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Experimental Analysis of the Nusselt Number for Jet Impingement on a Flat Plate

[+] Author Affiliations
Gerardo Carbajal

Universidad del Turabo, Gurabo, Puerto Rico

G. P. Peterson

Georgia Institute of Technology, Atlanta, GA

C. B. Sobhan

National Institute of Technology, Calicut, India

Paper No. IMECE2009-11991, pp. 1917-1922; 6 pages
doi:10.1115/IMECE2009-11991
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

An experimental analysis was performed to calculate the local Nusselt number associated with the impingement of a jet of hot gases on a steel flat plate. A plate was subjected to a constant-rate propane torch, with a measured average temperature of the hot gases at approximately 896 °C. The jet was applied to the flat plate at different angles of 45, 60, 75 and 90 degrees. The jet was horizontally located at 0.044m away from the flat plate and experiments were performed with two different vertical distances. The temperature distribution on the front and back sides of the plate were recorded by using 20 thermocouples. The plate reached steady-state conditions after 4100 seconds. The unheated side was cooled by combined natural convection and radiative effects. To perform the experiment, the steel plate was mounted on a tubular apparatus that holds the plate vertically, with a provision to change the angle of impingement. It was found that the combined effects of tilt angle and vertical switch reduce the local Nusselt number, by 51% for a tilt angle equal to 45 degrees. The maximum heat flux at the center of the plate was found to be 15.5 kW/m2 .

Copyright © 2009 by ASME

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