Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Entrance effects and high shear rate rheology of shear banding wormlike micelle fluids in a microcapillary flow

Published

Author(s)

Paul Salipante, Vishnu Dharmaraj, Steven D. Hudson

Abstract

The viscosity of a shear-banding wormlike micelle solution at high shear rates is investigated using capillary rheology and particle streak velocimetry. Measurements of the flow profile and pressure gradient show an extended entrance region, which exceeds a length to diameter ratio of 100, to reach a fully developed flow. We characterized this entrance region for capillaries with different cross-sections and use the results to select a downstream portion of the capillary where viscosity measurements can be made on fully developed flow. Measurements from this portion of the channel show a shear-thinning power-law behavior for all channel geometries from shear rates of 1000 s^-1 to 120000 s^-1. Varying the surfactant concentration shows two distinct power-law behaviors that depend on both shear rate and concentration and are an indication of change in micelle length.
Citation
Journal of Rheology
Volume
64
Issue
3

Citation

Salipante, P. , Dharmaraj, V. and Hudson, S. (2020), Entrance effects and high shear rate rheology of shear banding wormlike micelle fluids in a microcapillary flow, Journal of Rheology, [online], https://doi.org/10.1122/1.5128230 (Accessed May 23, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created March 9, 2020, Updated April 14, 2020