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  • 1
    Electronic Resource
    Electronic Resource
    The effect of velocity distribution on forced convection laminar flow heat transfer in a pipe at constant wall temperature (1970)
    Springer
    Heat and mass transfer 3 (1970), S. 227-231 
    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
    Description / Table of Contents: Zusammenfassung Es handelt sich um eine theoretische Untersuchung des Wärmeübergangs in laminarer Rohrströmung bei verschwindender Viskosität. Zum Vergleich mit anderen klassischen Lösungen wurde konstante Wandtemperatur als Randbedingung vorgegeben. Unter Benutzung von Geschwindigkeitsprofilen einfacher Geometrie wurde deren Einfluß auf den Wärmeübergang ermittelt. Diese Ergebnisse sind wegen der gewählten Strömungs- und Wärmeübergangsmodelle auf alle achsensymmetrischen Strömungen anwendbar. Die mögliche Wirkung einer Wirbelströmung auf den Wärmeübergang wird diskutiert.
    Notes: Abstract In this paper, a theoretical study of heat transfer to a fluid of vanishing viscosity in laminar flow in a pipe is made. The constant wall temperature boundary condition is considered in order to facilitate comparison with other classical solutions. Using velocity profiles of simple geometrical shape, the dependence of the heat transfer on velocity distribution is illustrated. Because of the nature of the idealised flow and heat transfer models, the theoretical results are applicable to all axisymmetric flows. Accordingly, some account of the possible effects of swirl on heat transfer in real flows is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106720
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow (1972)
    Springer
    Heat and mass transfer 5 (1972), S. 127-133 
    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
    Description / Table of Contents: Zusammenfassung Diese Arbeit behandelt Versuche über Mischkonvektion in einer zweidimensionalen Wasserströmung mit unsymmetrischer Beheizung. Zur Prüfung der Apparatur wurden auch Versuche im vollturbulenten Bereich (Remax =9000) durchgeführt. Zur Messung örtlicher Nusselt-Zahlen bei laminarer Mischkonvektion wurde die Reynolds-Zahl von 100 bis 1000 variiert bei Rayleigh-Zahlen zwischen 10 und 300 entsprechend dem jeweiligen Wärmestrom. Die graphisch wiedergegebenen Ergebnisse wurden mit theoretischen Werten anderer Autoren verglichen. Der Auftrieb hatte unmittelbar am Eintritt [(x/de)/Re Pr 〈0,05] keinen meßbaren Einfluß, jedoch stieg der Wärmeübergang bei größeren Abständen beträchtlich an mit höheren Rayleigh-Zahlen.
    Notes: Abstract An experimental study of mixed convection in an asymmetrically heated two-dimensional flow of water has been made. Experiments in fully developed turbulent flow (Re maximum=9000) were made initially to establish the satisfactory operation of the equipment. In the mixed convection laminar flow tests to determine local Nusselt numbers, the Reynolds number range was from about 100 to 1000 with the Rayleigh number based on heat flux varying from about 10 to 300. The data, which are presented graphically, have been compared with the results of the theoretical analyses of other workers. The effect of buoyancy in the immediate entry of the flow [(x/de)/Re Pr 〈.05] was found to be negligible, but at greater distances there were significant increases in the heat transfer coefficient with the larger values of Rayleigh number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438414
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  • 3
    Electronic Resource
    Electronic Resource
    A experimental investigation of turbulent flow and heat transfer in elliptical duets (1973)
    Springer
    Heat and mass transfer 6 (1973), S. 101-107 
    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
    Description / Table of Contents: Zusammenfassung Voll entwickelte turbulente Strömung und Wärmeübertragung an Luft und Wasser in elliptischen Kanälen wurden experimentell untersucht. Für Kanäle mit Achsenverhältnissen von 2,5 ∶ 1 und größer fand man eine Verringerung des Wärmedurchgangs im Bereich geringer Reynolds-Zahlen (Re 〈 25 000). Ähnliche Effekte waren von anderen Autoren in engen Dreieckskanälen gefunden worden, wobei man aus Strömungsmessungen das gleichzeitige Auftreten von laminarer und turbulenter Strömung mit örtlicher Zunahme des thermischen Widerstandes folgern konnte. Die Analogie zwischen Impuls- und Wärmeübertragung konnte nicht unmittelbar auf Kanäle mit großem Achsenverhältnis, bei denen die Umfangstemperatur beträchtlich variierte, angewendet werden.
