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Research Papers: Forced Convection

Convective Heat Transfer in a Rotor–Stator System Airgap With a Centered Natural Suction of Fluid

[+] Author and Article Information
Julien Pellé1

 Université de Lille Nord de France, F-59000 Lille, France; UVHC, TEMPO/DF2T, F-59313 Valenciennes, Francejulien.pelle@univ-valenciennes.fr

Souad Harmand

 Université de Lille Nord de France, F-59000 Lille, France; UVHC, TEMPO/DF2T, F-59313 Valenciennes, Francejulien.pelle@univ-valenciennes.fr

1

Corresponding author.

J. Heat Transfer 133(11), 111702 (Sep 19, 2011) (9 pages) doi:10.1115/1.4004344 History: Received October 22, 2010; Revised May 30, 2011; Published September 19, 2011; Online September 19, 2011

The present work relates to an experimental study of the local convective heat transfer over the rotor surface in the air-gap of a discoidal rotor–stator system. This configuration is of interest namely, in electrical machines or tubomachinery. Following precedent studies obtained for a single rotating disk or a closed (but unshrouded) rotor–stator system, an air suction comes through the stator and enters the air-gap in this particular work. Determination of Nusselt numbers is based on the use of infrared thermography. The influence of the suction is discussed for an interdisk dimensionless spacing interval, G ranging from 0.01 to 0.16 and for a rotational Reynolds number, Re between 30,000 and 5,16,000. Results shows that the suction could locally provide better cooling than in the closed rotor–stator and in the single disk configurations, even if the main influence is a decrease in the convective heat transfer.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental set-up

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Figure 2

Mean Nusselt numbers with both hole diameters

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Figure 3

Mean Nusselt numbers for the different cases: (a) Re = 1,29,000; (b) Re = 2,58,000; (c) Re = 3,87,000; and (d) Re = 5,16,000

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Figure 4

Local Nusselt numbers for G = 0.01. (a) d = 10 mm and (b) d = 26 mm

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Figure 5

Local Nusselt numbers for G = 0.04. (a) d = 10 mm and (b) d = 26 mm

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Figure 6

Local Nusselt numbers for G = 0.16. (a) d = 10 mm and (b) d = 26 mm

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Figure 7

Local Nusselt numbers for G = 0.01. (a) Re = 1,29,000; (b) Re = 2,58,000; (c) Re = 3,87,000; and (d) Re = 5,16,000.

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Figure 8

Local Nusselt numbers for G = 0.04. (a) Re = 1,29,000; (b) Re = 2,58,000; (c) Re = 3,87,000; and (d) Re = 5,16,000.

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Figure 9

Local Nusselt numbers for G = 0.16. (a) Re = 1,29,000; (b) Re = 2,58,000; (c) Re = 3,87,000; and (d) Re = 5,16,000.

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Figure 10

Heat transfer in the central area: (a) size of the area where opening is beneficial and (b) multiplication ratio of heat transfer in the central area

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