Fluid-particle drag force in binary-solid suspensions

Renzo Di Felice, Marco Rotondi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The drag force on a particle in a multiparticle suspension is a function of the particle-fluid relative velocity and of the particle volume concentration. Its determination heavily relies on experimental observations, as theoretical support is still limited to viscous flow regime and dilute solid concentrations. When uniform particle suspensions are considered, there is a certain abundance of experimental data available which has permitted the proposition of simple and reliable relationships for the determination of the drag force: these relationships are normally expressed through the use of the so-called "voidage function", i.e. a function by which the drag force on an isolated particle has to be multiplied in order to obtain the drag force on a particle in a multiparticle suspension. The extension of the approach mentioned above to suspensions made up of particles differing in size and density has been attempted here and new simple relationships are presented for the case of binary-solid systems. The basic idea draws an analogy between binarysolid suspension and single-particle suspensions thereby making possible the use of well established results. The simple relationships obtained for the estimation of the drag force on a particle in a binary-solid suspension have been tested, with satisfactory success, against experimental data available in literature.

Original languageEnglish
Article numberA29
JournalInternational Journal of Chemical Reactor Engineering
Issue number1
Publication statusPublished - Dec 1 2012


  • Binary-solid mixtures
  • Drag force
  • Suspensions
  • Voidage function

ASJC Scopus subject areas

  • Chemical Engineering(all)


Dive into the research topics of 'Fluid-particle drag force in binary-solid suspensions'. Together they form a unique fingerprint.

Cite this