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Application of Pressure and Temperature Sensitive Paints for Study of Heat Transfer to a Circular Impinging Air Jet

[+] Author Affiliations
Quan Liu, A. K. Sleiti, J. S. Kapat

University of Central Florida

Paper No. IMECE2005-79214, pp. 437-446; 10 pages
doi:10.1115/IMECE2005-79214
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part A
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4221-5 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Experimental and computational studies are performed to study pressure and temperature distributions and flow patterns on impingement target surface subject to a single impinging air jet from a plenum. The experiments cover a range of jet-to- target plate distance, Z/D, from 1.5 to 12 for Reynolds number range from 5000 to 60000. The main objective is to investigate the optimal jet-to-target distance (Z/D) for stagnation point heat transfer and location of second peak of local heat transfer at small Z/D value of 1.5. Pressure and temperature sensitive paints measurements techniques are implemented to obtain the distribution of pressure and temperature on target surface. Flow visualization test has also been performed using surface oil and smoke technique to obtain the streamline distribution over the impinged surface and to qualitative study jet characteristics. The optimal (Z/D) is found to be 4.8 and second peak location for Z/D of 1.5 is at radial location (r/D) of 1.8. Comparison of average Nu with correlation from open literature, shows agreement to within experimental uncertainty for Z/D=5, while for Z/D=1.5 a 23% difference is found. Experimental results are compared to computational (CFD) prediction using Realizable κ-ε turbulence model.

Copyright © 2005 by ASME

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