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Jets, Wakes, and Impingment Cooling

An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs

[+] Author and Article Information
Sebastian Spring

Institute of Aerospace Thermodynamics (ITLR),  University of Stuttgart, Pfaffenwaldring 31, Stuttgart 70569, Germanysebastian.spring@itlr.uni-stuttgart.de

Yunfei Xing

Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Bernhard Weigand

Institute of Aerospace Thermodynamics (ITLR),  University of Stuttgart, Pfaffenwaldring 31, Stuttgart 70569, Germany

J. Heat Transfer 134(8), 082201 (May 29, 2012) (11 pages) doi:10.1115/1.4006155 History: Received March 04, 2011; Revised January 20, 2012; Published May 29, 2012; Online May 29, 2012

A combined experimental and numerical investigation of the heat transfer characteristics within arrays of impinging jets with rib-roughened surfaces is presented. Two configurations are considered: One with an inline arrangement of jets and ribs oriented perpendicular to the direction of cross-flow and one with a staggered arrangement of jets and broken ribs aligned with the direction of cross-flow. For both cases, the jet Reynolds number is 35,000, the separation distance measures H/D = 3, the spent air is routed through one exit contributing to the maximum cross-flow condition, and the rib height and width is both 1 D. The experiments are carried out in perspex models using the transient liquid crystal method. Local jet temperatures are measured at several positions on the impingement plate to account for an exact evaluation of the heat transfer coefficient. In addition to the measurements, a numerical analysis using the commercial CFD software package ANSYS CFX is conducted. Heat transfer predictions are compared with those obtained from experiments with regards to local distributions as well as averaged quantities. A good overall agreement is found but discrepancies for local values need to be accepted. The present investigation also emphasizes that configurations including rib roughness elements should be compared based on the amount of transferred heat flux in order to account for the area enlarging effect. This allows a correct evaluation of the thermal performance.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Three-dimensional schematic of the test rig

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Figure 2

Cross-sectional view through the impingement rig

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Figure 3

Schematic of configurations I

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Figure 4

Schematic of configurations II

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Figure 5

Schematic of computational domain and view on the mesh representing configuration I

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Figure 6

Calculated GCI error band for centerline Nusselt numbers on the fine grid of configuration I

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Figure 7

Comparison of Nusselt number contours for configuration I

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Figure 8

Comparison of centerline Nusselt number distributions for configuration I

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Figure 9

Comparison of spanwise-averaged Nusselt number distributions for configuration I

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Figure 10

Comparison of Nusselt number contours for configuration II

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Figure 11

Comparison of centerline Nusselt number distributions for configuration II

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Figure 12

Comparison of spanwise-averaged Nusselt number distributions for configuration II

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Figure 13

Row-wise averaged Nusselt number ratios for configurations I and II

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Figure 14

Row-wise averaged ratios of amount of transferred heat flux for configurations I and II

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Figure 15

Contribution of the individual surfaces to the total amount of transferred heat flux for configuration I and unribbed counterpart

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Figure 16

Contribution of the individual surfaces to the total amount of transferred heat flux for configuration II and unribbed counterpart

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