Heat transfer study in a discoidal system: The influence of rotation and space between disks |
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Authors: | Julien Pellé Souad Harmand |
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Affiliation: | 1. Laboratoire de Physique des Surfaces et des Interfaces, Université de Mons, Av. Maistriau, 19, B-7000 Mons, Belgium;2. Università di Pisa - DESTEC, Largo L. Lazzarino, 1, 56122, Pisa, Italy;3. Department of Engineering, University of Bergamo, Viale Marconi 5, 24044 Dalmine, Italy |
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Abstract: | This article presents an experimental study of the local heat transfer on the rotor surface in a discoidal rotor–stator system air-gap in which an air jet comes through the stator and impinges the rotor. To determine the surface temperatures, measurements were taken on the rotor, using an experimental technique based on infrared thermography. A thermal balance was used to identify the local convective heat transfer coefficient. The influence of the dimensionless spacing interval G between the disks and of the rotational Reynolds number Re was measured and compared with the data available in bibliography. Local convective heat transfer coefficients were obtained for an axial Reynolds number Rej = 41.6 × 103, a rotational Reynolds number Re between 0.2 × 105 and 5.16 × 105, and a dimensionless spacing interval G ranging from 0.01 to 0.16. |
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