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Effects of large suction in natural convection boundary layer on a horizontal plate

Einflüsse großer Wirkung auf die Grenzschicht bei freier Konvektion an einer horizontalen Platte

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Abstract

The natural convection boundary layer on a horizontal plate with suction is investigated. The similar solutions of the boundary layer equations require suction to vary as a power law. The similarity equations have been integrated for various values of suction parameter and Prandtl number σ=0.72 and 6.8. For non-similar flow situation, a large suction approximation has been developed using the asymptotic approach. It is shown that large suction approximation is surprisingly good even for moderate values of suction parameter.

Zusammenfassung

Es wird die Grenzschicht bei freier Konvektion auf einer horizontalen Platte unter Saugwirkung untersucht. Die Ähnlichkeitslösungen der Grenzschichtgleichungen machen es erforderlich, die Saugwirkung in Form eines Exponentialansatzes zu variieren. Die Ähnlichkeitsgleichungen wurden für verschiedene Werte des Saugparameters und für Prandtl-Zahlen zwischen 0,72 und 6,8 integriert. Für nicht-ähnliche Strömungszustände wurde eine Lösung für die Saugwirkung auf der Basis der asymptotischen Näherung entwickelt. Es wird gezeigt, daß die Näherungslösung für große Saugwirkung auch erstaunlich gute Ergebnisse für geringe Werte von Saug-Parametern liefert.

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Authors and Affiliations

  1. Dept. of Mechanical Engineering Z. H. College of Engineering and Technology, Aligarh Muslim University, 209001, Aligarh, India

    N. Afzal

  2. Basin Studies Division, KDMIPE, 248195, Dehra Dun, India

    T. Hussain

Authors
  1. N. Afzal
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  2. T. Hussain
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Afzal, N., Hussain, T. Effects of large suction in natural convection boundary layer on a horizontal plate. Wärme- und Stoffübertragung 20, 203–206 (1986). https://doi.org/10.1007/BF01303451

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  • DOI: https://doi.org/10.1007/BF01303451

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