Journal ArticleDOI
Deviation of Velocity Gradient Profiles from the “Gap Loading” and “Surface Loading” Limits in Dynamic Simple Shear Experiments
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TLDR
In this paper, the shear wave field generated in a linear viscoelastic medium confined between parallel plates (one fixed, the other oscillating sinusoidally in its own plane) has been evaluated and presented in a graphical form convenient for determination of the role of wave propagation effects in dynamic rheological measurements.Abstract:
The shear‐wave field generated in a linear viscoelastic medium confined between parallel plates (one fixed, the other oscillating sinusoidally in its own plane) has been evaluated and presented in a graphical form convenient for determination of the role of wave propagation effects in dynamic rheological measurements. The transition from closely spaced planes (“gap loading”) to the freely propagating plane wave (“surface loading”) limit is examined; the importance of deviations in magnitude and phase of the gradient profile from the gap loading limit is discussed in terms of high precision dynamic rheological experiments; significant deviations occur for shear wavelength to gap width ratios of 30 or less.read more
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Book ChapterDOI
Experimental Challenges of Shear Rheology: How to Avoid Bad Data
TL;DR: In this paper, the authors discuss the common challenges in measuring shear material functions in the context of soft, water-based, and even living biological complex fluids, and discuss techniques for identifying and minimizing experimental errors and for pushing the experimental limits of rotational shear rheometers.
Book ChapterDOI
Large-Amplitude Oscillatory Shear
TL;DR: Although linear viscoelastic properties can be measured in many ways, the small-amplitude oscillatory shear test is the most widely used method as mentioned in this paper, but no predominant test method has emerged amongst experimentalists.
Journal ArticleDOI
Thixotropy : Build-up and breakdown curves during flow
Konraad Dullaert,Jan Mewis +1 more
TL;DR: In this article, the effect of flow history on the characteristic times and on the shape of the transient curves of thixotropic structures is investigated. But the authors do not consider the effects of shear history effects on the structure.
Journal ArticleDOI
Elastic flow instability, curved streamlines, and mixing in microfluidic flows
TL;DR: In this paper, the authors used flow visualization to study the mechanism underlying a purely elastic flow instability for Poiseuille flow in a micro (μ)channel having a zigzag path (curved streamlines) and quantitatively investigate its implications for fluid mixing.
Journal ArticleDOI
Linear viscoelastic moduli of concentrated DNA solutions
TL;DR: In this article, the frequency-dependent linear viscoelastic storage and loss moduli were measured for calf thymus DNA (13 kbp) in a saline buffer over a range of mitotically relevant mass concentrations from C = 1 to 10 mg/mL.