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International Heat Transfer Conference 12

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

Unsteady heat transfer in separated flow behind a circular cylinder

Hajime Nakamura
Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan

Tamotsu Igarashi
Department of Mechanical Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan

DOI: 10.1615/IHTC12.1490
6 pages

Abstract

An experimental study was carried out to investigate the unsteady heat transfer from a circular cylinder in cross flow at Re ~ 2 × 104. In the separated flow region, the intensity of the fluctuation of the local heat transfer was very high, the r.m.s. value was about a half of the time-averaged value. From the simultaneous measurements of both fluctuating flow and heat transfer, it was confirmed that the instantaneous heat transfer around the rear stagnation of the cylinder was enhanced by the flow reattachment, which was caused by the rolling-up of the shear layers separated from the cylinder. The instantaneous distribution of the heat transfer in the separated flow region showed three-dimensional characteristics. It fluctuated complicatedly due to the complex flow structure in the vicinity of the cylinder surface.

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