### Abstract

Important flow enhancement effects take place when the motion of a non‐Newtonian fluid is driven either by pressure gradients pulsating around a non‐zero mean or by longitudinal and transversal boundary waves superposed on Poiseuille flow. Flow enhancement in the latter case is an order of magnitude larger than in the former. A regular perturbation in terms of the amplitude of the oscillation is used and closed form formulas given for mass transport rates at the lowest significant order. In particular it is shown that a mean flow may be generated even when the pressure gradients oscillate around a zero mean or the boundary waves are superposed on a fluid at rest if the frequencies of two superposed waves are in certain ratios.

Original language | English |
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Pages (from-to) | 73-90 |

Number of pages | 18 |

Journal | Makromolekulare Chemie. Macromolecular Symposia |

Volume | 23 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 1 1989 |

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### All Science Journal Classification (ASJC) codes

- Organic Chemistry
- Materials Chemistry
- Polymers and Plastics
- Condensed Matter Physics

### Cite this

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**On the superposition of oscillatory and shear flows of viscoelastic liquids.** / Siginer, D. A.

Research output: Contribution to journal › Article

TY - JOUR

T1 - On the superposition of oscillatory and shear flows of viscoelastic liquids

AU - Siginer, D. A.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Important flow enhancement effects take place when the motion of a non‐Newtonian fluid is driven either by pressure gradients pulsating around a non‐zero mean or by longitudinal and transversal boundary waves superposed on Poiseuille flow. Flow enhancement in the latter case is an order of magnitude larger than in the former. A regular perturbation in terms of the amplitude of the oscillation is used and closed form formulas given for mass transport rates at the lowest significant order. In particular it is shown that a mean flow may be generated even when the pressure gradients oscillate around a zero mean or the boundary waves are superposed on a fluid at rest if the frequencies of two superposed waves are in certain ratios.

AB - Important flow enhancement effects take place when the motion of a non‐Newtonian fluid is driven either by pressure gradients pulsating around a non‐zero mean or by longitudinal and transversal boundary waves superposed on Poiseuille flow. Flow enhancement in the latter case is an order of magnitude larger than in the former. A regular perturbation in terms of the amplitude of the oscillation is used and closed form formulas given for mass transport rates at the lowest significant order. In particular it is shown that a mean flow may be generated even when the pressure gradients oscillate around a zero mean or the boundary waves are superposed on a fluid at rest if the frequencies of two superposed waves are in certain ratios.

UR - http://www.scopus.com/inward/record.url?scp=84986773249&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84986773249&partnerID=8YFLogxK

U2 - 10.1002/masy.19890230107

DO - 10.1002/masy.19890230107

M3 - Article

VL - 23

SP - 73

EP - 90

JO - Makromolekulare Chemie. Macromolecular Symposia

JF - Makromolekulare Chemie. Macromolecular Symposia

SN - 0258-0322

IS - 1

ER -