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Non-similar solutions of free convection flow over a vertical frustum of a cone for constant wall temperature

Nichtähnlichkeits-Lösnngen für die freie Konvektionsströmung an einem vertikalen Kegelstumpf bei konstanter Wandtemperatur

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Summary

The laminar free convection flow and heat transfer over a vertical frustum of a cone is studied. The governing boundary layer equations are solved using local non-similarity method for constant wall temperature case. Local similarity and the local non-similarity two- and three-equation models are constructed and the resulting equations are solved numerically. Results obtained from two- and three-equation models are in good agreement. The numerical values of the flow and temperature functions required to calculate the surface skin friction and heat transfer rate have been reported for various values of Prandtl numbers.

Übersicht

Untersucht wird die laminare freie Konvektionsströmung und der Wärmeübergang an einem vertikalen Kegelstumpf. Zur Lösung der zugehörigen Grenzschichtgleichungen im Fall konstanter Wandtemperatur werden die Modelle der lokalen Ähnlichkeit und der lokalen Nichtähnlichkeit mit zwei bzw. drei Gleichungen eingeführt und die sich ergebenden Gleichungen numerisch gelöst. Die Lösungen nach den Modellen mit zwei und drei Gleichungen passen gut zusammen. Die Zahlenwerte von Strom- und Temperaturfunktionen, die für die Berechnung der Wandschubspannung und der Wärmeübergangsrate benötigt werden, sind für verschiedene Werte der Prandtl-Zahl angegeben.

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Singh, P., Radhakrishnan, V. & Narayan, K.A. Non-similar solutions of free convection flow over a vertical frustum of a cone for constant wall temperature. Ing. arch 59, 382–389 (1989). https://doi.org/10.1007/BF00534068

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