title: Influence of particles on the transition to turbulence in pipe flow.
abstract: We investigate by experiment the influence of suspended solids upon the transition to turbulence in pipe flow. The particles are monodisperse and neutrally buoyant with the liquid. The role of the particles on the transition depends upon both the volume fraction, phi, and particle size. Below a critical particle diameter, particles alter the transition to larger critical Reynolds numbers for all phi. In contrast to this, larger particles move the transition to smaller Reynolds numbers for small phi, but they delay the transition at larger concentration.
authors.affiliation: Institut Universitaire des Systèmes Thermiques Industriels, CNRS-UMR 6595, Technopôle Château Gombert, 13453 Marseille Cedex 13, France.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Matas
authors.forename: Jeffrey F
authors.initials: JF
authors.lastname: Morris
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Guazzelli
mesh_terms: D008863:Microspheres; D009038:Motion; D017711:Nonlinear Dynamics; D010316:Particle Size; D011312:Pressure; D012212:Rheology / Q000295:instrumentation / Q000379:methods*; D012680:Sensitivity and Specificity; D013535:Suspensions
chemical_list: D013535:Suspensions