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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of particles suspended in convective flow in differentially heated cavity (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 1130-1140 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Our aim is to explore, both experimentally and theoretically, the cumulative effects of small particle–liquid density difference, where the particles are used as tracers in recirculating flow. As an example we take a flow field generated in a differentially heated cavity. The main flow structure in such a cavity consists in one or two spiraling motions. Long-term observations of such structures with the help of tracers (small particles) indicated that accumulation of the particles may set in at some flow regions. For theoretical insight into the phenomenon, a simple analytical model of recirculating (rotating) flow was studied. It was assumed that particles are spherical and rigid, and their presence does not affect the flow field. The particle Reynolds number is negligibly small, hence only the effects of particle–liquid density difference are of importance. Besides buoyancy, the effects of Saffman's force and the inertial forces are also taken into account when calculating particle trajectories. Both cases were analyzed, particles with density slightly higher and lower than the fluid. It was found that in our case the inertial forces are negligible. In the numerical experiment trajectories of particles were investigated. The particles were allocated at random in the flow field obtained by numerical solution of the natural convection in the differentially heated cavity. In the experimental part, behavior of a dilute particle suspension in the convective cell was explored. In the model-analytical study of a simple spiraling motion, it was found that due to the interaction of the recirculating convective flow field and the gravity-buoyancy force, the particles may be trapped in some flow regions, whereas the rest of the flow field becomes particle-free. This prediction agrees fairly well with the numerical and experimental findings. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868913
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  • 2
    Electronic Resource
    Electronic Resource
    An experimental study of evaporating small diameter jets (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1883-1890 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The behavior of evaporating small diameter jets in a low-pressure environment is studied experimentally. Charged coupled device (CCD) cameras connected to a computerized data logging system are employed for high-speed imaging. Experiments at different jet velocities and environmental pressures have been performed with pure ether and ethanol, and also the mixtures of the two. Complex instability structures during the evaporation of the jet were observed. The recorded experimental evidences of these structures are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858814
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of dynamic surface tension by the oscillating droplet method (1993)
    Springer
    Experiments in fluids 15 (1993), S. 332-340 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An optical measuring method has been applied to determine the dynamic surface tension of aqueous solutions of heptanol. The method uses the frequency of an oscillating liquid droplet as an indicator of the surface tension of the liquid. Droplets with diameters in the range between 100 and 200 μm are produced by the controlled break-up of a liquid jet. The temporal development of the dynamic surface tension of heptanol-water solutions is interpreted by a diffusion controlled adsorption mechanism, based on the “three-layer” model of Ward and Tordai. Measured values of the surface tension of bi-distilled water, and the pure dynamic and static (asymptotic) surface tensions of the surfactant solutions are in very good agreement with values obtained by classical methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223411
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  • 4
    Electronic Resource
    Electronic Resource
    Particle image velocimetry with optical flow (1998)
    Springer
    Experiments in fluids 25 (1998), S. 177-189 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  An optical Flow technique based on the use of Dynamic Programming has been applied to Particle Image Velocimetry thus yielding a significant increase in the accuracy and spatial resolution of the velocity field. Results are presented for calibrated synthetic sequences of images and for sequences of real images taken for a thermally driven flow of water with a freezing front. The accuracy remains better than 0.5 pixel/frame for tested two-image sequences and 0.2 pixel/frame for four-image sequences, even with a 10% added noise level and allowing 10% of particles of appear or disappear. A velocity vector is obtained for every pixel of the image.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050222
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  • 5
    Electronic Resource
    Electronic Resource
    An experimental study of the lateral migration of a droplet in a creeping flow (1986)
    Springer
    Experiments in fluids 5 (1986), S. 43-48 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The distribution of droplets in a plane Hagen-Poiseuille flow of dilute suspensions has been measured by a special LDA technique. This method assumes a well defined relation between the velocity of the droplets and their lateral position in the channel. The measurements have shown that the droplet distribution is non-uniform and depends on the viscosity ratio between the droplets and the carrier liquid. The results have been compared with a theory by Chan and Leal describing the lateral migration of suspended droplets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272424
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  • 6
    Electronic Resource
    Electronic Resource
    Computer-aided discrimination of slow and fast tracer paths (1992)
    Springer
    Experiments in fluids 13 (1992), S. 239-248 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An optical method for the discrimination between slow and fast tracer particles convected within a flow is proposed. It is based on the dependence of the brightness of a trace on the velocity of the corresponding tracer. The images of the traces are captured by a CCD-camera and processed on-line. A practical application of this technique to the visualization of the low velocity streamlines in a rotating duct is presented. The possibilities to develop this technique into a quantitative tool for velocity measurements is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189016
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Concentration and velocity measurements in the flow of droplet suspensions through a tube (1984)
    Springer
    Experiments in fluids 2 (1984), S. 213-219 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two optical methods, light absorption and LDA, are applied to measure the concentration and velocity profiles of droplet suspensions flowing through a tube. The droplet concentration is non-uniform and has two maxima, one near the tube wall and one on the tube axis. The measured velocity profiles are blunted, but a central plug-flow region is not observed. The concentration of droplets on the tube axis and the degree of velocity profile blunting depend on relative viscosity. These results can be qualitatively compared with the theory of Chan and Leal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571868
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    Paper (German National Licenses)
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