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International Heat Transfer Conference 8

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

INFLUENCE OF ORGANIC POLYMER ADDITION ON THE STABILITY OF FILM BOILING IN THE CASE OF QUENCHING IN SUBCOOLED WATER

F. Moreaux
Laboratoire de Metallurgie associé au C.N.R.S. (LA. 159), Institut National Polytechnique de Lorraine, Ecole des Mines, 54042 Nancy Cedex, France

G. Beck
Laboratoire de Metallurgie associé au C.N.R.S. (LA. 159), Institut National Polytechnique de Lorraine, Ecole des Mines Pare de Saurupt, 54042 Nancy Cedex France

Abstract

When a silver cylinder is quenched from 850°C in a subcooled liquid, film boiling takes place randomly. Accordingly, the cooling law recorded versus time in the center of the cylinder is not reproductible. A velocity controlled injection of cold liquid close to the vapor-liquid interface, leads to the destabilization of the film boiling.
Depending upon the temperatures of the solid and the liquid, the velocity necessary to destabilize the film boiling ranges from 0.1 to 5 m/s. In this study the influence of these three parameters is shown and allows us to establish stability diagrams of film boiling.
The stability diagram for water is modified by the type of polymer and its concentration. The mechanisms of film boiling destabi1ization are studied and we point out that there is effectively a wetting of the solid by the liquid after destabilization and an increase of the local pressure in the liquid.
This fondamental study led us to improve aqueous solutions of organic polymer for the quenching of steels and aluminium alloys.

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