Steady streaming flows in viscoelastic liquids

Vishwanathan, Giridar; Juárez, Gabriel

doi:10.1016/j.jnnfm.2019.07.007

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…Viscous streaming refers to the time-averaged steady flow that arises when an immersed body of characteristic length scale D undergoes small-amplitude oscillations (compared to D) in a viscous fluid. Viscous streaming has been well explored and characterized theoretically, experimentally and computationally, for constant curvature shapes which include oscillating individual circular cylinders (Holtsmark et al 1954;Riley 2001;Lutz, Chen & Schwartz 2005;Coenen 2013;Vishwanathan & Juarez 2019), infinite flat plates (Glauert 1956;Yoshizawa 1974) and spheres (Lane 1955;Riley 1966;Kotas, Yoda & Rogers 2007). However, little is known beyond these simple objects, in particular when multiple curvatures in complex shapes are involved.…”

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confidence: 99%

Shape curvature effects in viscous streaming

2020

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confidence: 99%

Shape curvature effects in viscous streaming

2020

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“…The characterization of viscoelastic fluids under non-steady pressure forcing is also important for lab-on-a-chip clinical analysis of biofluids such as blood, mucus, or synovial fluid. The dynamics of polymeric viscoelastic solutions under pulsatile forcing in microchannels is an area of recent development [18]. Flow of these solutions is strongly influenced by chemical properties of the polymer, its molecular weight and ramifications, concentration, the nature of the solvent, temperature and pressure [19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Resonances in Viscoelastic Microfluidics

et al. 2021

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Pulsatile flows of viscoelastic fluids are very important for lab-on-a-chip devices, because most biofluids have viscoelastic character and respond distinctively to different periodic forcing. They are also very important for organ-on-a-chip devices, where the natural mechanical conditions of cells are emulated. The resonance frequency of a fluid refers to a particular pulsatile periodicity of the pressure gradient that maximizes the amplitude of flow velocity. For viscoelastic fluids, this one has been measured experimentally only at macroscales, since fine tuning of rheological properties and system size is needed to observe it at microscales. We study the dynamics of a pulsatile (zero-mean flow) fluid slug formed by a viscoelastic fluid bounded by two air-fluid interfaces, in a microchannel of polymethyl methacrylate. We drive the fluid slug by a single-mode periodic pressure drop, imposed by a piezoactuator. We use three biocompatible polymer solutions of polyethylene oxide as model viscoelastic fluids, and find resonances. We propose a model accounting for surface tension and fluid viscoelasticity that has an excellent agreement with our experimental findings. It also provides an alternative way of measuring relaxation times. We validate the method with parameters reported in the literature for two of the solutions, and estimate the relaxation time for the third one.

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“…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

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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 flows in viscoelastic liquids

Cited by 14 publications

References 36 publications

Shape curvature effects in viscous streaming

Shape curvature effects in viscous streaming

Experimental Resonances in Viscoelastic Microfluidics

Generation and application of sub-kilohertz oscillatory flows in microchannels

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