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  • 1
    Electronic Resource
    Electronic Resource
    Flow friction on co-rotating parallel-disk assemblies with forced through-flow (1986)
    Springer
    Experiments in fluids 4 (1986), S. 56-60 
    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 power requirement for a rotating parallel-disk assembly with through-flow is experimentally studied. The flow velocity at the test core exit is measured using a traverse hot-wire probe, from which the exit kinetic energy is determined. A traverse pitot tube is utilized to monitor the velocity distribution in the inlet duct from which the flow rate is evaluated. The total pressure characteristics, fluid power transmission, rotor efficiency and moment coefficient (i.e. power number) are determined from the measurements of static pressures, rotational speed and torque. It is disclosed that the onset of stall propagation, a unique characteristics of shear pump, can be detected from a total pressure plot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316787
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal-fluid transport phenomena in strongly heated channel flows (2000)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 10 (2000), S. 802-823 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A theoretical study is performed to investigate transport phenomena in channel flows under uniform heating from either both side walls or a single side. The anisotropic t2¯- et heat-transfer model is employed to determine thermal eddy diffusivity. The governing boundary-layer equations are discretized by means of a control volume finite-difference technique and numerically solved using a marching procedure. It is found that under strong heating from both walls, laminarization occurs as in the circular tube flow case; during the laminarization process, both the velocity and temperature gradients in the vicinity of the heated walls decrease along the flow, resulting in a substantial attenuation in both the turbulent kinetic energy and the temperature variance over the entire channel cross section; both decrease causes a deterioration in heat transfer performance; and in contrast, laminarization is suppressed in the presence of one-side-heating, because turbulent kinetic energy is produced in the vicinity of the other insulated wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530010359111
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A numerical study on heat transport in turbulent Couette flows in concentric annuli (1997)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 7 (1997), S. 81-94 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical study is performed to investigate turbulent Couette flow and heat transfer characteristics in concentric annuli with a slightly heated inner cylinder moving in the flow direction. A two-equation k-e turbulence model is employed to determine the turbulent viscosity and the turbulent kinetic energy. The turbulent heat flux is expressed by Boussinesq approximation in which the eddy diffusivity for heat is given as functions of the temperature variance t2- and the dissipation rate of temperature fluctuations et, together with k and e. The governing boundary-layer equations are discretized by means of control volume finite-difference technique and numerically solved using a marching procedure. It is disclosed from the study that the streamwise movement of the inner core causes substantial reductions in the turbulent kinetic energy and the temperature variance, particularly near the inner wall region, resulting in the deterioration of the Nusselt number, and that an attenuation in heat transfer performance is induced by the velocity ratio of the moving inner cylinder to the fluid flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615539710156219
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  • 4
    Electronic Resource
    Electronic Resource
    Flow over a slot-perforated flat surface between two parallel plates (1999)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 9 (1999), S. 136-150 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A theoretical and experimental study is performed to investigate unsteady, two-dimensional, incompressible fluid flow over both sides of a slot-perforated flat surface, which is placed in a two-dimensional channel. The governing boundary-layer equations are discretized by means of a finite-difference technique to determine streamwise and transverse velocity components. The roles of both the Reynolds number and the ratio of the slot width, d, to the plate thickness, d, on the velocity field are disclosed. It is found from the study that: (i) the flow pattern between two plates can be classified into four categories depending on a combination of Re and d/d, (ii) at a small value of Re and/or d/d, flow over the slot exhibits no timewise variation, (iii) when Re and d/d exceed certain values, an alternate crossing of flow from one side of the plate to the other occurs across the slot, and (iv) a further increase in Re results in a complex flow both inside the slot and on the plate downstream of the slot. These results are confirmed by the flow visualization using ion-exchange resins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615539910256009
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  • 5
    Electronic Resource
    Electronic Resource
