A numerical investigation of the detachment of the trailing particle from a chain sedimenting in newtonian and viscoelastic fluids

N. A. Patankar, H. H. Hu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Particles sedimenting in a viscoelastic fluid form chains. It has been observed in experiments that, sometimes, the last particle in the chain gets detached. In this paper, we investigate this phenomenon. It is known that a long chain falls faster than a single particle in fluids. This long body effect tends to detach the last particle from the chain. The wake effect and the normal stress effect are the mechanisms that work against the long body effect. The last particle is not detached if the inertial wake effects are strong enough to cause substantial drag reduction on it. The detachment is also restricted by the elastic normal stress of the viscoelastic fluid.

Original languageEnglish (US)
Pages (from-to)517-521
Number of pages5
JournalJournal of Fluids Engineering, Transactions of the ASME
Volume122
Issue number3
DOIs
StatePublished - Sep 2000

ASJC Scopus subject areas

  • Mechanical Engineering

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