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  • 1
    Digitale Medien
    Digitale Medien
    Investigations of mean and turbulent flow characteristics of a two dimensional plane diffuser (1991)
    Springer
    Experiments in fluids 10 (1991), S. 205-212 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract This paper reports the investigation of mean and turbulent flow characteristics of a two-dimensional plane diffuser. Both experimental and theoretical details are considered. The experimental investigation consists of the measurement of mean velocity profiles, wall static pressure and turbulence stresses. Theoretical study involves the prediction of downstream velocity profiles and the distribution of turbulence kinetic energy using a well tested finite difference procedure. Two models, viz., Prandtl's mixing length hypothesis and k-ɛ model of turbulence, have been used and compared. The nondimensional static pressure distribution, the longitudinal pressure gradient, the pressure recovery coefficient, percentage recovery of static pressure, the variation of U max/U bar along the length of the diffuser and the blockage factor have been valuated from the predicted results and compared with the experimental data. Further, the predicted and the measured value of kinetic energy of turbulence have also been compared. It is seen that for the prediction of mean flow characteristics and to evaluate the performance of the diffuser, a simple turbulence model like Prandtl's mixing length hypothesis is quite adequate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00190390
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Transient natural convection along vertical cylinder with Heat and Mass transfer (1998)
    Springer
    Heat and mass transfer 33 (1998), S. 449-455 
    Details
    ISSN: 1432-1181
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract A numerical solution for the transient natural convection flow over a vertical cylinder under the combined buoyancy effect of heat and mass transfer is presented. The velocity, temperature and concentration profiles, local and average skin-friction, Nusselt number and Sherwood number are shown graphically. It is observed that time taken to reach steady state increases with Schmidt number and decreases as combined buoyancy ratio parameter N increases. Stability and convergence of the finite difference scheme are established.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002310050214
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Unsteady free convection on a vertical cylinder with variable heat and mass flux (1999)
    Springer
    Heat and mass transfer 35 (1999), S. 259-265 
    Details
    ISSN: 1432-1181
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The unsteady natural convection boundary layer flow over a semi-infinite vertical cylinder is considered with combined buoyancy force effects, for the situation in which the surface temperature T ′ w(x) and C ′ w(x) are subjected to the power-law surface heat and mass flux as K(T ′/r) = −ax n and D(C ′/r) = −bx m . The governing equations are solved by an implicit finite difference scheme of Crank-Nicolson method. Numerical results are obtained for different values of Prandtl number, Schmidt number ‘n’ and ‘m’. The velocity, temperature and concentration profiles, local and average skin-friction, Nusselt and Sherwood numbers are shown graphically. The local Nusselt and Sherwood number of the present study are compared with the available result and a good agreement is found to exist.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002310050322
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Unsteady flow past an impulsively started vertical plate with heat and mass transfer (1998)
    Springer
    Heat and mass transfer 34 (1998), S. 187-193 
    Details
    ISSN: 1432-1181
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Finite difference solution of the transient free-convection flow of an incompressible viscous fluid past an impulsively started semi-infinite vertical plate with heat and mass transfer is presented here. The steady state velocity, temperature and concentration profiles are shown graphically. Velocity profiles are compared with exact solution. It has been observed that there is a rise in the velocity due to the presence of a mass diffusion. An increase in Schmidt number, leads to a fall in the velocity. Stability and the convergence of the finite difference scheme are established.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002310050248
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  • 5
    Digitale Medien
    Digitale Medien
    Flow past an impulsively started vertical plate with variable surface temperature and mass flux (1999)
    Springer
    Heat and mass transfer 34 (1999), S. 487-493 
    Details
    ISSN: 1432-1181
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Finite-difference solution of the transient natural convection flow of an incompressible viscous fluid past an impulsively started semi-infinite vertical plate with variable surface temperature and mass flux is presented here. The Velocity profiles are compared with exact solution and are found to be in good agreement. The steady-state velocity, temperature and concentration profiles are shown graphically. It is observed that there is a rise in the velocity due to the presence of a mass diffusion. The local as well as average skin-friction, Nusselt number and Sherwood number are shown graphically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002310050286
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  • 6
    Digitale Medien
    Digitale Medien
