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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v31.i6-8.150
pages 484-492

Heat Transfer in Origination of an Upper Bypass Transition

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

ABSTRACT

The results of the study of heat transfer in by-pass laminar-to-turbulent transition (BLTT), arising in the presence of local separation on the leading edge of a flat plate with non-gradient streamlining at an elevated degree of turbulence Tue = 3.6−2.6% are presented. It is confirmed that an upper BLTT characterized by monotonic changes in the coefficients of heat transfer takes place under these conditions. BLTT of this type is diagnosed and its boundaries are determined on the basis of an analysis of distributions of coefficients of friction and heat transfer, velocity profiles, fluctuations and a formparameter. A scheme for calculation of heat transfer in the presence of BLTT that is based on use of turbulent viscosity on the outer edge of a dynamic boundary layer as a main criterion which determines intensity of heat transfer.


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