Effect of Nozzle—Surface Separation Distance on Impingement Heat Transfer for a Jet in a Crossflow

[+] Author and Article Information
E. M. Sparrow, R. J. Goldstein, M. A. Rouf

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn.

J. Heat Transfer 97(4), 528-533 (Nov 01, 1975) (6 pages) doi:10.1115/1.3450423 History: Received March 06, 1975; Online August 11, 2010


Measurements were made of the local heat transfer coefficients resulting from the impingement of a turbulent jet which interacts with a crossflow. The experiments were performed for separation distances between the exit of the jet nozzle and the impingement surface ranging from 3 to 12 times the jet exit diameter. The ratio of jet to crossflow mass velocity was varied from 4 to 12. To evaluate the heat transfer coefficients, local recovery temperatures were also measured. The results for the larger mass velocity ratios indicated that as the separation distance is varied, the impingement point heat transfer coefficient attains a maximum when the separation distance is 5–6 times the jet diameter. On the other hand, at a smaller mass velocity ratio such as 4, the maximum is attained at a substantially smaller separation distance. Experiments were also performed to examine how the transfer coefficients are affected by the presence or absence of a simulated duct wall at the exit of the jet nozzle. The differences between the results for the two configurations were confined to dimensionless separation distances greater than 4, with the largest effects at low mass velocity ratios.

Copyright © 1975 by ASME
Your Session has timed out. Please sign back in to continue.





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