Luis Blay

Bardehle Pagenberg

Mean-flow measurements of turbulent boundary layers over porous walls (permeable and rough) with varying pore size (s), permeability (K) and thickness (h) are presented across a wide range of friction Reynolds numbers (Reτ≈2000–18000) and permeability based Reynolds numbers (ReK≈1.5–60). The mean wall shear stress was determined using a floating el...

The motion of thin curved falling particles is ubiquitous in both nature and industry but is not yet widely examined. Here, we describe an experimental study on the dynamics of thin cylindrical shells resembling broken bottle fragments settling through quiescent fluid and homogeneous anisotropic turbulence. The particles have Archimedes numbers bas...

The future of single cell diversity screens involves ever-larger sample sizes, dictating the need for higher throughput methods with low analytical noise to accurately describe the nature of the cellular system. Current approaches are limited by the Poisson statistic, requiring dilute cell suspensions and associated losses in throughput. In this co...

p>The future of single cell diversity screens involves ever-larger sample sizes, dictating the need for higher throughput methods with low analytical noise to accurately describe the nature of the cellular system. Current approaches are limited by the Poisson statistic, requiring dilute cell suspensions and associated losses in throughput. In this...

The future of single cell diversity screens involves ever-larger sample sizes, dictating the need for higher throughput methods with low analytical noise to accurately describe the nature of the cellular system. Current approaches are limited by the Poisson statistic, requiring dilute cell suspensions and associated losses in throughput. In this co...

The motion of thin curved falling particles is ubiquitous in both nature and industry but is not yet widely examined. Here, we describe an experimental study on the dynamics of thin cylindrical shells resembling broken bottle fragments settling through quiescent fluid and homogeneous anisotropic turbulence. The particles have Archimedes numbers bas...

The aim of this chapter is to investigate experimentally the effect of the frontal geometry on the settling dynamics of planar particles in quiescent flow. The question “What if the disc has a wavy edge?” formulated in Moffat (J Fluid Mech 720:1–4, 2013) is extended here not only to sinusoidal edge particles but to sharp edge polygons and three stu...

Despite the ubiquity of turbulent flows with non-spherical particles, it has been only relatively recently that experiments have been developed to measure the motion and orientation of individual particles in a turbulent environment. Early experimental work was focused on particle motion in complex cases relevant to specific applications; Bernstein...

This chapter presents an experimental facility designed to generate and control turbulence in a laboratory. This consists of a modified version of the random jet array (RJA) proposed in Bellani and Variano (Exp Fluids 55:1646–1666, 2013, [1]) that allows us to generate homogeneous and anisotropic turbulence. Moreover, this zero-mean flow facility c...

This paper describes an experimental investigation of the dynamics of freely falling thin circular disks settling through turbulence. The patterns of the three dimensional disk motion are studied using an orthogonal arrangement of two high speed cameras. Turbulence is generated in a water tank using a random jet array facility where the jets are mo...

The wake characteristics of various thin particles with identical material properties but different frontal geometries (disks, hexagonal plates and square plates) are examined by means of three dimensional measurements of the instantaneous velocity field. The reference particle is a circular disk that lies within the Reynolds number—dimensionless m...

Recent experimental and numerical investigations have enabled researchers to study directly the 3D time dependent motion of spherical and quasi-spherical particles in quiescent and turbulent flows. At the same time, fibre-like particles have been also extensively investigated during the last decades due to the high relevance of these geometries in...

We experimentally investigate the temporal decay of homogeneous anisotropic turbulence, monitoring the evolution of velocity fluctuations, dissipation and turbulent length scales over time. We employ an apparatus in which two facing random jet arrays of water pumps generate turbulence with negligible mean flow and shear over a volume that is much l...

This paper presents a study of the terminal fall velocity, drag coefficient and descent style of ‘wavy-edge’ flat particles. Being highly non-spherical and with a size of up to a few centimeters, these particles show strong self-induced motions that lead to various falling styles that result in distinct drag coefficients. This study is based on exp...

The effect of particle edge geometry on the descent motion of free falling planar particles is examined through experiments. Various planar particles, such as disk and polygons, with identical frontal areas ($A_p$) and different number of edges (or perimeter) are used. All particles are designed such that their values of Galileo number (G) and dime...

This experimental investigation deals with the influence of free-stream turbulence (FST) produced by an active grid on the skin-friction of a zero-pressure- gradient turbulent boundary layer. Wall shear stress is obtained by oil-film interferometry (OFI). Additionally, hot-wire anemometry was performed to obtain wall-normal profiles of streamwise v...

The free fall motion of a thin disk with small dimensionless moment of inertia was investigated experimentally and compared with the motion of a thin square plate. Both thin particles share the same frontal area but have a significant difference in the dimen-sionless moment of inertia, being I * ≈ 5 · 10 −3 for the disk and I * ≈ 1.7 · 10 −3 for th...

Mixed municipal solid waste currently landfilled contains a high percentage of packaging glass, varying from 33% to 80% by weight according to several sample characterizations, due to the lack of high throughput separation technology. The hydrodynamic separator proposed is a closed-loop device developed to separate co-mingled waste into plastics, g...

The use of a short-duration laser as a light source for Schlieren flow visualization is described. The coherent nature of this light source has been removed using the laser-induced fluorescence principle. The quality of the speckle-free pictures obtained competes with the one achieved using conventional illumination techniques. Flow features are fr...