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NUMERICAL STUDY OF TURBULENT FLOW AND HEAT TRANSFER IN A ROTOR-STATOR SYSTEM

DOI: 10.1615/ICHMT.2008.CHT.880
16 pages

Rachid Boutarfa
Laboratoire de Mécanique de Settat, Faculté des Sciences et Techniques de Settat, Route de Casablanca, BP 577, Settat - Maroc

Julien Pelle
Université de Valenciennes et du Hainaut-Cambrésis, TEMPO

Abstract

This work deals with a numerical and experimental study of turbulent flow and heat transfer in an unconfined rotor-stator system air gap. The rotor surface is cooled by the flow induced by the rotation of the disc. The stator is considered isothermal. The experimental technique uses infrared thermography to measure the surface temperatures of the rotor and the numerical solution of the steady state heat equation to determine the local heat transfer coefficient and the local and mean Nusselt number on the rotor surface. These numerical simulations are carried out using the fluent code. The k-εRNG turbulence model is used to predict the flow structure and heat transfers. The numerical results for the Nusselt number and velocity fields are compared with experimental results for rotational Reynolds numbers ranging from 6.7·105 to 8.8·105 and gap ratios ranging from 0.02 to 0.06. Analysis of the numerical and experimental results has determined the influence of the rotational Reynolds, the gap ratio and the system geometry on the flow structure and the convective exchanges in the gap between two discs. A good agreement between two approaches was obtained. The Model used for numerical approach is then validated for a turbulent flow in the gap between the rotor and the stator.

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