Results 21 to 30 of about 90,108 (307)
On the Stokes number and characterization of aerosol deposition in the respiratory airways [PDF]
, 2015 Aerosol deposition in the respiratory airways has traditionally been examined in terms of the Stokes number based on the reference flow timescale. This choice leads to large scatter in deposition efficiency when plotted against the reference Stokes number because the velocity and length scales experienced by advected particles deviate considerably from
Nicolaou, L, Zaki, TA
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Particle Dispersion and Coherent Fine Scale Eddies in Turbulence
Journal of Fluid Science and Technology, 2008 Direct numerical simulations of homogeneous isotropic turbulence laden with particles have been conducted to clarify the relationship between particle dispersion and coherent fine scale eddies in turbulence.
Makoto SATO +2 more
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A nonperturbative approximation for the moderate Reynolds number Navier–Stokes equations [PDF]
Proceedings of the National Academy of Sciences, 2009 The nonlinearity of the Navier–Stokes equations makes predicting the flow of fluid around rapidly moving small bodies highly resistant to all approaches save careful experiments or brute force computation. Here, we show how a linearization of the Navier–Stokes equations captures the drag-determining features of the flow and allows simplified or ...
Roper, Marcus, Brenner, Michael P.
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Identification of a particle collision as a finite-time blowup in turbulence
Scientific Reports, 2023 We propose an Eulerian approach to investigate the motion of particles in turbulence under the assumption that the motion of particles remains smooth in space and time until a collision between particles occurs. When the first collision happens, particle
Seulgi Lee, Changhoon Lee
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Visualization of synthetic jets at higher Stokes numbers [PDF]
EPJ Web of Conferences, 2012 Visualization of synthetic jets at higher Stokes numbers (S = 90 and 127) by the phase-locked smoke-wire technique is presented and discussed. The working fluid is air. The Reynolds numbers are quantified using hot-wire anemometry. Although our method of visualization essentially provides only qualitative results, the present study also demonstrates ...
Trávníček Zdeněk +2 more
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Scalable Block Preconditioners for Linearized Navier-Stokes Equations at High Reynolds Number
Algorithms, 2020 We review a number of preconditioners for the advection-diffusion operator and for the Schur complement matrix, which, in turn, constitute the building blocks for Constraint and Triangular Preconditioners to accelerate the iterative solution of the ...
Filippo Zanetti, Luca Bergamaschi
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Distribution of Particles and Bubbles in Turbulence at a Small Stokes Number [PDF]
Physical Review Letters, 2012 The inertia of particles driven by the turbulent flow of the surrounding fluid makes them prefer certain regions of the flow. The heavy particles lag behind the flow and tend to accumulate in the regions with less vorticity, while the light particles do the opposite.
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Collision and Coagulation in the Infinite-Stokes-Number Regime [PDF]
Aerosol Science and Technology, 1998 This paper presents a theoretical description of collision and coagulation in the infinite-Stokes-number limit where particle motions are only weakly correlated with the fluid. A methodology for predicting the collision frequency and the particle mean energy is developed based on the assumption of a Maxwellian velocity distribution.
Walter C. Reade, Lance R. Collins
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Wall effects on the transportation of a cylindrical particle in power-law fluids [PDF]
, 2011 The present work deals with the numerical calculation of the Stokes-type drag undergone by a cylindrical particle perpendicularly to its axis in a power-law fluid.
A. Ambari +5 more
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Oseen's correction to stokes drag on axially symmetric arbitrary particle in transverse flow: A new approach [PDF]
Theoretical and Applied Mechanics, 2014 In this paper, Oseen’s correction to Stokes drag experienced by axially symmetric particle placed in a uniform stream perpendicular to axis of symmetry(i.e. transverse flow) is obtained.
Srivastava Deepak Kumar +1 more
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