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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015011198
pages 119-140

JET ARRAY IMPINGEMENT COOLING LOCAL NUSSELT NUMBER VARIATIONS: EFFECTS OF HOLE ARRAY SPACING, JET-TO-TARGET PLATE DISTANCE, AND REYNOLDS NUMBER

Mary Jennerjohn
Parks College of Engineering, Aviation, and Technology, Saint Louis University, St. Louis, MO 63103 USA
Junsik Lee
Parks College of Engineering, Aviation, and Technology, Saint Louis University, St. Louis, MO 63103 USA; Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Deajeon, 305-343, KOREA
Zhong Ren
Parks College of Engineering, Aviation, and Technology, Saint Louis University, St. Louis, MO 63103 USA; Propulsion Research Center, Department of Mechanical and Aerospace Engineering, College of Engineering, University of Alabama in Huntsville, 5000 Technology Boulevard, Olin B. King Technology Hall S236, Huntsville, AL 35899, USA
Phillip Ligrani
Propulsion Research Center, Department of Mechanical and Aerospace Engineering, 5000 Technology Drive, Olin B. King Technology Hall S236, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA
Mark McQuilling
Parks College of Engineering, Aviation, and Technology, Saint Louis University, St. Louis, MO 63103 USA
Michael D. Fox
University of Washington, Seattle, WA 98195; Aero/Thermal & Heat Transfer, Solar Turbines, Inc., San Diego, California 92186-5376 USA
Hee-Koo Moon
Aero/Thermal & Heat Transfer, Solar Turbines, Inc., San Diego, California 92186-5376 USA

RÉSUMÉ

Discussed in the article are the combined and separate effects of hole array spacing, jet-to-target plate distance, and Reynolds number on the local surface heat transfer rate for an impinging jet array. The array of impinging jets is directed to one flat surface of a channel which is bounded on three sides. Considered are the Reynolds numbers ranging from 8000 to 50,000, jet-to-target plate distances of 1.5D, 3.0D, 5.0D, and 8.0D, and the streamwise and spanwise hole spacing of 5D, 8D, and 12D, where D is the impingement hole diameter. Also included is a conduction analysis of the impingement cooling array target surface. In general, the local Nusselt numbers generally increase at each x/D location as either the Reynolds number increases, or as the X/D = Y/D hole spacing decreases. The highest Nusselt numbers are generally present at Z/D = 3.0 for Rej values of 8200, 20,000, and 30,000. When Rej = 52,000, the highest measured Nusselt number values are generally present for Z/D of either 1.5, 3.0, or 5.0, depending on the magnitudes of Rej, X/D, Y/D, and streamwise location x/D. The cumulative accumulations of crossflows, from sequential rows of jets, result in sequentially decreasing periodic Nusselt number variations with streamwise development. When examined at a particular value of Rej, the streamwise locations of the local maximum Nusselt numbers also shift to larger x/D locations as Z/D, the normalized jet-to-target distance, increases. The overall result is a complex dependence of local Nusselt numbers on the hole array spacing, jet-to-target plate distance, and impingement jet Reynolds number.