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TECHNICAL PAPERS

Experimental Investigation of the Flow Distribution Inside a Tubular Heat Exchanger

[+] Author and Article Information
Thierry M. Faure

Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur, Unité Propre de Recherche 3251, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Paris 6, B.P. 133, 91403 Orsay Cedex, Francethierry.faure@limsi.fr

François Lusseyran

Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur, Unité Propre de Recherche 3251, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Paris 6, B.P. 133, 91403 Orsay Cedex, Francefrancois.lusseyran@limsi.fr

Pierre Gougat

Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur, Unité Propre de Recherche 3251, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Paris 6, B.P. 133, 91403 Orsay Cedex, Francegougat@limsi.fr

François Launay

Institut de Physique Nucléaire d’Orsay, Unité Mixte de Recherche 8608, Centre National de la Recherche Scientifique, 15 rue Georges Clémenceau, 91406 Orsay Cedex, Francelaunayf@ipno.in2p3.fr

J. Fluids Eng 128(6), 1218-1227 (May 15, 2006) (10 pages) doi:10.1115/1.2353277 History: Received July 07, 2005; Revised May 15, 2006

The velocity field inside a new concept of heat exchanger, which is a component of a high protons linear accelerator, is investigated experimentally in order to validate the design. A full scale facility with optical accesses is used for the measurements by particle image velocimetry. The choice of the technique is set by the three-dimensional and strongly unsteady structure of the flow. A filtering procedure is applied to the recorded images before processing the velocity field with an optical flow algorithm using dynamical programming. The distribution of the velocity between the different tubes of the heat exchanger shows a large scatter of flow rate between these tubes. In addition, the turbulence characteristics are presented.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 6

Comparison between (a) the autocorrelation function of the rough image, (b) with mean background noise subtraction, (c) with an eroded-dilated noise image subtraction, and (d) with subtraction of images n and n+2

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Figure 2

View of the new heat exchanger model

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Figure 3

Heat exchanger model

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Figure 4

Laser emission head and its translation system

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Figure 5

Comparison between (a) a rough image, (b) an image with mean background noise subtraction, (c) with an eroded-dilated noise image subtraction, and (d) with subtraction of images n and n+2

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Figure 7

Comparison between the cross-correlation function of (a) a couple of rough images, (b) with mean background noise subtraction, (c) with an eroded-dilated noise image subtraction, and (d) with subtraction of images n and n+2

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Figure 8

Histogram of a rough image, with mean background noise subtraction and with subtraction of images n and n+2 (left) and cross-correlation at Δy=0 for a couple of the same images (right)

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Figure 9

Light path deformation caused by the different media

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Figure 10

Apparent radius function of the true radial position

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Figure 16

Variance of the radial velocity fluctuations for the inlet flow rate 12l∕min

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Figure 17

Shear stress of the axial-radial velocity fluctuations for the inlet flow rate 12l∕min

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Figure 11

Mean axial velocity distribution in the tubes for the inlet flow rate 12l∕min

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Figure 12

Radial evolution of the axial velocity for three axial positions inside the tubes and for the inlet flow rate 12l∕min

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Figure 13

Radial evolution of the radial velocity for three axial positions inside the tubes and for the inlet flow rate 12l∕min

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Figure 14

Averaged reference velocity Uq distribution inside the tubes for five inlet flow rates

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Figure 15

Variance of the axial velocity fluctuations for the inlet flow rate 12l∕min

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