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International Heat Transfer Conference 10

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

Heat 'Transfer on the Surface of a Cylinder Rotating in an Annulus at High Axial and Rotational Reynolds Numbers

Peter R. N. Childs
Imperial College London

A. B. Turner
Thermo-Fluid Mechanics Research Centre, University of Sussex, Falmer, BN1 9QT, U.K.

DOI: 10.1615/IHTC10.990
pages 13-18

Abstract

Results from an extensive experimental programme are presented for rotor drum surface heat transfer in an annulus. The results are applicable to turbomachinery rotors, drums and electric motors and generators. An axial throughflow of air in the annulus was achieved using a downstream blower acting in suction giving axial Reynolds numbers (Re = ρVzDh) up to 3·7 × 105. The rotor, of diameter 400mm, was spun at speeds up to 10000rpm, giving rotational Reynolds numbers (Reø = ρωri2) up to 3 × 106. The surface heat transfer was measured using heat flux meters and thermocouples inlayed in to the surface. In addition a finite element thermal analysis of the experimental rig was undertaken as further validification of the results. A correlation is presented for the Nusselt number as a function of axial and rotational speed.

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