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  • 1990-1994  (10)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Spectral analysis of wall turbulence with a bicircular electrochemical probe (1993)
    Springer
    Experiments in fluids 16 (1993), S. 97-104 
    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 calculation of the mass flux/velocity gradient transfer function at a wall in the direction parallel to the wall and perpendicular to the mean flow direction, has been performed in linear conditions. This transfer function is relevant to the difference of the mass fluxes between two semicircular surfaces separated by an infinitely thin gap aligned with the flow direction. Electrochemical measurements in turbulent flow were performed with segmented electrodes having this geometry and devised by a photolithographic technique. The spectra of the velocity gradient fluctuations in the longitudinal and transverse directions were calculated and hence the turbulence intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944911
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Three-segment electrodiffusion probes for measuring velocity fields close to a wall (1990)
    Springer
    Experiments in fluids 9 (1990), 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 Three-segment electrodiffusion probes embedded in a wall allow to determine simultaneously the three kinematic parameters of flow close to the probe surface: the flow directionθ, the wall shear rateq, and the normal velocity coefficientA,v z = −A z 2. A well-controlled three-dimensional flow, generated by a rotating disk, was used to demonstrate the capabilities of this new kind of electrodiffusion probes by comparing experimental results with the prediction based on the well-known hydrodynamical theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00575334
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Application of the Electrohydrodynamical Impedance Method to the Study of Corrosion Inhibitors (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 44-45 (Jan. 1991), p. 205-212 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.44-45.205.pdf
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Mass transfer enhancement by suspensions in a shear flow (1991)
    Springer
    Journal of applied electrochemistry 21 (1991), S. 1081-1086 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrochemical measurement of mass transfer enhancement in a dilute suspension of particles, due to particle rotation in the presence of a shear flow, has been studied with a Couette cell. An effective diffusivityD e involving the Peclet numberPe of the particles and the molecular diffusivityD of the solute was obtained for low particle volume fraction ϕ asD e=D(1+3.5ϕPe 1/2). From steady-state and transient data, it was shown that aggregation may occur with alumina particles and that inertial effects due to centrifugation reveal a marginal layer free of particles near the rotating inner cylinder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041451
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen as a tracer for measurements of steady and turbulent flows (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 835-842 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The reduction of dissolved oxygen has been studied over a wide conductivity range for use in steady or nonsteady hydrodynamic measurements. Mass transfer fluctuations can be analysed statistically to obtain the power spectra of hydrodynamic fluctuations. This requires a consideration of the proton reduction, which prevents diffusion from limiting the current. The transfer function for deducing the hydrodynamic spectra from mass transfer spectra includes not only transport effects but also kinetic effects which account for the finite rate of the reaction. The experimental study was performed using electrohydrodynamic (EHD) impedance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01023727
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A three-segment electrodiffusion probe in axisymmetric flow with stagnation and separation (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 676-684 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Calculation is presented of the influence of the normal velocity component on the directional characteristics of a three-segment electrochemical probe in the vicinity of a stagnation or a separation point. The results obtained here for a 2D flow corresponding to an axisymmetric flow having a stagnation point show quantitative differences, especially in the stagnation region, with respect to an earlier calculation performed on a 2D flow corresponding to a planar flow having a stagnation line. An experimental study with such a probe is then reported which demonstrates the possibility of this arrangement in the stagnation region of an immersed jet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252095
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental studies on selenium cluster structures (1993)
    Springer
    The European physical journal 26 (1993), S. 352-354 
    Details
    ISSN: 1434-6079
    Keywords: .64.70.Fx ; 36.40.+d ; 35.20.Vf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we report properties of selenium clusters produced by vapor condensation technique. Impact electronic ionization is performed on clusters in the size range from 2 to 36 atoms. The measured ionization potentials exhibit small oscillation corresponding to the wiggles observed on the mass distribution. An attempt to connect these experimental observations with the geometrical structure of the molecules is made in the discussion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429192
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Study of selenium clusters (1992)
    Springer
    The European physical journal 24 (1992), S. 87-93 
    Details
    ISSN: 1434-6079
    Keywords: 64.70.Fx ; 36.40. + d ; 35.20.Vf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The aim of this paper is to study the properties of selenium clusters produced by vapor condensation technique. Simulation of nucleation process up to 50 atoms are in favour of a structure close to the amorphous structure. Doubly charged clusters are also obtained in the mass spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436608
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Structure of small rare earth clusters (1991)
    Springer
    The European physical journal 19 (1991), S. 191-193 
    Details
    ISSN: 1434-6079
    Keywords: 35.20.Vf ; 36.40. +d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rare earth clusters are produced by the inert gas condensation technique. The observed size distribution shows large peaks atn=13, 19, 23, 26, 29, 32, 34, 37, 39, 45, ... The beginning of this sequence (up to 34) has been already observed in argon clusters and recently by our group in barium clusters; this sequence may be interpreted in terms of icosahedral structures corresponding to the addition of caps on a core icosahedron of 13 atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448289
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison between selenium and tellurium clusters (1991)
    Springer
    The European physical journal 19 (1991), S. 237-239 
    Details
    ISSN: 1434-6079
    Keywords: 35.20.Vf ; 36.40. +d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selenium and tellurium clusters are produced by the inert gas condensation technique. The mass spectra of both species are completely different and reveal different properties. In selenium, a periodicity of 6–7 is observed and may be interpreted by the binding energy between small cyclic molecules. Moreover, it was very difficult to obtained large clusters probably because the binding energy between these molecules is very small. In tellurium, these periodic structures do not exist and large clusters are easily obtained in nucleation conditions where only small selenium clusters are present. These results are discussed and a simple nucleation model is used to illustrate this different behavior. Finally these clusters properties are correlated to the bulk structure of both materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448301
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    Paper (German National Licenses)
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