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Showing 1 to 13 of 13 for “"particle entrainment"”.
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Particle motion in the near bed region of a turbulent open channel flow: Implications for bedload transport by saltation and sediment entrainment into suspension
… processes involved in the transport of sediment particles in the near bed region of a turbulent open channel flow. Two different aspects of this phenomenon are examined, namely the mode of transport denoted as saltation, and the process of particle entrainment into suspension. The main approach …
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Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet
… a significant amount of research into two-phase particle transport. The terrorist events of September 11, 2001 sparked a series of studies analyzing particle entrainment and deposition in turbulent airflows. One area of research needing further attention has been the study of particles entrained …
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Experimental Investigation of the Role of Turbulence Fluctuations on Incipient Motion of Sediment
… experimental program included measurements of particle entrainment rates of a mobile grain and turbulence induced forces acting upon a fixed grain for a range of flow conditions. In addition, near bed flow velocities were measured synchronously with both the entrainment and pressure …
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The Role of Instantaneous Forces in Particle Movement
… are needed to determine the point at which a particle will move. Turbulent fluctuations in velocity seem to have an effect of particle entrainment. The fluctuations in velocity can be several times greater than their time averaged counterparts. These short durations of high velocity often …
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A study of interfacial waves and heat transfer for turbulent condensation in vertical tubes
… mass flow given by an energy balance and an entrainment correlation. The results indicated a heavy concentration of liquid particle entrainment in the neighborhood of the film. In addition, the axial profiles of the local heat fluxes and local heat transfer coefficients across the film were …
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Pneumatic Particulate Collection System for an Unmanned Ground Sampling Robot
… investigated experimentally: jet impingement and particle entrainment (i.e. steep attack angle and parallel flow). Turbulent, free jet characteristics and critical velocities of particles are studied. Ultimately, a final design is presented that effectively collects particulate material from the …
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Modeling the Effect of Particle Diameter and Density on Dispersion in an Axisymmetric Turbulent Jet
Creating effective models predicting particle entrainment behavior within axisymmetric turbulent jets is of significant interest to many areas of study. Research into multiphase flows within turbulent structures has primarily focused on specific geometries for a target application, with little …
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Laboratory Experiments Investigating Entrainment By Debris Flows
… of the debris flow. The mechanics underlying the particle entrainment are not well-understood. Existing models for the entrainment process include those that explicitly consider stress ratios, the angle of inclination, and the particle fluxes relative to those achieved under steady conditions. …
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Solid Fuel Blend Pyrolysis-Combustion Behavior and Fluidized Bed Hydrodynamics
… applied to quantify the hydrodynamics behavior. Particle Image Velocimetry and Digital Image Analysis algorithms were used to investigate the evolution of multiple inlet gas jets located at its distributor base. Results were used to develop a comprehensive grid-zone phenomenological model and …
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Hydrodynamic controls on the movement of invertebrate larvae and organic matter in small streams
… The degree to which water velocity and particle shape influence the retention of organic matter (including deciduous leaves, conifer needles, red-cedar fronds, and branch fragments) was examined to determine how physical factors determine detrital resource availability in streams. …
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Part I: Geostatistical Interpolation of Rain Fields Using Radar Estimates and Gauge Observations: Algorithm Design and Automation; Part II: Energy Dissipation in Fluid Flows and Wave Transformation by Porous Barriers and Submerged Cavities
… study. Finally, the induced vortices and fluid particle entrainment process as solitary waves propagated past a submerged cavity were studied experimentally. The PLIF technique was used to visualize the wave field and evolved vortices around the cavity zone. The maximum transporting distance of …
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Pneumatic Particulate Collection System Analysis and Design
… multiphase flow model to examine the particulate entrainment performance. The improved collection system efficiently expanded and developed the gas flow prior to the collection area to employ the particulate entrainment process. The final design was constructed with an additive manufacturing …
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Initiation of Particle Movement in Turbulent Open Channel Flow
… the flow conditions that lead to coarse grain entrainment at near incipient motion conditions. Herein, a new conceptual approach is proposed, which in addition to the magnitude of hydrodynamic force or flow power, takes into account the duration of the flow event. Two criteria for inception of …