    Natural convection in enclosures with localized heating from below and symmetrical cooling from sides (2000)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 10 (2000), S. 518-529 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Natural convection of air in a two-dimensional, rectangular enclosure with localized heating from below and symmetrical cooling from the sides has been numerically investigated. Localized heating is simulated by a centrally located heat source on the bottom wall, and four different values of the dimensionless heat source length, 1/5, 2/5, 3/5 and 4/5 are considered. Solutions are obtained for Rayleigh number values from 103 to 106. Local results are presented in the form of streamline and isotherm plots as well as the variation of local Nusselt number on the heated wall. Finally, the average Nusselt number at the heated part of the lower wall, \overline Nu, was shown to increase with an increase the Rayleigh number, Ra, or of the nondimensional heat source thickness, e.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530010338196
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanics and correlations of flow phenomena in intersecting ducts (1994)
    Springer
    Experiments in fluids 17 (1994), S. 323-329 
    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 kinds of experiments are conducted to determine flow characteristics inside two intersecting square ducts: flow visualization by means of the dye injection, hydrogen bubble and string methods, velocity measurement using the laser Doppler anemometry, and pressure measurement using a piezometer. Angle of intersection and Reynolds number are varied. Four distinct flow regimes are disclosed: entrance, initial centrifugal, intersecting and final centrifugal regions. The geometrical dividing line in the intersection zone of the two ducts forms a flow divider separating the flow network into two independent, symmetrical flow units. Each flow unit constitutes a curved passage with a “radius of curvature” whose magnitude varies with the angle of intersection. Hence, the secondary effects prevail in each unit, resulting in complete flow mixing. The mechanisms disclosed by the flow visualization and LDA methods are supported by the quantitative results from the piezometer measurements. The string method discloses an important evidence that the intersecting zone promotes turbulence. A location of the maximum energy grade and minimum hydraulic grade is disclosed on the flow divider where the surrounding streamlines congregate and disperse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01874412
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of laminar film boiling in boundary layer flows with appreciable radiation (1969)
    Springer
    Flow, turbulence and combustion 20 (1969), S. 178-204 
    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: Summary This paper presents the theoretical study of the heat transfer and friction characteristics in the natural convection film boiling on an inclined surface and a sphere, the forced convection film boiling over a horizontal plate, and the stagnation flow film boiling when radiation is appreciable. The boiling liquid is either at the saturation temperature or subcooled. The two phase flow and heat transfer problems have been formulated exactly within the framework of boundary layer theory with the consideration of the shear stress and vapor velocity at the liquid-vapor interface. Through the use of the similarity transformation expressions are obtained to determine the vapor film thickness, skin friction, and heat transfer rate. It is disclosed that the presence of surface radiation results in an increase in the heat transfer rate and a decrease in the skin friction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00382392
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  • 8
    Electronic Resource
    Electronic Resource
    Laminar forced convection to Bingham plastic flowing through a circular tube with internal energy generation (1968)
    Springer
    Flow, turbulence and combustion 18 (1968), S. 336-352 
    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: Summary Heat transfer to a Bingham plastic in laminar tube flow with transient internal heat generation is investigated. Numerical results are obtained for the temperature response of the fluid and tube wall when subjected to step and sinusoidal variations in the heat generation rate. A resonance phenomenon is observed for the frequency response, and the Bingham plastic responds faster than a Newtonian fluid following a step in the internal heat generation. Experiments with both Newtonian fluids and slurries of aluminum in sulfuric acid show agreement with the theoretical predictions. However the effects of combined free and forced convection, as well as nonuniform dispersion of solids in a slurry, result in an axially asymmetric temperature distribution. Heat exchangers whose design is influenced by these gravity dependent phenomena include the homogeneous nuclear reactor and chemical reactors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00382358
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Cocurrent flows of two immiscible viscous fluids over a flat plate (1967)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 13 (1967), S. 396-397 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690130239
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Theoretical study of bubble dynamics in purely viscous fluids (1966)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 12 (1966), S. 927-931 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper analyzes the growth or collapse of a spherical bubble in an incompressible, viscous fluid. Theoretical results include the timewise variations in the bubble size and its growth or collapse rate, the fluid pressure, and the rate of energy dissipation. The analysis is general and may be applied to both Newtonian and non-Newtonian fluids. A comparison is given for the collapse of the bubble in several viscous fluids.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690120517
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