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Advances in Heat Transfer Engineering

ISSN:
1-56700-198-1 (Print)

HEAT TRANSFER ASPECTS OF BYPASS LAMINAR-TURBULENT TRANSITIONS

Eleonora Ya. Epik
Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine (IET NASU), 2a Zhelyabov Str., 03057, Kyiv, Ukraine

Abstract

The results of experimental investigation of heat transfer are presented for two cases of bypass laminar-turbulent transition initiated by increased turbulence Tue and both Tue and separation near the leading edge of streamlined surface. The special attention is paid to peculiarities of preceding to transition the pseudolaminar boundary layer with increased heat transfer coefficients what causes the formation of upper transition in case of combined influence of Tue and separation. The some aspects of mechanism of prevailing intensification of heal transfer in pseudolaminar boundary layer in comparison with friction are explained on the basis of correlations between velocity and temperature fluctuations and location of its maxima.