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Flow visualization studies of free convection laminar-to-turbulent transition along a heated vertical plate in water induced by two-dimensional forced disturbances

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Abstract

Visual investigations have been made of threedimensional transition phenomena in the boundary layer along a vertical heated plate in water in free convection under controlled forced disturbances. Regions of intense shear as well as longitudinal vorticity have been noted in the course of the amplification of the Tollmien-Schlichting disturbance waves. In the outer region of the boundary layer longitudinal vortices were observed, occurring relatively early. In their amplification and decay process they rapidly destroy the regularity of the inflow to the boundary layer and indirectly affect the transition development nearer to the wall.

Zusammenfassung

An einer vertikalen geheizten Platte in Wasser wurden die bei freier Konvektion auftretenden dreidimensionalen Umschlagvorgänge in der Grenzschicht bei gesteuerten, erzwungenen Störungen sichtbar gemacht und untersucht. Im Laufe der Anfachung der Tollmien-Schlichting-Störwellen traten Gebiete intensiver Scherspannung und longitudinaler Wirbelstärkekonzentration auf. In der äußeren Zone der Grenzschicht zeigten sich relativ früh Längswirbel. Im Verlauf ihrer Anfachung und ihres weiteren Zerfalls zerstörten sie rasch die Regelmäßigkeit der Einströmung in die Grenzschicht. Dadurch beeinflußten sie indirekt die weitere Entwicklung des Umschlags in Wandnähe.

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Authors and Affiliations

  1. Institut für Angewandte Mathematik und Mechanik der DFVLR, Hebelstraße 27, 78 Freiburg i.Br., Germany

    P. Čolak-Antić &  H. Görtler

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  1. P. Čolak-Antić
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  2. H. Görtler
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Additional information

Dedicated to Professor Dr.Klaus Oswatitsch on the occasion of his 60th birthday.

This research, conducted at the DFVLR-Institute in Freiburg, has additionally been supported by grants and loan of instrumentation by the Deutsche Forschungsgemeinschaft.

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Čolak-Antić, P., Görtler, H. Flow visualization studies of free convection laminar-to-turbulent transition along a heated vertical plate in water induced by two-dimensional forced disturbances. Warme- und Stoffubertragung 4, 25–31 (1971). https://doi.org/10.1007/BF01002759

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  • DOI: https://doi.org/10.1007/BF01002759

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