2019
DOI: 10.1063/1.5092634
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Steady streaming viscometry of Newtonian liquids in microfluidic devices

Abstract: We report a novel technique capable of measuring the kinematic shear viscosity of Newtonian liquids with steady streaming in microfluidic devices. This probe-free microrheological method utilizes sub-kilohertz liquid oscillation frequencies around a cylindrical obstacle, ensuring that the inner streaming layer is comparable in size to the cylinder radius. To calibrate the viscometer, the evolution of the inner streaming layer as a function of oscillation frequency for a liquid of known viscosity is characteriz… Show more

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Cited by 15 publications
(10 citation statements)
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References 38 publications
(42 reference statements)
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“…The main difference, compared with DI water, is the eddy center distance from the cylinder surface, which is larger for PAA 4000. This larger eddy center distance indicates a higher viscosity for PAA 4000, as was recently demonstrated [26], and is in agreement with steady state shear viscosity measurements shown in Figure 1(a).…”
Section: Resultssupporting
confidence: 92%
See 1 more Smart Citation
“…The main difference, compared with DI water, is the eddy center distance from the cylinder surface, which is larger for PAA 4000. This larger eddy center distance indicates a higher viscosity for PAA 4000, as was recently demonstrated [26], and is in agreement with steady state shear viscosity measurements shown in Figure 1(a).…”
Section: Resultssupporting
confidence: 92%
“…The effectiveness of steady streaming as a microrheological tool has been reconsidered recently and demonstrated for lowviscosity Newtonian liquids in microfluidic devices [26]. In this work, we experimentally investigate steady streaming of non-Newtonian liquids in microfluidic devices.…”
Section: Introductionmentioning
confidence: 99%
“…The results shown in this study can be envisioned in a larger scope, including in applications of mixing and homogenization of fluids, which requires the generation of flow at a large distance from the source. Very recent studies focused on situations of a more complex geometry [39], microfluidics [22,23,46] or nonlinear interactions between streaming and acoustic waves in acoustic streaming [47]. Depending on the size ratio between the mechanical actuator (or the acoustic wavelength) and the vessel, operating in conditions of high-Reynolds number flows can generate a flow whose spatial extension can be as large as the vessel or channel size.…”
Section: Resultsmentioning
confidence: 99%
“…The first category of flows are those where oscillatory motion enables instantaneous local velocities or shear rates without net displacement, which is usually implemented to reduce device footprint and allow for prolonged observation [7,15,32,33]. The second category of flows are those that utilize steady rectified flows associated with an underlying primary high frequency oscillatory flow [34], which have been shown to be useful in mixing [2], hydrodynamic manipulation of particles and cells [4,18,35], and more recently, in microrheology [11,12]. Here, we demonstrate two specific applications of the oscillatory driver from each category, namely, inertial focusing from the former and mixing from the latter, using simple prototypical microfluidic configurations.…”
Section: Applications Of Oscillatory Flow In Microchannelsmentioning
confidence: 99%
“…Oscillatory flows in microfluidic devices have been shown to be useful in a range of applications such as mixing at low Reynolds numbers [1][2][3], particle sorting and focusing [4][5][6][7], enhancement of heat transfer [8], flow control [9,10], microrheology [11,12], and chemical extraction [13,14]. Nevertherless, the widespread use and study of oscillatory flows in microchannels remains uncommon due to challenges of implementation.…”
Section: Introductionmentioning
confidence: 99%