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Issue 2, 2014
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Serpentine channels: micro-rheometers for fluid relaxation times

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Abstract

We propose a novel device capable of measuring relaxation times of viscoelastic fluids as small as 1 ms. In contrast to most rheometers, which by their very nature are concerned with producing viscometric or nearly-viscometric flows, here we make use of an elastic instability that occurs in the flow of viscoelastic fluids with curved streamlines. To calibrate the rheometer we combine simple scaling arguments with relaxation times obtained from first normal-stress difference data measured in a classical shear rheometer. As an additional check we also compare these relaxation times to those obtained from Zimm theory and good agreement is observed. Once calibrated, we show how the serpentine rheometer can be used to access smaller polymer concentrations and lower solvent viscosities where classical measurements become difficult or impossible to use due to inertial and/or resolution limitations. In the absence of calibration, the serpentine channel can still be a very useful comparative or index device.

Graphical abstract: Serpentine channels: micro-rheometers for fluid relaxation times

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Article information


Submitted
08 Jul 2013
Accepted
30 Sep 2013
First published
30 Sep 2013

This article is Open Access

Lab Chip, 2014,14, 351-358
Article type
Paper

Serpentine channels: micro-rheometers for fluid relaxation times

J. Zilz, C. Schäfer, C. Wagner, R. J. Poole, M. A. Alves and A. Lindner, Lab Chip, 2014, 14, 351
DOI: 10.1039/C3LC50809A

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