Effects of solid inertial particles on the velocity and temperature statistics of wall bounded turbulent flow

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effect of solid inertial particles on the velocity and temperature statistics of a non-isothermal turbulentchannel flow is studied using direct numerical simulation. The particles inertia is varied by changingthe particles diameter. The density of particles is kept constant. A two-way coupled Eulerian–Lagrangianapproach is adopted to solve the carrier flow field and the motion of dispersed particles. Three differentparticle Stokes numbers of St = 24, 60, 192, at a constant particle mass loading of φm = 0:54, are considered.The mean and rms profiles of velocity and temperature for fluid and particles, and the scatter plotsof fluid-particle temperature differences are presented. In addition, the variations of different budgetterms for the turbulent kinetic energy equation and fluctuating temperature variance equation in thepresence of particles are reported. The fluid turbulent heat flux is reduced by the presence of particles,and in spite of the additional heat exchange between the carrier fluid and the particles, the total heattransfer rate stays always lower for particle-laden flows. To further clarify this issue, the total Nusseltnumber is split into a turbulence contribution and a particle contribution, and the effects of particles inertiaon fluid turbulent heat flux and fluid-particle heat transfer are examined in detail
Original languageEnglish
JournalInternational Journal of Heat and Mass Transfer
Volume106
Pages (from-to)1014–1024
ISSN0017-9310
DOIs
Publication statusPublished - 2016

Keywords

  • Turbulent channel flow
  • Solid particles
  • Kinetic energy budgets
  • Two-way coupling
  • Heat transfer

Fingerprint Dive into the research topics of 'Effects of solid inertial particles on the velocity and temperature statistics of wall bounded turbulent flow'. Together they form a unique fingerprint.

Cite this