0
Research Papers: Jets, Wakes, and Impingement Cooling

Experimental and Numerical Investigation of Heat Transfer Characteristics of Inline and Staggered Arrays of Impinging Jets

[+] Author and Article Information
Yunfei Xing1

Institut für Thermodynamik der Luft- und Raumfahrt (ITLR), Universität Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germanyyunfei.xing@itlr.uni-stuttgart.de

Sebastian Spring, Bernhard Weigand

Institut für Thermodynamik der Luft- und Raumfahrt (ITLR), Universität Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany

1

Corresponding author.

J. Heat Transfer 132(9), 092201 (Jun 30, 2010) (11 pages) doi:10.1115/1.4001633 History: Received October 21, 2009; Revised February 25, 2010; Published June 30, 2010; Online June 30, 2010

A combined experimental and numerical investigation of the heat transfer characteristics within an array of impinging jets has been conducted. The experiments were carried out in a perspex model using a transient liquid crystal method. Local jet temperatures were measured at several positions on the impingement plate to account for an exact evaluation of the heat transfer coefficient. The effects of the variation in different impingement patterns, jet-to-plate spacing, crossflow schemes, and jet Reynolds number on the distribution of the local Nusselt number and the related pressure loss were investigated experimentally. In addition to the measurements, a numerical investigation was conducted. The motivation was to evaluate whether computational fluid dynamics (CFD) can be used as an engineering design tool in the optimization of multijet impingement configurations. This required, as a first step, a validation of the numerical results. For the present configuration, this was achieved assessing the degree of accuracy to which the measured heat transfer rates could be computed. The overall agreement was very good and even local heat transfer coefficients were predicted at high accuracy. The numerical investigation showed that state-of-the-art CFD codes can be used as suitable means in the thermal design process of such configurations.

Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Sketch of the experimental setup

Grahic Jump Location
Figure 2

The impingement model and positions of static pressure taps

Grahic Jump Location
Figure 3

Impingement patterns and the positions of thermocouples

Grahic Jump Location
Figure 4

View of the detailed position of thermocouple

Grahic Jump Location
Figure 5

Crossflow schemes

Grahic Jump Location
Figure 6

Measured temperature evolution of thermocouples

Grahic Jump Location
Figure 7

Three-dimensional view on the hexahedral mesh used for the maximum crossflow cases (left) compared with the original volume of the experimental facility (right)

Grahic Jump Location
Figure 8

Local GCI distribution for target plate centerline results on the fine grid

Grahic Jump Location
Figure 9

Spanwise averaged Nusselt number ratios on the target plate (inline pattern, different Reynolds number, H/d=4, and maximum crossflow scheme)

Grahic Jump Location
Figure 10

Spanwise averaged Nusselt number distributions (inline and staggered patterns, Re=35,000, H/d=3, 4, and 5, and different crossflow schemes)

Grahic Jump Location
Figure 11

Spanwise averaged Nusselt number distributions on the target plate (inline pattern, Re=35,000, H/d=3, and different crossflow schemes)

Grahic Jump Location
Figure 12

Comparison of target plate Nusselt number distributions from experiments and CFD (inline pattern, Re=35,000, H/d=3, and different crossflow schemes)

Grahic Jump Location
Figure 13

Position of the line used for the evaluation of local heat transfer coefficients

Grahic Jump Location
Figure 14

Comparison of local Nusselt number distributions from experiments and CFD (centerline results, inline pattern, Re=35,000, H/d=3, and different crossflow schemes)

Grahic Jump Location
Figure 15

Comparison to literature for the maximum crossflow scheme

Grahic Jump Location
Figure 16

Discharge coefficients of the impingement plate and exit rims for different arrangements

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In