ISSN Online: 2377-424X
International Heat Transfer Conference 5
STUDY OF MECHANISM OF BURN-OUT IN A HIGH HEAT-FLUX BOILING SYSTEM WITH AN IMPINGING JET
Resumo
Nucleate boiling at very high heat fluxes was created on a heated surface covered with a flowing film of saturated water at atmospheric pressure being maintained by a small circular jet of water held at the center of the heated surface. It was found that increasing the heat flux leaded to a limiting state of flow where the splashing of droplets from the heated surface was no longer increased being kept constant till the burn-out appeared; and that there was a close relation between the burn-out heat flux and the jet velocity. A flow model, which can explain characteristics of this boiling system, is proposed, and it is suggested that the burn-out may be connected with the separation of a liquid flow from the heated surface accompanied with the effusion of vapor.