Heat Transfer Study in a Discoidal System: The Influence of an Impinging Jet and Rotation

Authors: Pellé, J.; Harmand, S.

Source: Experimental Heat Transfer, Volume 20, Number 4, October 2007 , pp. 337-358(22)

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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 axial Reynolds number Rej and the rotational Reynolds number Re was measured and compared with the data available in the literature. Local convective heat transfer coefficients were obtained for a dimensionless space between the two disks G = 0.01, for Rej between 0 and 41,666, and for Re between 20,000 and 516,000. The flow data found in the literature can be used to explain the heat transfers in this small space configuration. In fact, the rotating disk can be divided into two influence zones: one dominated by the air jet near the center of the rotor and one affected by both the air jet and rotation. Heat transfers with non zero impinging jets appear to be continuously improved compared to those with no jets, even if the two influence zones mentioned previously are situated differently.

Keywords: rotor-stator; infrared thermography; convective heat transfer; impinging jet

Document Type: Research article

DOI: http://dx.doi.org/10.1080/08916150701418351

Affiliations: 1: Laboratoire de Mécanique et Energétique, Université de Valenciennes et du Hainaut-Cambrésis, Valenciennes, France

Publication date: 2007-10-01

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