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  • 1
    Electronic Resource
    Electronic Resource
    Forced convection from a straight elliptical tube (1998)
    Springer
    Heat and mass transfer 34 (1998), S. 229-236 
    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
    Notes: Abstract The paper deals with the problem of two-dimensional laminar forced convection heat transfer from a straight isothermal tube of elliptic cross-section placed in a uniform stream. The study is based on numerical solutions of the conservation equations of mass, momentum, and energy which covers the entire flow domain including the wake region. The parameters influencing the heat transfer process are essentially the Reynolds number, Re, the tube geometry represented by its minor to major axis ratio, Ar, and the angle of inclination, λ. The study focuses on the effect of Re, Ar, and λ on the heat transfer process in the range of Re from 20 to 500. The study reveals that the rate of heat transfer reaches its maximum when λ=0∘ while the minimum occurs when λ=90∘. The results also show that smaller axis ratio gives higher heat transfer rate when λ=0∘. The local Nusselt number and surface vorticity distributions are plotted for a number of cases and the effect of vortex shedding on the overall rate of heat transfer is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050254
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  • 2
    Electronic Resource
    Electronic Resource
    Heat convection from a cylinder performing steady rotation or rotary oscillation – Part I: Steady rotation (1999)
    Springer
    Heat and mass transfer 34 (1999), S. 365-373 
    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
    Notes: Abstract In this paper, the problem of laminar, two dimensional heat convection from a circular cylinder performing steady rotation is investigated. The cylinder is␣placed with its axis horizontal in a quiescent fluid of infinite extent. Because of viscous dissipation, the flow process is confined to the region adjacent to the cylinder and is mainly driven by shear and buoyancy forces. The study is based on the solution of the full conservation equations of mass, momentum and energy for Rayleigh numbers up to 104 and Reynolds numbers (based on surface velocity) up to 400 while Prandtl number ranges between 0.7 and 7.0. For the range of parameters considered, the study revealed that the rate of heat transfer increases with the increase of Rayleigh number and decreases with the increase of speed of rotation. The increase of Prandtl number resulted in an appreciable increase in the average Nusselt number only at low Reynolds numbers. The effect of Prandtl number at high Reynolds number is negligibly small. The resulting flow field in all cases is steady with no vortex shedding. The streamlines and isotherms are plotted for a number of cases to show the details of the velocity and thermal fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050271
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Heat convection from a cylinder performing steady rotation or rotary oscillation – Part II: Rotary oscillation (1999)
    Springer
    Heat and mass transfer 34 (1999), S. 375-380 
    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
    Notes: Abstract This paper deals with the problem of combined (forced and natural) convection from a horizontal cylinder performing oscillating rotary motion in a quiescent fluid of infinite extent. While forced convection is caused by cylinder oscillation, the natural convection is caused by the buoyancy driven flow. The heat transfer process is governed by Rayleigh number, Ra, Reynolds number, Re, and the dimensionless frequency of oscillation, S. The study covers Ra up to 103, Re up to 400 and S up to 0.8. The results showed that, for the same Ra, the time-averaged rate of heat transfer lies in between two limiting values. The first, is the steady state heat rate due to natural convection from a fixed cylinder and the second is the steady state heat rate from a cylinder rotating steadily at a speed equal to the maximum speed of rotational oscillation. The smaller the value of Re the nearer the time-averaged Nusselt number to that of fixed cylinder at the same Ra and the higher Re the lower the average Nusselt number. The effect of frequency is only limited to changing the amplitude of the fluctuating Nusselt number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050272
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  • 4
    Electronic Resource
    Electronic Resource
    Viscous flow over a sphere with fluctuations in the free-stream velocity (2000)
    Springer
    Computational mechanics 26 (2000), S. 409-418 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The problem of viscous flow over a sphere with fluctuations in the free-stream velocity is considered. The governing conservation equations are expressed terms of the stream function and vorticity and solved using the series truncation method where the stream function and vorticity are approximated using finite series of Legendre and first associated Legendre functions. The effects of the Reynolds number, Strouhal number, and the amplitude of the fluctuations on the flow characteristics are studied. Results are presented for periodic variation of the drag coefficient, surface vorticity and pressure distributions for Reynolds numbers ranging from 5 to 100, Strouhal numbers ranging from π/4 to π, and amplitude of fluctuations from 0.0 to 0.5. The time variation of the velocity field during one complete cycle is presented in the form of streamline and equi-vorticity patterns. The periodic variation of the angle of separation as well as the length of the separation region are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660000185
