Local convective heat transfer to submerged pulsating jets
Book
·
OSTI ID:419631
- Clemson Univ., SC (United States)
An experimental investigation was carried out to study the effect of flow pulsations on the heat transfer characteristics of a planar air jet. A surface-mounted microsensor provided localized and essentially instantaneous heat flux and temperature signals. Heat transfer and thermal anemometry flow measurements were synchronized in order to associate influences of periodic flow structures and pulsations on heat transfer. Experiments were performed at jet Reynolds numbers of 1000, 5500, and 11000. Pulsation frequencies ranged from 0 Hz to 80 Hz, corresponding to Strouhal numbers below 0.106 based on nozzle width and jet discharge velocity. The pulse amplitude at the nozzle exit was varied from 0% to 50% of the mean flow velocity. Both instantaneous and time-averaged heat transfer distributions are presented. In comparison to steady jets, Nusselt numbers in the nozzle midplane increased by up to 12% and by up to 80% at distances downstream.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 419631
- Report Number(s):
- CONF-960815--; ISBN 0-7918-1512-9
- Country of Publication:
- United States
- Language:
- English
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