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International Heat Transfer Conference 5

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

FORCED CONVECTION HEAT TRANSFER IN THE TRANSITION FROM LAMINAR TO TURBULENT FLOW IN CLOSELY SPACED CIRCULAR TUBE BUNDLES

W. Panknin
Institut fur Verfahrenstechnik, T.U. Hannover, Germany

M. Jahn
Institut fur Verfahrenstechnik, T.U. Hannover, Germany

H.-H. Reineke
Institut fur Verfahrenstechnik Technical University of Hannover, Germany

DOI: 10.1615/IHTC5.2300
pages 325-329

Abstrakt

Distributions of heat transfer coefficients in axial heat exchangers, consisting of closely spaced tube bundles, were measured with a holographic interferometer. For the transition from laminar to turbulent flow (Re 500 − 5000) six different spacings were examined. In addition to the local differences, temporal variations could be observed. A theoretical calculation of the local heat transfer, using the finite difference method, is in good agreement with the experimental results.

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