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Research Papers: Forced Convection

Experimental Investigation of the Flow and Heat Transfer in a Helically Corrugated Cooling Channel

[+] Author and Article Information
Ignacio Mayo

Mem. ASME
Jacques Chauvin Laboratory,
Turbomachinery & Propulsion Department,
von Karman Institute for Fluid Dynamics,
Chaussée de Waterloo 72,
Rhode-Saint-Genèse 1640, Belgium
e-mails: ignacio.mayo.yague@vki.ac.be;
mayo@rolls-royce.com

Bogdan C. Cernat

Mem. ASME
Jacques Chauvin Laboratory,
Turbomachinery & Propulsion Department,
von Karman Institute for Fluid Dynamics,
Chaussée de Waterloo 72,
Rhode-Saint-Genèse 1640, Belgium
e-mail: bogdan.cezar.cernat@vki.ac.be

Marco Virgilio

Jacques Chauvin Laboratory,
Turbomachinery & Propulsion Department,
von Karman Institute for Fluid Dynamics,
Chaussée de Waterloo 72,
Rhode-Saint-Genèse 1640, Belgium
e-mail: marco.virgilio@vki.ac.be

Alessio Pappa

Jacques Chauvin Laboratory,
Turbomachinery & Propulsion Department,
von Karman Institute for Fluid Dynamics,
Chaussée de Waterloo 72,
Rhode-Saint-Genèse 1640, Belgium
e-mail: alessio.pappa@outlook.com

Tony Arts

Mem. ASME
Jacques Chauvin Laboratory,
Turbomachinery & Propulsion Department,
von Karman Institute for Fluid Dynamics,
Chaussée de Waterloo 72,
Rhode-Saint-Genèse 1640, Belgium
e-mail: arts@vki.ac.be

1Present address: Rolls-Royce PLC, Derby DE24 8BJ, UK.

2Present address: Thermal Engineering and Combustion Unit, Université de Mons, Mons 7000, Belgium.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 18, 2017; final manuscript received February 15, 2018; published online March 30, 2018. Assoc. Editor: Yuwen Zhang.

J. Heat Transfer 140(7), 071702 (Mar 30, 2018) (9 pages) Paper No: HT-17-1354; doi: 10.1115/1.4039419 History: Received June 18, 2017; Revised February 15, 2018

The detailed flow field and heat transfer were experimentally investigated in a channel with a circular cross section and equipped with a helical rib of low blockage ratio. Stereoscopic particle image velocimetry (S-PIV) was applied in order to measure the three components of the mean and turbulent velocities in the symmetry plane of the channel. Additionally, steady-state liquid crystal thermography (LCT) and infrared thermography were employed in order to study the convective heat transfer coefficient on the wall. Measurements were carried out more than six pitches downstream of the rib origin, presenting periodic velocity and heat transfer fields from this location on. The resulting velocity and heat transfer fields show similarities with those present in channels of plane walls, such as low momentum and heat transfer areas upstream and downstream of the obstacle, and high kinetic energy and heat transfer a few rib heights downstream of the obstacle. On the other hand, the shape of the rib induces a swirling motion with the same sense as the rib. The azimuthal mean velocity is negligible in the core of the pipe, but it increases considerably close to the wall.

Copyright © 2018 by ASME
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References

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Figures

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Fig. 4

Liquid crystal thermography experimental setup

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Fig. 3

Schematic representation of the PIV instrumentation

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Fig. 2

Measurement plane locations (units given in millimeters)

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Fig. 1

Stereoscopic particle image velocimetry experimental setup

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Fig. 5

Layers on the acrylic glass internal face

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Fig. 6

Thermo-chromic liquid crystal calibration setup

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Fig. 7

Thermo-chromic liquid crystal calibration curve

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Fig. 8

Streamwise mean velocity and turbulent velocity profiles at the test section inlet

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Fig. 10

Azimuthal velocity contour

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Fig. 9

Mean in-plane streamlines and in-plane velocity contour

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Fig. 11

Streamwise turbulent velocity contour

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Fig. 12

Mean streamwise velocity (a) and turbulent velocity (b) profiles in planes A and B

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Fig. 13

Flow field representation

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Fig. 14

Enhancement factor contours

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Fig. 15

Combination of the flow field and heat transfer data: turbulent kinetic energy contour and heat transfer EF on the wall

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