Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Laser Doppler measurement of turbulence parameters in a two-dimensional plane wall jet (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 3116-3129 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A computer-controlled data acquisition system has been designed and constructed to automate measurement of turbulent velocity correlations in a two-dimensional turbulent wall jet. Measurements are made with a single component laser Doppler velocimeter system in a flow of air on a flat plate with stagnant surroundings. Measurements of a number of turbulence parameters have been completed and compared with existing hot-wire data. The measurements are made at two downstream locations at a Reynolds number, based on slot width, of 14 000. Earlier hot-wire data for a two-dimensional turbulent wall jet in stagnant surroundings show much scatter in the outer region where local turbulence intensities range from 40% to 70%. The laser Doppler velocimeter gives repeatable values and eliminates the bias in hot-wire measurements due to reversing flow and errors in corrections for high turbulence effects. The measured turbulent normal stresses are somewhat higher than those previously reported throughout the flow field. The turbulent shear stress is in good agreement with previous hot-wire results near the wall. Hot wires are shown to indicate low values of the Reynolds stress in the turbulent outer regions where they are affected by strong flow reversals. The new measurements agree well with predictions based on momentum integral methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868136
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Turbulent and Transition Pipe Flow of Dilute Aqueous Polymer Solutions (1969)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 8 (1969), S. 498-502 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160031a021
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Velocity and turbulence measurements in combustion systems (1983)
    Springer
    Experiments in fluids 1 (1983), S. 93-99 
    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 A laser-Doppler velocimeter is used in the measurement of high-temperature gas flows. A two-stage fluidization particle generator provides magnesium oxide particles to serve as optical scattering centers. The one-dimensional dual-beam system is frequency shifted to permit measurements of velocities up to 300 meters per second and turbulence intensities greater than 100 percent. Exiting flows from can-type gas turbine combustors and burners with pre-mixed oxy-acetylene flames are described in terms of the velocity, turbulence intensity, and temperature profiles. The results indicate the influence of the combustion process on turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266261
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A parametric study of boiling in a porous bed (1982)
    Springer
    Heat and mass transfer 16 (1982), S. 119-126 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Der Siedevorgang in einer körnigen Schichtung bewirkt oft, daß sich in ihr mehrere Schichten ausbildeneine unveränderte kapillare Schicht, darüber eine Zwischenschicht mit horizontalen Sprüngen und darüber eine Schicht durchsetzt von vertikalen Kanälen. Unter diesen Schichten trocknet eine genügend tiefe Schichtung aus, d. h. ist frei von Flüssigkeit und mit überhitztem Dampf erfüllt. Die vorliegende Arbeit berichtet über eine analytische Studie mit dem Ziel, die Höhen der verschiedenen Schichten zu ermitteln.
    Notes: Abstract The boiling process in a granular porous medium creates several different layers of the bed — a capillary layer [fixed bed], a cracked layer with horizontal cracks, and a chimney layer with vertical channels. Underneath those layers the bed becomes dry. An analysis is presented to calculate the heights of these different layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459769
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Three dimensional flow at the junction between a turbine blade and end-wall (1992)
    Springer
    Heat and mass transfer 27 (1992), S. 51-59 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Der Durchfluß auf der Saugseite und an der Endwand eines Kanals zwischen zwei benachbarten Turbinenschaufeln wird sichtbar gemacht und mit gemessenen Massen-(Wärme)strömen der selben Oberflächen verglichen. Neben den hufförmigen Wirbeln und Durchflußwirbeln werden mehrere kleinere Wirbel in der Nähe der Verbindungsstelle von Schaufel und Endwand gebildet und die Ursache ihrer Entstehung wird diskutiert. Die Wirbel lösen sich von der Endwand ab und bewegen sich über die Spannweite der Schaufel. Diese Wirbel, manchmal als gegenläufige rotierende Paare, sind für die wesentlichen lokalen Variationen des Wärmeflusses verantwortlich.
    Notes: Abstract A visualization of the flow on the suction side and end-wall of a passage between two neighboring turbine blades is compared with mass (heat) transfer measurements on the same surfaces. Besides the horseshoe and passage vortices, there are several smaller vortices formed near the junction of blade and end-wall whose origins are discussed. The vortices detach from the end-wall and move up the blade's span. These vortices, sometimes in counter rotating pairs, are responsible for substantial local variations of heat transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589977
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The near-corner mass transfer associated with turbulent flow in a square duct (1992)
    Springer
    Heat and mass transfer 27 (1992), S. 265-272 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird über den Massentransport in einer nahezu vollentwickelten turbulenten Strömung in einem Kanal mit quadratischem Querschnitt berichtet. Messungen werden an einer oder an zwei benachbarten Wänden im Bereich der sich entwickelnden Massenübergangsgrenzschicht durchgeführt. Im Bereich der Kanalecken werden Effekte der Sekundärströmung beobachtet. Diese Effekte sind anfänglich gering, wachsen jedoch weiter stromabwärts beträchtlich an. Die Lage des Maximums und seine laterale Ausbreitung werden sowohl durch die Reynoldszahl als auch durch den benachbarten Massenübergang zur Wand beeinflußt.
    Notes: Abstract Mass transfer to a nearly fully developed turbulent flow in a square duct is studied. Measurements are taken either on one or two adjacent walls in the region of a developing mass transfer boundary layer. Effects of the secondary flow on mass transfer are observed near the corners. The effects are initially small, but grow to a significant degree further downstream. The location of the maximum and its lateral spread is affected by the Reynolds number, as well as the adjacent wall mass transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589925
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Hydrodynamic instability in fluid layers with uniform volumetric energy sources (1975)
    Springer
    Flow, turbulence and combustion 31 (1975), S. 81-109 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Linear and energy theory stability criteria are presented for fluid layers of infinite horizontal extent heated internally by a uniform volumetric energy source. The thermal coupling between the layer and its environment is modeled by a general mixed boundary condition in both the conduction state and the disturbance temperature. Rigid-rigid, free-free, free-rigid, and rigid-free boundaries are considered in the computations. For a fixed ratio of upper surface Biot number to that at the lower surface, decreasing the Biot number is strictly destabilizing for both linear and energy theory criteria. A region of possible subcritical instability is found; its size is strongly dependent on Biot number and becomes small for small values of lower surface Biot number and large Biot number ratio. For two rigid surfaces and an upper and lower surface Biot number of 47.5, mean energy transport measurementswithin the convecting layer indicate a critical Reyleigh number close to that predicted by linear theory. Subcritical instability is not observed when finite amplitude disturbances are introduced at a Rayleigh number between the critical values predicted by the linear theory and the energy theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01795829
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Film cooling, mass transfer, and flow at the base of a turbine blade (1993)
    Springer
    Journal of engineering physics and thermophysics 65 (1993), S. 911-916 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of film cooling, mass transfer, and flow visualization near the endwall of a turbine blade of a fixed cascade are reviewed. Comparison of the results confirms the complex structure of the flow, including the existence of a number of interacting vortices that dominate the region. The film cooling and mass transfer variations are in correspondence with the observed flow structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00862936
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Ernst Rudol'f Georg Eckert (On his Sixty-Fifth Birthday) (1969)
    Springer
    Journal of engineering physics and thermophysics 17 (1969), S. 1045-1047 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00826589
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...