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  • 5
    Electronic Resource
    Electronic Resource
    The initial oscillatory flow past a circular cylinder (1995)
    Springer
    Journal of engineering mathematics 29 (1995), S. 255-269 
    Details
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract This paper presents results obtained from an initial approximation for the flow around a circular cylinder in two-dimensional oscillating flow. The analysis is developed in terms of the scalar vorticity and stream function. An expansion in powers of time from the start of the motion is obtained using an exact analysis which extends the results of boundary-layer theory by taking into account corrections for finite Reynolds number. The time development of the physical properties of the flow are determined both by means of analytical expressions and by an accurate numerical procedure. The surface pressure, drag and surface vorticity are calculated and various estimates of the time of separation and the distance moved in this time are obtained. The phenomenon of steady streaming is not considered in this paper since the time of validity of the expansions is small. The agreement between the analytical and numerical results at small times is excellent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042857
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Oscillating flow over oblate spheroids (1999)
    Springer
    Acta mechanica 137 (1999), S. 237-254 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper deals with the problem of oscillating viscous flow over an oblate spheriod. The flow is assumed incompressible and axisymmetric and the motion is governed by the Navier-Stokes equations. The method of solution is based on the series truncation method where the stream function and vorticity are expressed in terms of a finite series of Legendre functions. The effects of the Reynolds and Strouhal numbers on the flow characteristics are studied and compared with previous available solutions. Results are presented for the periodic variation of the drag coefficient, surface vorticity and pressure distributions for Reynolds numbers ranging from 5 to 100 and Strouhal numbers ranging from π/4 to π while keeping the spheroid axis ratio unchanged. The time variation of the velocity field during one complete oscillation is presented in the form of streamline and equi-vorticity patterns. The periodic variation of the angle of separation as well as the length of the separation bubble are also presented. The double boundary layer structure previously observed in the case of a sphere is also detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179212
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  • 7
    Electronic Resource
    Electronic Resource
    The impulsively started flow over oblate spheroids (1999)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 50 (1999), S. 193-205 
    Details
    ISSN: 0044-2275
    Keywords: Key words. Oblate spheroid, impulsive flow, flow separation, wake flow, vortex motion.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract. The problem of the impulsively started flow over an oblate spheroid is solved using the series truncation method in which the stream function and vorticity are expanded in terms of series of Legendre functions. The resulting time-dependent differential equations are solved using the Crank-Nicolson finite difference scheme. The parameters involved are the Reynolds number and the axis ratio. The range of Reynolds numbers considered is from 5 to 100 while the axis ratio is considered at values of A r = 0.6 and 0.76. The time variation of the flow field is presented in the form of streamline and equi-vorticity patterns as well as pressure and surface vorticity distributions. The time development of the separation angle, wake length, and the frictional and total drag coefficients are also presented. The large time (steady) values of the drag coefficient for the special case of a sphere are compared with previously known data and the agreement is satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000330050146
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  • 8
    Electronic Resource
    Electronic Resource
    On the effect of flow direction on mixed convection from a horizontal cylinder (1985)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 5 (1985), S. 1-12 
    Details
    ISSN: 0271-2091
    Keywords: 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 influence of free stream direction on mixed (natural and forced) convective heat transfer from a circular cylinder is investigated. The cylinder, which has an isothermal surface, is placed with its axis horizontal and normal to the oncoming flow. The free stream direction varies between the vertically upward (parallel flow) and the vertically downward (contraflow) directions. The investigation is based on the time integration of the unsteady, two-dimensional equations of motion and energy until reaching steady conditions. The study is limited to Reynolds numbers up to Re = 40 and Grashoff numbers of Gr = Re2. The results are compared with the available experimental data and the agreement is satisfactory.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650050102
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    Paper (German National Licenses)
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