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  • 1
    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  Die zweidimensionalen instationären Navier–Stokes-und Energiegleichungen werden mittels der Finitelement-Methode für den Fall von 5 fluchtend übereinander liegenden Kreiszylindern gelöst. Die numerischen Lösungen der Grundgleichungen erfolgten über den expliziten Euler-Algorithmus, und zwar für eine Reynolds-Zahl von 100, eine Prandtl–Zahl von 0.71 und Richardson–Zahlen (Ri=Gr/Re 2) von Ri=−1.0; −0.5; 0.0; +0.5 und +1.0, jeweils für die beiden Verhältnisse Abstand/Durchmesser von 1.5 und 2.0. Stromlinien, Kurven gleicher Zirkulation, Druck- und Temperaturkonturen, lokale und mittlere Nusselt–Zahlen, Druck- und Scherspannungsverteilungen um die Zylinder werden dargestellt. Die für Zwangskonvektion (Ri=0) erhaltenen Ergebnisse stimmen gut mit zugänglichen experimentellen und numerischen Befunden überein. Auftriebseffekte sind sowohl bei förderlicher wie hemmender Anströmung von Bedeutung.
    Notes: Abstract  Two dimensional unsteady Navier–Stokes and the energy equations are solved using finite element method for the case of flow past five row deep in-line bundle of circular cylinders with pitch to diameter ratios (PDR) of 1.5 and 2.0. Numerical solutions of governing equations have been obtained using Euler’s explicit algorithm. Analysis have been made for Reynolds number of 100 and Prandtl number of 0.71. The effect of Richardson number (Ri=Gr/Re 2) on the flow and heat transfer have been investigated for Ri=−1.0, −0.5, 0.0, +0.5 and +1.0. Streamlines, isovorticity lines, pressure and temperature contours, local and average Nusselt numbers, pressure and shear stress distribution around the cylinders are presented. Results obtained for forced convection (Ri=0.0) agree well with the available experimental and numerical results. There is considerable effect of buoyancy over tube bundles both in buoyancy aiding and opposing flows.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 32 (1996), S. 81-88 
    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  Die durch Konvektionstrocknung bewirkte Temperatur- und Feuchteänderung in porösen Materialien wurde in einer eindimensionalen Analyse mittels der Methode der finiten Elemente untersucht. Unter Zugrundelegung konstanter Stoffwerte ermittelte Berechnungsergebnisse für Ziegel und Mörtel stimmen mit experimentellen Befund überein. Die Desorptionsdaten für beide Materialien wurden über die modifizierte Henderson-Gleichung ermittelt.
    Notes: Abstract  A one-dimensional finite element analysis has been carried out to study temperature and moisture variation of porous materials during convective drying. The predicted results for brick and mortar with constant transport properties agree with available experimental data. Henderson’s modified equation has been used to obtain the desorption data for the materials.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 1165-1177 
    ISSN: 0271-2091
    Keywords: Laminar flow ; Triangular step ; FEM ; Velocity correction ; 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 velocity correction algorithm is used in the finite element method to solve forced convection problems between parallel plates with a triangular step, for Reynolds numbers up to 1000. Equal-order interpolation functions for velocity, pressure and temperature are used. The solutions show a smooth variation of pressure. The streamfunction, isotherms, isobars and velocity profiles are presented for a typical Reynolds number of 500. The skin friction and heat transfer results are presented for Reynolds numbers up to 1000.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 13 (1997), S. 941-948 
    ISSN: 1069-8299
    Keywords: adaption ; Delaunay ; triangulation ; error ; unstructured mesh ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A generalized unstructured mesh generation procedure using Delaunay triangulation has been developed for adaptive finite element applications. The main features of the method include: (i) a fast and efficient initial triangulation; (ii) interior node insertion with good control over the grid size and aspect ratio distribution; (iii) a flux-based error across element boundaries. The scheme has been applied successfully to heat transfer problems involving steep temperature gradients. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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