Title | Microfluidic Extensional Rheometry using a Hyperbolic Contraction Geometry |

Publication Type | Journal Article |

Year of Publication | 2013 |

Authors | Ober T.J, Haward S.J, Pipe C.J, Soulages J., McKinley G.H |

Journal | Rheologica Acta |

Volume | 52 |

Issue | 6 |

Pagination | 529-546 |

Abstract | Microfluidic devices are ideally suited for the study of complex fluids undergoing large deformation rates in the absence of inertial complications. In particular, a microfluidic contraction geometry can be utilized to characterize the material response of complex fluids in an extensionally-dominated flow, but the mixed nature of the flow kinematics makes quantitative measurements of material functions such as the true extensional viscosity challenging. In this paper, we introduce the ‘extensional viscometer-rheometer-on-a-chip’ (EVROC), which is a hyperbolically-shaped contraction-expansion geometry fabricated using microfluidic technology for characterizing the importance of viscoelastic effects in an extensionally-dominated flow at large extension rates (λε˙ |

DOI | 10.1007/s00397-013-0701-y |