Steady streaming viscometry of Newtonian liquids in microfluidic devices

Vishwanathan, Giridar; Juárez, Gabriel

doi:10.1063/1.5092634

Cited by 13 publications

(10 citation statements)

References 38 publications

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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%

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Steady streaming flows in viscoelastic liquids

Vishwanathan

Juárez

2019

Journal of Non-Newtonian Fluid Mechanics

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We discuss experimental investigations on steady streaming flows of dilute and semi-dilute polymer solutions in microfluidic devices. The effect of non-Newtonian behavior on steady streaming for different model fluids is determined by characterizing the evolution of the inner streaming layer as a function of oscillation frequency using particle tracking velocimetry. We find that steady streaming velocity profiles in constant-viscosity elastic liquids are qualitatively similar to those in Newtonian liquids. Steady streaming velocity profiles in elastic liquids with strong shear thinning, however, display two unique features: (i) a non-monotonic evolution of the inner streaming layer with increasing frequency, first growing then decreasing in width, and (ii) a clear asymmetry in the flow profile at high frequencies.

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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%

Steady streaming flows in viscoelastic liquids

Vishwanathan

Juárez

2019

Journal of Non-Newtonian Fluid Mechanics

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“…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%

Vortex elongation in outer streaming flows

et al. 2020

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We study the secondary time-averaged flow (streaming) generated by an oscillating cylinder immersed within a fluid, under high amplitude forcing so that inertial effects are significant. This streaming is decomposed into a viscous boundary layer flow where vorticity is created, and an outer flow of larger size. We operate under conditions of relatively low viscosity, so that the boundary layer is smaller than the object diameter. While for low Keulegan-Carpenter (KC) number (small enough amplitude), the size of the outer flow is typically that of the object, here we show that at large enough forcing, the outer flow stretches along the direction of the vibration by up to 8 times, while the flow still keeps its axial symmetry. We quantify the elongation through PIV measurements under an unprecedented range of frequency and amplitude, so that the streaming Reynolds number reaches values much larger than unity. The absence of significant unsteady component of vorticity outside the viscous boundary layer -and the fact that the length of elongation scales well with the streaming Reynolds number -suggest that the stretching should be due to the convection of stationary vorticity by the streaming flow itself.

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“…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%

Generation and application of sub-kilohertz oscillatory flows in microchannels

Vishwanathan,

Juarez

2019

Preprint

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We present a user-friendly and versatile experimental technique that generates sub-kilohertz sinusoidal oscillatory flows within microchannels. The method involves the direct interfacing of microfluidic tubing with a loudspeaker diaphragm to generate oscillatory flow in microchannels with frequencies ranging from 10−1000 Hz and amplitudes ranging from 10−600 µm. The speaker-based apparatus allows independent control of frequency and amplitude that is unique to the speaker's manufacturing specifications. The performance of our technique is evaluated by Fourier spectral analysis of oscillatory motion of tracer particles, obtained by particle tracking velocimetry, as well as by comparing oscillatory flow profiles against theoretical benchmarks such as Stokes flow in a square channel and Stokes' second problem near a solid boundary. Applications that utilize both the oscillatory flow and the associated steady rectified flows are demonstrated in prototypical microfluidic configurations. These include inertial focusing and mixing at low Reynolds numbers, respectively.

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Steady streaming viscometry of Newtonian liquids in microfluidic devices

Cited by 13 publications

References 38 publications

Steady streaming flows in viscoelastic liquids

Steady streaming flows in viscoelastic liquids

Vortex elongation in outer streaming flows

Generation and application of sub-kilohertz oscillatory flows in microchannels

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