Fundamental characteristics of viscoelastic fluid modeled by beeds, springs and dampers (mechanism of second normal stress difference generation by dampers)

Takuji Ishikawa, Nobuyoshi Kawabata, Katsushi Fujita, Yutaka Miyake

Research output: Contribution to journalArticlepeer-review

Abstract

Flow of viscoelastic fluid is commonly analyzed by using constitutive equations. In this paper, bead-spring-damper macro model is proposed as an alternative to analyze viscoelastic flow. The tetrahedral structure of beads, springs and dampers models a gathering of intertwined polymer chains. Behavior of the bead-spring-damper structure is computed under simple shear flow condition. Shear-thinning of shear viscosity and the mechanism of second normal stress difference generation are investigated. The results show that the phase lag of the tension, caused by the damper element, is the mechanism of second normal stress difference generation, and that the bead-springdamper macro model can express characteristics of viscoelastic fluid consistently.

Original languageEnglish
Pages (from-to)2049-2055
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume66
Issue number648
DOIs
Publication statusPublished - 2000 Aug
Externally publishedYes

Keywords

  • Beed-spring-damper macro model
  • Fluid dynamics
  • Non-newtonian fluid
  • Numerical analysis
  • Shear flow
  • Viscoelastic fluid

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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