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On Heat Transfer by Superimposition of a Creeping Flow of a Fluid with its Stationary Free Convection

  • G. Appel
  • V. Lippig
  • D. Straub
  • R. Waibel

Summary

Under special circumstances heat energy has to be transferred from a bundle of parallelly arranged finned cylindrical pipes to a fluid coolant, which can be moved only in a creeping flow between the heated pipes in the direction of the cylinder axes.

The experimental and theoretical results presented here demonstrate that, by stationary heat transfer and an increasing mass flow of coolant, the effective mean temperature difference at first weakly increases behind a characteristic minimum, then reaches a pronounced maximum and finally decreases asymptotically towards zero in a high coolant mass flow. This behaviour offers the possibility of transferring large rates of heat with small amounts of coolant, an application which has, for example, increasingly interesting ecological aspects.

Keywords

Heat Transfer Heat Transfer Coefficient Heat Exchanger Free Convection Local Heat Transfer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    G.F. Jackson and T.A. Williams: The effect of buoyancy on heat transfer in a bundle of roughened rods at low forced flow. Nato Advanced Study Institute, Ankara, 1981 in: S. KakaC̀, R.K. Shah and A.E. Bergles (eds): Low Reynolds Number Flow Heat Exchangers Hemisphere Publ. Corp., New York, 1982 (to be published)Google Scholar
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    G. Appel, E. Oswald and D. Straub: Theoretische und experimentelle Untersuchungen zur Wärmeübertragung durch Freie Konvektion in einem GWR-Wärmeübertrager. Interner Arbeitsbericht des Instituts für Thermodynamik der HSBwM München, 1982Google Scholar
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    U. Grigull, H. Sandner: Wärmeleitung Springer-Verlag, Berlin, Heidelberg, New York, 1979MATHGoogle Scholar
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    E.R.G. Eckert: Einführung in den Wärme- und Stoffaustausch, 3. Auflage Springer-Verlag, Berlin, Heidelberg, New York, 1966Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1982

Authors and Affiliations

  • G. Appel
    • 1
  • V. Lippig
    • 1
  • D. Straub
    • 1
  • R. Waibel
    • 1
  1. 1.Institut für Thermodynamik im Fachbereich Luft- und RaumfahrttechnikHochschule der Bundeswehr MünchenNeubibergGermany

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