PRELIMINARY STUDY ON THE FILM BOILING BEHAVIOR OF WATER AND SODIUM CARBONATE SOLUTIONS DROPLETS ON A STAINLESS-STEEL SURFACE

PRELIMINARY STUDY ON THE FILM BOILING BEHAVIOR OF WATER AND SODIUM CARBONATE SOLUTIONS DROPLETS ON A STAINLESS-STEEL SURFACE

CRUZ, V.M.V.; JIN, E.

Artigo Completo:

Film boiling is a critical phenomenon in vapor explosion backed by many studies in literature; however, film boiling behavior is not studied in the context of sodium salt solutions and its behavior in different parameters. Experiments were conducted by dropping a droplet with different sodium carbonate (Na2CO3) concentrations on a hot surface and the measurement of the time of vaporization. This research aimed to investigate the effect of two different parameters, the variation in salt concentration and temperature, on film boiling behavior. The method used provided an understanding of the phenomenon, as well as comparative boiling curves based on the droplet lifetime using image analysis. The salt addition developed a thinner unstable film during boiling in high temperatures, as the salt lowers the vapor pressure of water, it reduced the repulsive forces between the hot surface and the droplet, and increasing the rate of heat transfer.

Film boiling is a critical phenomenon in vapor explosion backed by many studies in literature; however, film boiling behavior is not studied in the context of sodium salt solutions and its behavior in different parameters. Experiments were conducted by dropping a droplet with different sodium carbonate (Na2CO3) concentrations on a hot surface and the measurement of the time of vaporization. This research aimed to investigate the effect of two different parameters, the variation in salt concentration and temperature, on film boiling behavior. The method used provided an understanding of the phenomenon, as well as comparative boiling curves based on the droplet lifetime using image analysis. The salt addition developed a thinner unstable film during boiling in high temperatures, as the salt lowers the vapor pressure of water, it reduced the repulsive forces between the hot surface and the droplet, and increasing the rate of heat transfer.

Palavras-chave:

DOI: 10.5151/chemeng-cobeqic2017-503

Referências bibliográficas

• [1] INCROPERA, F.; DEWITT, D.; BERGMAN, T.; LAVINE, A. Fundamentos de
• [2] Transferência de Calor e Massa, 6ª edição, LTC, p. 395-400, 2011.
• [3] HALLIDAY, RESNICK e WALKER. Fundamentos de Física, 4 ed., v. 2, p. 203/205. Rio de Janeiro: LTC, 1996.
• [4] BERNARDIN, J. D.; MUDAWAR, I. The Leidenfrost Point: Experimental Study and Assessment of Existing Models. Journal of Heat Transfer., v. 121, p. 894-903, 1999.

Como citar:

CRUZ, V.M.V.; JIN, E.; "PRELIMINARY STUDY ON THE FILM BOILING BEHAVIOR OF WATER AND SODIUM CARBONATE SOLUTIONS DROPLETS ON A STAINLESS-STEEL SURFACE", p-3139-3144. In: Anais do XII Congresso Brasileiro de Engenharia Química em Iniciação Científica [=Blucher Chemical Engineering Proceedings, v. 1, n.4]. ISSN Impresso: 2446-8711. São Paulo: Blucher, 2017.
ISSN 23591757, DOI 10.5151/chemeng-cobeqic2017-503