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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

Heat Transfer in a Perpendicular Arrangement of Cylinders in Steady and Pulsating Crossflow

Get access (open in a dialog) DOI: 10.1615/IHTC8.460
pages 1029-1034

Résumé

An experimental Investigation was conducted to measure the heat transfer from a cylinder In crossflow with three cylinders placed upstream and perpendicular to the test cylinder. All of the cylinders were the same diameter so that the turbulent length scales of the flow disturbances from the upstream cylinders were the same order of size as the cylinder diameter. The time-averaged heat transfer was measured from segments of the cylinder with both steady and pulsating air flow. The range of pulsation frequencies included both the natural shedding frequency and the frequency range of much of the turbulence. The heat transfer results were compared with the second cylinder of a tandem arrangement of cylinders and a single cylinder. For large spacings (L/D > 3.0) the perpendicular arrangement had higher heat transfer than the tandem arrangement. The transfer was less for smaller spacings (L/D < 3.0). In all cases transfer was much higher than for a single cylinder. Pulsing the flow for the perpendicular arrangement Increased overall heat transfer by up to 10 percent. The Increase occurred on the back of the cylinder, and for L/D < 2.5 was larger than the pulsation Increase for a single cylinder. Moreover, the organized vortex shedding, which is characteristic of crossflow over cylinders, was suppressed by the perpendicular arrangement.