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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

DROPLET VAPORISATION IN A CONFINED BURNING JET

Get access (open in a dialog) DOI: 10.1615/IHTC6.1940
pages 7-12

Résumé

The droplet heating and vaporization, which takes place in a jet, created by an air blast burner operated in a tunnel, firing into a small furnace, is investigated theoretically and experimentally. In the experiments air and fuel flow rates, wall and gas temperatures, combustion product composition and droplet size are measured. In the analysis the relative importance of radiation from the tunnel walls and from the flame and of convection is estimated. The conduction, which is important within a single droplet, can be neglected in the initial heating of the mixture. A comparison between radiative and convective heat transfer is carried out under appropriate assumptions and it is shown that under the present conditions, the influence of convection is dominant. Indeed, according to the calculations, radiation dominated droplet evaporation should exhibit strong dependence on tunnel temperature and a weak effect of the initial droplet diameter. The experiments show that this is not the case and, therefore, confirm the dominant role of the convective heat transfer.