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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER IN A TURBULENT BOUNDARY LAYER BEHIND A TWO-DIMENSIONAL BLUFF BODY AT DIFFERENT Pr NUMBERS

Algirdas Zukauskas
Lithuanian Academy of Sciences, Vilnius, Lithuania

Anupras Slanciauskas
Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kuanas, Lithuania

Antanas Pedisius
Lithuanian Energy Institute, Siluminø árenginiø tyrimo ir bandymø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

Abstract

Measurements downstream of an obstacle in fluids of different Pr suggest that maximum disturbances in the sublayer do not coincide with maximum turbulence in the shear layer along the reattachment region. Unlike the case of Pr = 1, for higher obstacles and Pr >> l, an upstream shift of the maximum heat transfer is observed. The length of the separation region l reflects the intensity of reattachment. With a reference to this, Nul ~ Rel·R0−0.2 for Pr = 1. In the region of redevelopment, there exist two distinct stages of return to the ordinary heat transfer, with a significant effect of the turbulence memory. In the first stage of relaxation L = 0.4x. A neglect of the memory effect leads to overestimated values of the turbulent Prandtl number.

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