Transient laminar-turbulent transition of thermal boundary layer after the change of incidence angle

• Autorzy: Wierciński Z. , Kaiser M.
• Języki publikacji: EN

Abstrakty

EN

Convective heat transfer problems occur in many technical application. Unsteady transition in the heated boundary layer is one of them. Heat transfer investigation of a flat plate in a low subsonic wind tunnel for flow velocity Uo=15 and 20 m/s was performed. The changes in time of the Stanton number distribution along the plate were observed after the incidence angle had been changed from - 0.8 to 0°. While for the incidence angle i= -0.8° the flow in boundary layer was laminar, for angle -0.67#176 the transition was observed, and for the angle -0.23° the flow was turbulent. After the sudden change of angle the transient bahaviour of the heat transfer between these three states were observed, e.g. for the change from -0.8 to -0.6° from laminar to transitional, so after the time of about 30 min the transition was perfect. This time is needed to achieve a new internal thermal balance of the plate and transition in thermal boundary is established.

Słowa kluczowe

EN

convective heat transfer; laminar-turbulent transition; thermal boundary layer

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2003
• Tom: nr 114
• Strony: 237--252
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Wierciński Z.

• Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

autor

Kaiser M.

• Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

Bibliografia

• [1] Dyban, E. P., Epik, E. Ya.: Heat Transfer and Hydrodynamics of the Turbulent Flow, Naukova Dumka, Kiev 1985.
• [2] Schetz J. A., Fuhs A. E.: Handbook of Fluid Dynamics and Fluid Machinery. Wiley & Sons, NY 1996.
• [3] Schlichting H., Gersten K.: Boundary Layer Theory, Springer-Verlag, Berlir. 1997 (in German).
• [4] Wierciński Z.: Turbulence inception in the induced by wakes boundary layer of a flot plate, Turbomachinery, Łódź, No. 119, 1999, 421-430.
• [5] Wierciński Z.: Laminar-turbulent transition in the boundary layer inducec by wakes, Buli. IFFM, No. 1450/99, Gdańsk 1999, (in Polish).