scholarly journals Turbulence measurement in a two-dimensional channel flow using the three-dimensional particle tracking velocimeter.

1989 ◽  
Vol 9 (34) ◽  
pp. 241-244 ◽  
Author(s):  
Koichi Nishino ◽  
Nobuhide Kasagi
Keyword(s):  
Channel Flow ◽  
Particle Tracking ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Turbulence Measurement

scholarly journals Three-dimensional particle tracking in microfluidic channel flow using in and out of focus diffraction

2015 ◽  
Vol 45 ◽  
pp. 218-224 ◽  
Author(s):  
Bushra Tasadduq ◽  
Gonghao Wang ◽  
Mohamed El Banani ◽  
Wenbin Mao ◽  
Wilbur Lam ◽  
...  
Keyword(s):  
Channel Flow ◽  
Particle Tracking ◽  
Three Dimensional ◽  
Microfluidic Channel

scholarly journals Measurement of Lagrangian Trajectories in a 3 L Stirred Tank Reactor using 4D Particle Tracking Velocimetry with Shake-the-Box

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Jürgen Fitschen ◽  
Alexandra Von Kameke ◽  
Sebastian Hofmann ◽  
Marko Hoffmann ◽  
Michael Schlüter
Keyword(s):  
Flow Field ◽  
Particle Tracking ◽  
Particle Tracking Velocimetry ◽  
Three Dimensional ◽  
Field Measurements ◽  
Stirred Tank ◽  
Two Dimensional ◽  
Scientific Publications ◽  
Stirred Tank Reactor ◽  
Tank Reactor

Stirred tank reactors are widely used in the chemical industry and bioprocess engineering and, consequently, a large number of scientific publications deal with the characterization of those apparatuses. However, there is very little information about the flow conditions. This is mostly due to the fact that these apparatuses are generally made of stainless steel, which restricts optical access. Furthermore, three-dimensional flow field measurements are still not trivial and involve costly equipment, therefore, investigations often reduce to two-dimensional PIV measurements. Nevertheless, recent works (Rosseburg et al., 2018; Taghavi and Moghaddas, 2020; Kuschel et al., 2021) impressively show the formation of compartments which hinder and delay mixing. However, these measurements are based either on instantaneous concentration profiles by means of pLIF measurements or on a two-dimensional projection of the system and thus do not allow conclusions about the development of the three dimensional compartments and the exchange rates between the compartments. In this work, for the first time, instantaneous flow field measurements with high spatial and temporal resolution are performed in the entire volume of a 3L stirred tank reactor based on 4D particle tracking velocimetry. The highly resolved particle trajectories further allow detailed Lagrangian analysis of the mixing dynamics inside the reactor, data that was previously inaccessible.

scholarly journals Two-Dimensional and Three-Dimensional Single Particle Tracking of Upconverting Nanoparticles in Living Cells

2019 ◽  
Vol 20 (6) ◽  
pp. 1424 ◽  
Author(s):  
Kyujin Shin ◽  
Yo Song ◽  
Yeongchang Goh ◽  
Kang Lee
Keyword(s):  
Particle Tracking ◽  
Single Particle ◽  
Near Infrared ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Living Cells ◽  
Single Particle Tracking ◽  
Infrared Light ◽  
Objective Lens ◽  
Two Dimensional

Lanthanide-doped upconversion nanoparticles (UCNPs) are inorganic nanomaterials in which the lanthanide cations embedded in the host matrix can convert incident near-infrared light to visible or ultraviolet light. These particles are often used for long-term and real-time imaging because they are extremely stable even when subjected to continuous irradiation for a long time. It is now possible to image their movement at the single particle level with a scale of a few nanometers and track their trajectories as a function of time with a scale of a few microseconds. Such UCNP-based single-particle tracking (SPT) technology provides information about the intracellular structures and dynamics in living cells. Thus far, most imaging techniques have been built on fluorescence microscopic techniques (epifluorescence, total internal reflection, etc.). However, two-dimensional (2D) images obtained using these techniques are limited in only being able to visualize those on the focal planes of the objective lens. On the contrary, if three-dimensional (3D) structures and dynamics are known, deeper insights into the biology of the thick cells and tissues can be obtained. In this review, we introduce the status of the fluorescence imaging techniques, discuss the mathematical description of SPT, and outline the past few studies using UCNPs as imaging probes or biologically functionalized carriers.

Flow around an unsteady thin wing close to curved ground

1991 ◽  
Vol 226 ◽  
pp. 175-187 ◽  
Author(s):  
Qian-Xi Wang
Keyword(s):  
Channel Flow ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Ground Surface ◽  
Ground Effect ◽  
Vortex Sheet ◽  
Image Method ◽  
Two Dimensional ◽  
Thin Wing ◽  
Close Proximity

The method of matched asymptotic expansions is applied to the flow analysis of a three-dimensional thin wing, moving uniformly in very close proximity to a curved ground surface. Four flow regions, i.e. exterior, bow, gap, and wake, are analysed and matched in an appropriate sequence. The solutions in expansions up to third order are given both in nonlinear and linear cases. It is shown that the flow above the wing is reduced to a direct problem, and the flow beneath it appears to be a two-dimensional channel flow. The wake assumes a vortex-sheet structure close to the curved ground, undulating with the amplitude of the ground curvature, and the flow beneath it is also two-dimensional channel flow. As a consequence, an equivalence is found between the extreme curved-ground effect and the corresponding flat-ground effect, which can be treated by the image method.

Volume Particle Tracking in Three-Dimensional Micro-Channel Flows

2008 ◽  
Author(s):  
Darren L. N. Homeniuk ◽  
David S. Nobes ◽  
Shahnawaz Molla ◽  
Subir Bhattacharjee
Keyword(s):  
Channel Flow ◽  
Particle Tracking ◽  
Imaging System ◽  
Tracking System ◽  
Membrane Surface ◽  
Three Dimensional ◽  
Micro Channel ◽  
Filter Membrane ◽  
Experimental Application ◽  
Scanning Imaging

A micro-fluidic technique has been developed that uses a combination of dielectorphoresis and tangential flow to remove particles from a filter membrane. To assess the characteristics of particle motion at the membrane surface, a volume scanning imaging system has been developed to track the three-dimensional motion of particles in this micro-channel flow. The development of the image and tracking system is described and results highlighting experimental application of the technique are presented.

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