Stream spreading in multilayer microfluidic flows of suspensions

Mona Utne Larsen, Nina C. Shapley

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The goal of this experimental study is to quantify the spreading of parallel streams with viscosity contrast in multilayer microfluidic flows. Three streams converge into one channel where a test fluid is sheathed between two layers of a Newtonian reference fluid. The test fluids are Newtonian fluids with viscosities ranging from 1.1 to 48.2 cP and suspensions of 10-μm-diameter PMMA particles with particle volume fractions φ = 0.16-0.30. The fluid interface locations are identified through fluorescence microscopy. The steady-state width of the center stream is strongly dependent on the viscosity ratio between the adjacent fluids and exhibits a near power-law relationship. This dependence occurs for both the Newtonian fluids and the suspensions, although the slopes differ. The high-concentration suspension (φ = 0.30) diverges from Newtonian behavior, while the low-concentration suspensions (φ = 0.16, 0.22) closely approximate that of the Newtonian fluids. The observed suspension behavior can be attributed to shear-induced particle migration.

Original languageEnglish (US)
Pages (from-to)1947-1953
Number of pages7
JournalAnalytical Chemistry
Volume79
Issue number5
DOIs
StatePublished - Mar 5 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Stream spreading in multilayer microfluidic flows of suspensions'. Together they form a unique fingerprint.

Cite this