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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

EFFECT OF ULTRASONIC EMISSION ON BOILING AND NON-BOILING HEAT TRANSFER IN NATURAL AND FORCED CIRCULATION SYSTEMS

Get access (open in a dialog) DOI: 10.1615/IHTC10.2380
pages 97-102

Resumo

The present study was undertaken to clarify the effects and mechanisms of the ultrasonic waves on boiling and non-boiling heat transfer in natural and forced circulation systems. Experiments were conducted in non-boiling convection, nucleate boiling and film boiling regions. The results indicated a significant increase in heat transfer rate caused by an application of the ultrasonic waves both in single-phase convective and film boiling regions, whereas heat transfer was not so much enhanced in nucleate boiling, particularly at high heat fluxes with low liquid subcoolings. The primary mechanism to increase heat transfer rate has been made clear to be a highly improved convective heat transfer caused by acoustic streams.