels' shape (Karan et al, 2021). More recently, microfluidic systems have also begun to access inertial flow regimes up to a Reynolds number Re 10 2 (Di Carlo et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Reduced modeling and global instability of finite-Reynolds-number flow in compliant rectangular channels

Wang¹,

Christov²

2022

Preprint

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Experiments have shown that flow in compliant microchannels can become unstable at a much lower Reynolds number than the corresponding flow in a rigid conduit. Therefore, it has been suggested that the wall's elastic compliance can be exploited towards new modalities of microscale mixing. While previous studies mainly focused on the local instability induced by the fluid-structure interactions (FSIs) in the system, we derive a new one-dimensional (1D) model to study the FSI's effect on the global instability. The proposed 1D FSI model is tailored to long, shallow rectangular microchannels with a deformable top wall, similar to the experiments. Going beyond the usual lubrication flows analyzed in these geometries, we include finite fluid inertia and couple the reduced flow equations to a reduced 1D wall deformation equation. Although a quantitative comparison to previous experiments is quite difficult, the behaviors of the proposed derived model show qualitatively agreement with the experimental observations, and capture several key effects. Specifically, we find the critical conditions under which the inflated base state of the 1D FSI model is linearly unstable to infinitesimal perturbations. The critical Reynolds numbers predicted are in agreement with experimental observations. The unstable modes are highly oscillatory, with frequencies close to the natural frequency of the wall, suggesting that the observed instabilities are resonance phenomena. Furthermore, during the start-up from an undeformed initial state, self-sustained oscillations can be triggered due to FSIs. Our proposed modeling framework can be applied to other microfluidic systems with similar geometric scale separation, even under different operation conditions.

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Microchannel measurements of viscosity for both gases and liquids

Abstract: We introduce a facile, microfluidic approach to mechanically measuring the viscosity of a fluid with high precision over a wide range, even extending from gases to liquids.

Cited by 12 publications

References 29 publications

Visualization of Flow‐Induced Strain Using Structural Color in Channel‐Free Polydimethylsiloxane Devices

Visualization of Flow‐Induced Strain Using Structural Color in Channel‐Free Polydimethylsiloxane Devices

Advances in Microfluidics: Technical Innovations and Applications in Diagnostics and Therapeutics

Reduced modeling and global instability of finite-Reynolds-number flow in compliant rectangular channels

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