Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 5
September, 3-7, 1974, Tokyo, Japan

CONVECTIVE HEAT TRANSFER FROM A ROTATING DISC IN A TRANSVERSE AIR STREAM

Get access (open in a dialog) DOI: 10.1615/IHTC5.1700
pages 30-34

Abstrakt

Radial variation of heat transfer coefficient is reported for a disc rotating at speeds up to 1650 r.p.m. in still air and in transverse air streams of speeds up to 33 m/s. A sensor for local heat transfer coefficient, with thermistors as heating elements, is described. The size of the coefficient is governed by the main air stream, the rotating boundary layer on the disc giving small perturbations. Experiments with discs of different aspect ratios (simulated by the test disc protruding from a shroud) show the radial variations can be explained in terms of flow separation at the disc leading edge followed by reattachment to the face. At large aspect ratio the heat transfer coefficient increases with radius but at smaller aspect ratio it passes through a maximum.