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  • 1
    Electronic Resource
    Electronic Resource
    Modeling of convection enhancement mechanisms (2004)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 14 (2004), S. 66-84 
    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: Most compact heat exchangers and heat dissipating components rely on convection enhancement mechanisms that reduce the continuous growth of boundary layers. Usually surface irregularities, in the form of interruptions and/or vortex generators, are introduced in the flow passages. The resulting geometric configurations are periodic in space and, after a short distance from the entrance, induce velocity and thermal fields that repeat themselves from module to module. The numerical models presented here consider the space-periodicity and allow flows that are stationary at sub-critical values of the Reynolds number, but become time-periodic, or quasi periodic, above the critical value of the Reynolds number. Space discretizations are achieved by an equal order finite element procedure based on a projection algorithm. Two-dimensional schematizations are employed to analyze the effects of surface interruptions and transverse vortex generators, while three-dimensional schematizations are employed for longitudinal vortex generators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530410511630
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  • 2
    Electronic Resource
    Electronic Resource
    Three-dimensional flows over backward facing s.tif (1999)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 9 (1999), S. 224-240 
    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: Three-dimensional flows over backward facing s.tif are analysed by means of a finite element procedure, which shares many features with the SIMPLER method. In fact, given an initial or guessed velocity field, the pseudovelocities, i.e. the velocities that would prevail in the absence of the pressure field, are found first. Then, by enforcing continuity on the pseudovelocity field, the tentative pressure is estimated, and the momentum equations are solved in sequence for velocity components. Afterwards, continuity is enforced again to find corrections that are used to modify the velocity field and the estimated pressure field. Finally, whenever necessary, the energy equation is solved before moving to the next step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/EUM0000000004563
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  • 3
    Electronic Resource
    Electronic Resource
    Convective heat transfer in ribbed square channels (2002)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 12 (2002), S. 610-628 
    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: Three-dimensional laminar forced convective heat transfer in ribbed square channels is investigated. In these channels, transverse and angled ribs are placed on one or two of the walls to form a repetitive geometry. After a short distance from the entrance, also the flow and the dimensionless thermal fields repeat themselves from module to module allowing the assumption of periodic, or anti-periodic, conditions at the inlet/outlet sections of the calculation cell. Prescribed temperature boundary conditions are assumed at all solid walls, including the ribs. Pressure drop and heat transfer characteristics are compared for rib angles ranging from 90° (transverse ribs) to 45°, and different values of the Reynolds number. The influence of rib geometries is investigated below and above the onset of the self-sustained flow oscillations that precede the transition to turbulence. Numerical simulations are carried out employing an equal order finite-element procedure based on a projection algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530210434313
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  • 4
    Electronic Resource
    Electronic Resource
    Convective heat and mass transfer in wavy finned-tube exchangers (2002)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 12 (2002), S. 735-755 
    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: The paper adopts a simplified two-dimensional approach to deal with convective heat and mass transfer in laminar flows of humid air through wavy finned-tube exchangers. The computational domain is spatially periodic, with fully developed conditions prevailing at a certain distance from the inlet section. Both the entrance and the fully developed flow region are investigated. In the fully developed region, periodicities in the flow, temperature and mass concentration fields are taken into account. The approach is completely general, even if the finite element method is used for the discretizations. In the application section, velocity, temperature, and mass concentration fields are computed first. Then apparent friction factors, Nusselt numbers, Colburn factors for heat and mass transfer, and goodness factors are evaluated both in the entrance and in the fully developed region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530210438373
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of space ratio and corrugation angle on convection enhancement in wavy channels (2003)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 13 (2003), S. 500-519 
    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: By neglecting the influence of tubes, this paper adopts a simplified two-dimensional approach to deal with laminar convection of air through wavy finned-tube exchangers. Pressure drop and heat transfer characteristics are investigated in the fully developed region of the flow channels between adjacent fins. The solutions are presented for several space ratios (height over length of a module) and two corrugation angles. They concern laminar flows both below and above the onset of the self-sustained oscillations that precede the transition to turbulence. Fully developed velocity and thermal fields are computed by imposing anti-periodic conditions at inlet/outlet sections of a single calculation cell. In the range of Reynolds numbers investigated, Nusselt numbers and friction factors first increase with space ratios (up to a value depending on the corrugation angle), then start decreasing with increasing space ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530310475939
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    FINITE ELEMENT ANALYSIS OF FREEZING PROCESSES IN FOODSTUFFS (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Finite element analysis concerning freezing processes of interest to food engineering allows the solution of practically any phase-change problem described in terms of two-dimensional geometries. Special features of the program used include isoparametric elements, control of numerical oscillations and an accurate procedure for the estimation of thermal properties. In the examples of applications presented in the paper, reference is made to air-blast freezing of foodstuffs having irregular shapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb09781.x
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  • 7
    Electronic Resource
    Electronic Resource
    Use of the finite-element method in problems of heat and mass transfer in porous bodies (1975)
    Springer
    Journal of engineering physics and thermophysics 29 (1975), S. 1154-1159 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-dimensional isoparametric finite elements are used to solve problems of heat and mass transfer in porous bodies. A comparison of the numerical calculations with the analytic solutions of one-dimensional problems shows a very good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00861213
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  • 8
    Electronic Resource
    Electronic Resource
    Finite element solution of the streamfunction-vorticity equations for incompressible two-dimensional flows (1994)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 19 (1994), S. 513-525 
    Details
    ISSN: 0271-2091
    Keywords: Finite elements ; Incompressible viscous flow ; Streamfunction-vorticity ; Vorticity boundary conditions ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The streamfunction-vorticity equations for incompressible two-dimensional flows are uncoupled and solved in sequence by the finite element method. The vorticity at no-slip boundaries is evaluated in the framework of the streamfunction equation. The resulting scheme achieves convergence, even for very high values of the Reynolds number, without the traditional need for upwinding. The stability and accuracy of the approach are demonstrated by the solution of two well-known benchmark problems: flow in a lid-driven cavity at Re ≤ 10,000 and flow over a backward-facing step at Re = 800.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650190605
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Finite element solution of non-linear heat conduction problems with special reference to phase change (1974)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 8 (1974), S. 613-624 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents a generally applicable approach to transient heat conduction problems with non-linear physical properties and boundary conditions. An unconditionally stable central algorithm is used which does not require iteration.Several examples involving phase change (where latent heat effects are incorporated as heat capacity variations) and non-linear radiation boundary conditions are given which show very good accuracy.Simple triangular elements are used throughout but the formulation is generally valid and not restricted to any single type of element.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620080314
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Drying-induced stresses in porous bodies (1977)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 11 (1977), S. 1175-1184 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620110711
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