    Aerodynamic flow investigations in an isothermal model of an afterburner (1994)
    Springer
    Experiments in fluids 17 (1994), S. 59-67 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Experimental and numerical investigations of the three-dimensional flowfields in an isothermal model of an afterburner are presented. Five-hole pilot probe measurements along the entire length of the model in three different azimuthal planes, allow the determination of three mean velocity components which provide comprehensive information to aid understanding of such complex flows. The numerical calculations are performed using a SIMPLE based algorithm with staggered grid arrangement. The standardk-ɛ model is used for physical modeling. The numerical results agree quite satisfactorily with the time-mean velocity measurements. The predicted turbulence kinetic energy contours have also been presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02412804
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  • 7
    Digitale Medien
    Digitale Medien
    Turbulent flow inside the cylinder of a Diesel engine — an experimental investigation using hot wire anemometer (1990)
    Springer
    Experiments in fluids 9 (1990), S. 167-174 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract This paper describes the measurement of mean velocity and turbulence intensity using hot-wire anemometry inside the cylinder of a Diesel engine under motoring (non-firing) conditions. The effects of engine speed and compression ratio on mean velocity and turbulence intensity have been studied. In addition, turbulence scales have also been evaluated using auto-correlation function and power spectrum which are obtained from fluctuating velocity. The measurements were carried out at 4 different locations inside the piston cavity. Mean velocity and turbulence intensity are found to increase with speed. Increase in compression ratio has significantly increased the mean velocity at all crank angles. The main feature of this investigation is that the experiments have been conducted at higher compression ratios and a relatively high speed using a single high temperature straight wire probe.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00187418
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  • 8
    Digitale Medien
    Digitale Medien
    An experimental investigation of flow parameters inside a spherical swirl pre-chamber of a diesel engine under motoring condition (1998)
    Springer
    Experiments in fluids 24 (1998), S. 462-469 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract  The main aim of the present investigation is to experimentally study the flow parameters inside a spherical combustion chamber of an indirect injection diesel engine. For this a spherical chamber has been fitted in the cylinder head. Using a constant temperature hot-wire anemometer, measurements have been made under non-firing condition at 400 and 500 rpm during compression stroke. Mean velocity and turbulence intensity values are evaluated from the hot-wire signal. Measurements are made at three axial planes, six angular locations and four radial positions. Large variations of mean velocity and turbulence intensity have been observed within the chamber. From the measurements, the mean velocity and turbulence intensity are found to be maximum at 30° before compression TDC and these values are found to decrease towards the centre of the pre-chamber. The mean velocity and turbulence intensity distribution with respect to various locations and crank angles are presented and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003480050195
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  • 9
    Digitale Medien
    Digitale Medien
    An investigation on spacing of cracks and maximum crackwidth in reinforced concrete flexural members (1985)
    Springer
    Materials and structures 18 (1985), S. 123-133 
    Details
    ISSN: 1359-5997
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung
    Beschreibung / Inhaltsverzeichnis: Résumé On propose une méthode de détermination de l'espacement des fissures et de leur largeur maximale dans des éléments de béton armé travaillant en flexion. On détermine les constantes de la méthode proposée à partir d'une analyse statistique des résultats d'essai de Hognestad, Clark et Baseet al. On compare les valeurs expérimentales de largeur des fissures d'après les équations fournies par CP 110, le Code Modèle, Gergely et Lutz, on discute la méthode proposée et les résultats.
    Notizen: Abstract A method is proposed to determine the crack spacing and maximum crackwidth in reinforced concrete flexural members. The constants appearing in the proposed method are determined from a statistical analysis of the the test results of Hognestad, Clark and Baseet al. Experimental crackwidth values are compared with the crackwidth values computed from the equations given by CP110, Model Code, Gergely and Lutz and the proposed method and the results are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02473379
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  • 10
    Digitale Medien
    Digitale Medien
    Citrinin, a phytotoxin? (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1415-1417 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Observations from preliminary experiments to discover the phytotoxicity, if any, of the fungal metabolite, citrinin, are presented. There seems to be a positive indication, warranting further investigation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01923219
    Standort Signatur Erwartet Verfügbarkeit
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