    Notes: Abstract Fully developed turbulent flow and heat transfer to air and water in ducts of elliptical cross section have been investigated experimentally. For the ducts of aspect ratio 2.5 ∶ 1 and larger, a reduction in the overall heat transfer rate was found in the lower turbulent Reynold's number range (Re〈25,000). Similar effects have been noted by investigators of narrow triangular cross sections where flow measurements indicated the possible co-existence of laminar and turbulent flow resulting in localised increases in thermal resistance. It was found that the analogy between momentum and heat transfer could not be applied directly to the larger aspect ratio ducts where significant circumferential variations of wall temperature occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01817975
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  • 4
    Electronic Resource
    Electronic Resource
    A mixing length model for turbulent flow in constant cross section ducts (1977)
    Springer
    Heat and mass transfer 10 (1977), S. 125-129 
    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
    Description / Table of Contents: Zusammenfassung In dieser Arbeit wurde der dämpfende Wandeinfluß in turbulenten Strömungen untersucht. Unter Berücksichtigung der Schwingungen in der gesamten Grenzschicht wurde die ursprüngliche Theorie von van Driest erweitert und ein Dämpfungsfaktor an der Wand in Rohrströmungen mit konstantem Querschnitt ermittelt. Dieser Dämpfungsfaktor diente in Verbindung mit Ausdrücken für die Mischungslänge zur Bestimmung des Geschwindigkeitsfeldes. Ausgewählte Beispiele waren die ebene Parallelströmung sowie die Zylinderströmung in einem Rohr und einem Ringspalt.
    Notes: Abstract In this paper, a study is made of the damping influence of the wall on turbulent fluid flow. By considering the oscillation of the whole of the boundary, van Driest's original hypothesis has been extended to obtain the wall damping factor in flow in a duct of constant cross section. The damping factor is used in conjunction with mixing length expressions to obtain the velocity field. Particular examples considered are plane parallel flow and axisymmetric flow in a pipe and in an annulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682705
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  • 5
    Electronic Resource
    Electronic Resource
    An observation on the origin of secondary flow in straight noncircular ducts (1983)
    Springer
    Heat and mass transfer 17 (1983), S. 93-95 
    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
    Description / Table of Contents: Zusammenfassung Diese Mitteilung behandelt die Entstehung der Sekundärströmung in geraden, nichtkreisförmigen Kanälen. Eine kritische Untersuchung der analytischen Ausdrücke für die Erzeugung der Sekundärströmung zeigt, daß die wesentliche Voraussetzung ein endlicher Gradient der Differenz der turbulenten Spannungen in der Ebene des Kanalquerschnitts in Umfangsrichtung ist. Das folgt aus einer Untersuchung der Verteilung der turbulenten Spannungen der Rohrströmung einheitlicher Richtung und setzt voraus, daß im allgemeinen nur die Normalspannungen für die Erzeugung der Sekundärströmung maßgebend sind. Eine Bemerkung bezieht sich auf die „vorticity reversal“ in unmittelbarer Wandnähe eines nichtkreisförmigen Kanals.
    Notes: Abstract This note is concerned with the origin of secondary flow in straight noncircular ducts. A critical examination of the analytical expressions for the secondary flow production terms is made to show that the essential requirement for secondary flow is a finite gradient of the difference in the turbulent stresses in the plane of the duct cross section in a peripheral direction. This conclusion has been reached following an investigation of the turbulent stress distributions in unidirectional pipe flow and assumes that, in general, the normal stresses only are significant in secondary flow production. An observation is made on “vorticity reversal” in the immediate vicinity of the boundary of a noncircular duct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01007224
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  • 6
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    A mixing length model for turbulent flow in constant cross section ducts (1977)
    Springer
    Details
    Publication Date: 1977-06-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 7
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    Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow (1972)
    Springer
    Details
    Publication Date: 1972-06-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 8
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    The effect of velocity distribution on forced convection laminar flow heat transfer in a pipe at constant wall temperature (1970)
    Springer
    Details
    Publication Date: 1970-12-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 9
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    An observation on the origin of secondary flow in straight noncircular ducts (1983)
    Springer
    Details
    Publication Date: 1983-06-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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    A experimental investigation of turbulent flow and heat transfer in elliptical duets (1973)
    Springer
    Details
    Publication Date: 1973-06-01
    Print ISSN: 0042-9929
    Electronic ISSN: 1432-1181
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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